Record 1 of 209

Title: Broadband near-infrared emission in Tm<SUP>3+</SUP>-Dy<SUP>3+</SUP> codoped amorphous chalcohalide films fabricated by pulsed laser deposition

Author(s): Yang, SL (Yang, Senlin); Wang, XF (Wang, Xuefeng); Guo, HT (Guo, Haitao); Dong, GP (Dong, Guoping); Peng, B (Peng, Bo); Qiu, JR (Qiu, Jianrong); Zhang, R (Zhang, Rong); Shi, Y (Shi, Yi)

Source: OPTICS EXPRESS  Volume: 19  Issue: 27  Pages: 26529-26535  DOI: 10.1364/OE.19.026529  Published: DEC 19 2011  

Abstract: Structural and near-infrared (NIR) emission properties were investigated in the Tm3+-Dy3+ codoped Ge-Ga-based amorphous chalcohalide films fabricated by pulsed laser deposition. The homogeneous films illustrated similar random network to the glass target according to the measurements of X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. An 808 nm laser diode pumping generated a superbroadband NIR emission ranging from 1050 to 1570 nm and the other intense broadband NIR emission centered at similar to 1800 nm, which was attributed to the efficient energy transfer from Tm3+ to Dy3+ ions. This was further verified by the broad-range excitation measurements near the Urbach optical-absorption edge involved defect states. The results shed light on the potential highly integrated planar optical device applications of the codoped amorphous chalcohalide films. (C) 2011 Optical Society of America

Accession Number: WOS:000301151500067

PubMed ID: 22274237

Author Identifiers:

ISSN: 1094-4087

Record 2 of 209

Title: Reflective point-diffraction microscopic interferometer with long-term stability

Author(s): Guo, RL (Guo, Rongli); Yao, BL (Yao, Baoli); Gao, P (Gao, Peng); Min, JW (Min, Junwei); Zheng, JJ (Zheng, Juanjuan); Ye, T (Ye, Tong)

Source: CHINESE OPTICS LETTERS  Volume: 9  Issue: 12  Article Number: 120002  DOI: 10.3788/COL201109.120002  Published: DEC 10 2011  

Abstract: An on-axis phase-shifting reflective point-diffraction microscopic interferometer for quantitative phase microscopy based on Michelson architecture is proposed. A cube beamsplitter splits the object wave spectrum into two copies within two arms. Reference wave is rebuilt in one arm by low-pass filtering on the object wave frequency spectrum with a pinhole-mask mirror, and interferes with the object wave from the other arm. Polarization phase-shifting is performed and phase imaging on microscale specimens is implemented. The experimental results demonstrate that the proposed scheme has the advantage of long-term stability due to its quasi common-path geometry with full use of laser energy.

Accession Number: WOS:000298341700003

Author Identifiers:

ISSN: 1671-7694

Record 3 of 209

Title: Two-dimensional sub-half-wavelength atom localization via controlled spontaneous emission

Author(s): Wan, RG (Wan, Ren-Gang); Zhang, TY (Zhang, Tong-Yi)

Source: OPTICS EXPRESS  Volume: 19  Issue: 25  Pages: 25823-25832  DOI: 10.1364/OE.19.025823  Published: DEC 5 2011  

Abstract: We propose a scheme for two-dimensional (2D) atom localization based on the controlled spontaneous emission, in which the atom interacts with two orthogonal standing-wave fields. Due to the spatially dependent atom-field interaction, the position probability distribution of the atom can be directly determined by measuring the resulting spontaneously emission spectrum. The phase sensitive property of the atomic system leads to quenching of the spontaneous emission in some regions of the standing-waves, which significantly reduces the uncertainty in the position measurement of the atom. We find that the frequency measurement of the emitted light localizes the atom in half-wavelength domain. Especially the probability of finding the atom at a particular position can reach 100% when a photon with certain frequency is detected. By increasing the Rabi frequencies of the driving fields, such 2D sub-half-wavelength atom localization can acquire high spatial resolution. (C) 2011 Optical Society of America

Accession Number: WOS:000297702400099

PubMed ID: 22273975

ISSN: 1094-4087

Record 4 of 209

Title: Exploiting Local Coherent Patterns for Unsupervised Feature Ranking

Author(s): Huang, QH (Huang, Qinghua); Tao, DC (Tao, Dacheng); Li, XL (Li, Xuelong); Jin, LW (Jin, Lianwen); Wei, G (Wei, Gang)

Source: IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS  Volume: 41  Issue: 6  Pages: 1471-1482  DOI: 10.1109/TSMCB.2011.2151256  Published: DEC 2011  

Abstract: Prior to pattern recognition, feature selection is often used to identify relevant features and discard irrelevant ones for obtaining improved analysis results. In this paper, we aim to develop an unsupervised feature ranking algorithm that evaluates features using discovered local coherent patterns, which are known as biclusters. The biclusters (viewed as submatrices) are discovered from a data matrix. These submatrices are used for scoring relevant features from two aspects, i.e., the interdependence of features and the separability of instances. The features are thereby ranked with respect to their accumulated scores from the total discovered biclusters before the pattern classification. Experimental results show that this proposed method can yield comparable or even better performance in comparison with the well-known Fisher score, Laplacian score, and variance score using three UCI data sets, well improve the results of gene expression data analysis using gene ontology annotation, and finally demonstrate its advantage of unsupervised feature ranking for high-dimensional data.

Accession Number: WOS:000297342100003

PubMed ID: 21690016

Author Identifiers:

ISSN: 1083-4419

eISSN: 1941-0492

Record 5 of 209

Title: Enhanced Biologically Inspired Model for Object Recognition

Author(s): Huang, YZ (Huang, Yongzhen); Huang, KQ (Huang, Kaiqi); Tao, DC (Tao, Dacheng); Tan, TN (Tan, Tieniu); Li, XL (Li, Xuelong)

Source: IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS  Volume: 41  Issue: 6  Pages: 1668-1680  DOI: 10.1109/TSMCB.2011.2158418  Published: DEC 2011  

Abstract: The biologically inspired model (BIM) proposed by Serre et al. presents a promising solution to object categorization. It emulates the process of object recognition in primates' visual cortex by constructing a set of scale- and position-tolerant features whose properties are similar to those of the cells along the ventral stream of visual cortex. However, BIM has potential to be further improved in two aspects: mismatch by dense input and randomly feature selection due to the feedforward framework. To solve or alleviate these limitations, we develop an enhanced BIM (EBIM) in terms of the following two aspects: 1) removing uninformative inputs by imposing sparsity constraints, 2) apply a feedback loop to middle level feature selection. Each aspect is motivated by relevant psychophysical research findings. To show the effectiveness of the EBIM, we apply it to object categorization and conduct empirical studies on four computer vision data sets. Experimental results demonstrate that the EBIM outperforms the BIM and is comparable to state-of-the-art approaches in terms of accuracy. Moreover, the new system is about 20 times faster than the BIM.

Accession Number: WOS:000297342100018

PubMed ID: 21768049

Author Identifiers:

ISSN: 1083-4419

eISSN: 1941-0492

Record 6 of 209

Title: Low-repetition-rate ytterbium-doped fiber laser based on a CFBG from large anomalous to large normal dispersion

Author(s): Li, XH (Li, X. H.); Wang, YS (Wang, Y. S.); Zhang, W (Zhang, W.); Zhao, W (Zhao, W.); Hu, XH (Hu, X. H.); Yang, Z (Yang, Z.); Gao, CX (Gao, C. X.); Wang, XL (Wang, X. L.); Liu, XL (Liu, X. L.); Shen, DY (Shen, D. Y.); Li, C (Li, C.)

Source: LASER PHYSICS  Volume: 21  Issue: 12  Pages: 2112-2117  DOI: 10.1134/S1054660X11210110  Published: DEC 2011  

Abstract: We report on the long-cavity ytterbium-doped fiber laser based on a chirped fiber Bragg grating (CFBG) to control the dispersion in the cavity. The proposed fiber lasers operating in large anomalous dispersion and large normal dispersion are intensively studied in this paper. To the best of our knowledge, this is the first time for us to give the dispersion map over such a wide range. The experimental results show that, for large anomalous dispersion, the state of soliton rains can be obtained. Nanosecond pulse is obtained in the large normal dispersion regime with spectral filter which is different from the operation mode without spectral filter. This study may pave the way to best apply the fiber laser in many fields.

Accession Number: WOS:000297733300023

Author Identifiers:

ISSN: 1054-660X

eISSN: 1555-6611

Record 7 of 209

Title: High power tunable picosecond green laser pulse generation by frequency doubling of an Yb-doped fiber power amplifier seeded by a gain switch laser diode

Author(s): Liu, HJ (Liu, H. J.); Li, XF (Li, X. F.)

Source: LASER PHYSICS  Volume: 21  Issue: 12  Pages: 2118-2121  DOI: 10.1134/S1054660X11210146  Published: DEC 2011  

Abstract: A compact tunable high power picosecond green laser pulse source based on frequency doubling of an Yb-doped fiber amplifier seeded by a gain switch laser diode has been developed. The fiber amplifier generates the picosecond infrared pulses with average power of 10.3 W, repetition rate of 1 MHz, pulse duration of 150 ps, and tunable range of 20 nm around 1064 nm. For underwater use, the tunable output infrared pulses are frequency doubled into picosecond green laser pulses, which can be tuned from 527 to 537 nm with average power of more than 1.1 W, corresponding to an overall conversion efficiency of 10.7% by a BBO nonlinear crystal. This kind of laser source will have potential application for underwater optical communication.

Accession Number: WOS:000297733300024

Author Identifiers:

ISSN: 1054-660X

eISSN: 1555-6611

Record 8 of 209

Title: Shadow Detection in Remotely Sensed Images Based on Self-Adaptive Feature Selection

Author(s): Liu, JH (Liu, Jiahang); Fang, T (Fang, Tao); Li, DR (Li, Deren)

Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 49  Issue: 12  Pages: 5092-5103  DOI: 10.1109/TGRS.2011.2158221  Part: 2  Published: DEC 2011  

Abstract: Shadows in remotely sensed images create difficulties in many applications; thus, they should be effectively detected prior to further processing. This paper presents a novel semiautomatic shadow detection method that meets the requirements of both high accuracy and wide practicability in remote sensing applications. The proposed method uses only the properties derived from the shadow samples to dynamically generate a feature space and calculate decision parameters; then, it employs a series of transformations to separate shadow and nonshadow regions. The proposed method can detect shadows from both color and gray images. If the chromatic properties of color images do not agree with the defined rules through the shadow samples, then the shadow detection process will automatically reduce to the process for gray images. As the shadow samples are manually selected from the input image by the user, the derived parameters conform well to the characteristics of the input image. Experiments and comparisons indicate that the proposed self-adaptive feature selection algorithm is accurate, effective, and widely applicable to shadow detection in practical applications.

Accession Number: WOS:000297282300012

Author Identifiers:

ISSN: 0196-2892

eISSN: 1558-0644

Record 9 of 209

Title: Design of Topas microstructured fiber with ultra-flattened chromatic dispersion and high birefringence

Author(s): Wang, DD (Wang, Doudou); Wang, LL (Wang, Lili)

Source: OPTICS COMMUNICATIONS  Volume: 284  Issue: 24  Pages: 5568-5571  DOI: 10.1016/j.optcom.2011.08.040  Published: DEC 1 2011  

Abstract: A microstructured polymer optical fiber (mPOF) with both ultra-flattened near-zero chromatic dispersion and high birefringence based on Topas cyclic olefin copolymer is designed. Three rings of uniform elliptical air holes are arranged in triangular lattice in the cladding and an extra small defected hole is introduced in the fiber core. Guided modes, dispersion, birefringence and mode confinement properties of the designed mPOF are investigated by using the full-vector finite element method. Dispersion values between +/- 0.5 ps/km/nm over the wavelength 1.1-1.7 mu m and high birefringence of the order of 10(-3) are obtained for the optimized fiber structure. Low confinement losses and small effective mode area are obtained at the same time. The relatively simple architecture of the proposed Topas mPOF can be fabricated by our extrusion-stretching techniques. (C) 2011 Elsevier B.V. All rights reserved.

Accession Number: WOS:000296687100010

ISSN: 0030-4018

Record 10 of 209

Title: Growth of short-period InAs/GaSb superlattices for infrared sensing

Author(s): Wang, T (Wang Tao); Yang, J (Yang Jin); Yin, F (Yin Fei); Wang, JW (Wang Jing-Wei); Hu, YN (Hu Ya-Nan); Zhang, LC (Zhang Li-Chen); Yin, JZ (Yin Jing-Zhi)

Source: JOURNAL OF INFRARED AND MILLIMETER WAVES  Volume: 30  Issue: 6  Pages: 511-+  DOI: 10.3724/SP.J.1010.2011.00511  Published: DEC 2011  

Abstract: The InAs/GaSb superlattice were prepared by metal organic chemical vapor deposition (MOCVD) on GaSb substrate. The optimized thickness and the various growth parameters were explored as well as the importance of source flux control. The photoluminescence (PL) spectra, x-ray diffraction data (XRD) and the surface topography map showed that the superlattice can response to incident light with long wavelength of 10 mu m, and has good surface morphology and epitaxial layer quality.

Accession Number: WOS:000298550700008

Author Identifiers:

ISSN: 1001-9014

Record 11 of 209

Title: Spectrum reshaping of amplified pulse in silicon nanowaveguide

Author(s): Wu, JW (Wu, Jian-Wei); Sarma, AK (Sarma, Amarendra K.); Zhang, XP (Zhang, Xu-Ping)

Source: OPTICS COMMUNICATIONS  Volume: 284  Issue: 24  Pages: 5641-5644  DOI: 10.1016/j.optcom.2011.08.010  Published: DEC 1 2011  

Abstract: A device consisting of a cascaded semiconductor optical amplifier (SOA) and silicon on insulator (SOI) optical waveguide is presented to amplify and reshape the frequency spectrum of optical pulses in the picoseconds time duration. Numerical simulations show that the output spectrum of the amplified pulse by SOA can be effectively reshaped by utilizing the SOI waveguide. The length of the SOI waveguide may be judiciously adjusted to significantly reduce the frequency chirp of the output pulse from the SOA resulting in reshaping of the output spectrum. We find that the property of pulse spectrum is sensitive to the input pulse power and its temporal width. (C) 2011 Elsevier B.V. All rights reserved.

Accession Number: WOS:000296687100020

Author Identifiers:

ISSN: 0030-4018

Record 12 of 209

Title: Impact of dispersion profiles of silicon waveguides on optical parametric amplification in the femtosecond regime

Author(s): Wang, ZL (Wang, Zhaolu); Liu, HJ (Liu, Hongjun); Huang, N (Huang, Nan); Sun, QB (Sun, Qibing); Wen, J (Wen, Jin)

Source: OPTICS EXPRESS  Volume: 19  Issue: 24  Pages: 24730-24737  DOI: 10.1364/OE.19.024730  Published: NOV 21 2011  

Abstract: The impact of dispersion profiles of silicon waveguides on femtosecond optical parametric amplification (OPA) is theoretically investigated. It is found that flat quasi-phase-matching, smooth temporal profiles and separable spectra for 200 fs pulses can be obtained by tailoring the cross-section of silicon rib waveguide. We achieve on-chip parametric gain as high as 26.8 dB and idler conversion gain of 25.6 dB for a low pump peak power over a flat bandwidth of 400 nm in a 10-mm-long dispersion engineered silicon waveguide. Our on-chip OPA can find important potential applications in highly integrated optical circuits for all-optical ultrafast signal processing. (C) 2011 Optical Society of America

Accession Number: WOS:000298322000112

PubMed ID: 22109500

Author Identifiers:

ISSN: 1094-4087

Record 13 of 209

Title: Interaction and motion of solitons in passively- mode-locked fiber lasers

Author(s): Liu, XM (Liu, Xueming)

Source: PHYSICAL REVIEW A  Volume: 84  Issue: 5  Article Number: 053828  DOI: 10.1103/PhysRevA.84.053828  Published: NOV 14 2011  

Abstract: Interaction and motion of multiple solitons in passively-mode-locked (PML) fiber lasers are investigated numerically. Three types of relative motions of two solitons are found in PML fiber lasers. The numerical results show that the relative motion of solitons attributes to the phase shift, which corresponds to the instantaneous frequency at pulse peak to be nonzero. Different from the classical dynamics of billiard balls, the interaction of solitons is similar to the Feynman diagram which is a pictorial way to represent the interaction of particles. After solitons interact with one another, their shapes do not change, but their phases shift and relative motions change. The theoretical results demonstrate that the separation of neighboring solitons in the laser cavity is about several hundred picoseconds to several nanoseconds. The theoretical predictions are in good agreement with the experimental results.

Accession Number: WOS:000297094500022

Author Identifiers:

ISSN: 1050-2947

eISSN: 1094-1622

Record 14 of 209

Title: Broadband terahertz spectroscopy

Author(s): Fan, WH (Fan, Wenhui)

Source: CHINESE OPTICS LETTERS  Volume: 9  Issue: 11  Special Issue: SI  Article Number: 110008  DOI: 10.3788/COL201109.110008  Published: NOV 10 2011  

Abstract: An overview of the major techniques to generate and detect THz radiation so far, especially the major approaches to generate and detect coherent ultra-short THz pulses using ultra-short pulsed laser, has been presented. And also, this paper, in particularly, focuses on broadband THz spectroscopy and addresses on a number of issues relevant to generation and detection of broadband pulsed THz radiation as well as broadband time-domain THz spectroscopy (THz-TDS) with the help of ultra-short pulsed laser. The time-domain waveforms of coherent ultra-short THz pulses from photoconductive antenna excited by femtosecond laser with different pulse durations and their corresponding Fourier-transformed spectra have been obtained via the numerical simulation of ultrafast dynamics between femtosecond laser pulse and photoconductive material. The origins of fringes modulated on the top of broadband amplitude spectrum, which is measured by electric-optic detector based on thin nonlinear crystal and extracted by fast Fourier transformation, have been analyzed and the major solutions to get rid of these fringes are discussed.

Accession Number: WOS:000296894000008

Author Identifiers:

ISSN: 1671-7694

Record 15 of 209

Title: Non-absorption grating approach for X-ray phase contrast imaging

Author(s): Du, Y (Du, Yang); Liu, X (Liu, Xin); Lei, YH (Lei, Yaohu); Guo, JC (Guo, Jinchuan); Niu, HB (Niu, Hanben)

Source: OPTICS EXPRESS  Volume: 19  Issue: 23  Pages: 22669-22674  DOI: 10.1364/OE.19.022669  Published: NOV 7 2011  

Abstract: we demonstrate a non-absorption grating approach for X-ray phase contrast imaging based-on grating interferometry. This technique overcomes the limitations imposed by absorption gratings, provides another choice for X-ray phase contrast imaging and potentially improves the image quality for higher X-ray photon energies. We constructed the key devices, established the system and obtained phase contrast images with a field of view larger than 5 centimeters, which is the limitation imposed by the size of our current CCD detector. This method has no need for absorption gratings, which represents a significant development for future promising applications in medicine and industry. (C)2011 Optical Society of America

Accession Number: WOS:000296904700050

PubMed ID: 22109147

ISSN: 1094-4087

Record 16 of 209

Title: InAs/GaSb superlattices grown by LP-MOCVD for ∼10 μm wavelength infrared range

Author(s): Chang, YC (Chang, Yuchun); Wang, T (Wang, Tao); Yin, F (Yin, Fei); Wang, JW (Wang, Jingwei); Song, ZY (Song, Zhenyu); Wang, YD (Wang, Yiding); Yin, JZ (Yin, Jingzhi)

Source: INFRARED PHYSICS & TECHNOLOGY  Volume: 54  Issue: 6  Pages: 478-481  DOI: 10.1016/j.infrared.2011.07.009  Published: NOV 2011  

Abstract: A type-II InAs/GaSb superlattice (SL) was grown on Te-doped (1 0 0) GaSb substrate by low pressure metal organic chemical vapor deposition (LP-MOCVD). The samples were obtained at different growth temperatures and with different interface layers. By introducing an InAsSb interface layer between InAs and GaSb, a good surface morphology of the superlattice was achieved when the sample growth temperature was around 500-520 degrees C. The photoluminescence (PL) peak wavelength of the sample was 10.7 mu m at 77 K, with FWHM of similar to 30 meV. (C) 2011 Elsevier B.V. All rights reserved.

Accession Number: WOS:000297183100006

Author Identifiers:

ISSN: 1350-4495

eISSN: 1879-0275

Record 17 of 209

Title: Phase-shifting Zernike phase contrast microscopy for quantitative phase measurement

Author(s): Gao, P (Gao, Peng); Yao, BL (Yao, Baoli); Harder, I (Harder, Irina); Lindlein, N (Lindlein, Norbert); Torcal-Milla, FJ (Torcal-Milla, Francisco Jose)

Source: OPTICS LETTERS  Volume: 36  Issue: 21  Pages: 4305-4307  DOI: 10.1364/OL.36.004305  Published: NOV 1 2011  

Abstract: Zernike phase contrast microscopy is extended and combined with a phase-shifting mechanism to perform quantitative phase measurements of microscopic objects. Dozens of discrete point light sources on a ring are constructed for illumination. For each point light source, three different levels of point-like phase steps are designed, which are alternatively located along a ring on a silica plate to perform phase retardation on the undiffracted (dc) component of the object waves. These three levels of the phase steps are respectively selected by rotating the silica plate. Thus, quantitative evaluation of phase specimens can be performed via phase-shifting mechanism. The proposed method has low "halo" and "shade-off" effects, low coherent noise level, and high lateral resolution due to the improved illumination scheme. (C) 2011 Optical Society of America

Accession Number: WOS:000296734700061

PubMed ID: 22048399

Author Identifiers:

ISSN: 0146-9592

Record 18 of 209

Title: Active optical system for any field angle zoom

Author(s): Hu, SL (Hu, Shaolei); Zhao, X (Zhao, Xin); Dong, WH (Dong, Weihui); Xie, YJ (Xie, Yongjun)

Source: OPTICAL ENGINEERING  Volume: 50  Issue: 11  Article Number: 113001  DOI: 10.1117/1.3654181  Published: NOV 2011  

Abstract: We have theoretically proposed a new type of active optical zoom system. It can change the magnification of an imaging system at any field angle, namely, it can change the effective focal length at a limited region of interest and simultaneously maintain high resolution. It is comprised of two static aspheric mirrors and two deformable mirrors; furthermore, by changing the curvature of mirrors the focal length can be adjusted from -399 to -558.6 mm. The system reduces the bandwidth of data transmission and may find potential applications in high speed photography. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3654181]

Accession Number: WOS:000296971600015

ISSN: 0091-3286

Record 19 of 209

Title: Wideband slow light with ultralow dispersion in a W1 photonic crystal waveguide

Author(s): Liang, J (Liang, Jian); Ren, LY (Ren, Li-Yong); Yun, MJ (Yun, Mao-Jin); Wang, XJ (Wang, Xing-Jun)

Source: APPLIED OPTICS  Volume: 50  Issue: 31  Pages: G98-G103  DOI: 10.1364/AO.50.000G98  Published: NOV 1 2011  

Abstract: A dispersion tailoring scheme for obtaining slow light in a silicon-on-insulator W1-type photonic crystal waveguide, novel to our knowledge, is proposed in this paper. It is shown that, by simply shifting the first two rows of air holes adjacent to the waveguide to specific directions, slow light with large group-index, wideband, and low group-velocity dispersion can be realized. Defining a criterion of restricting the group-index variation within a +/- 0: 8% range as a flattened region, we obtain the ultraflat slow light with bandwidths over 5.0, 4.0, 2.5, and 1.0nm when keeping the group index at 38.0, 48.8, 65.2, and 100.4, respectively. Numerical simulations are performed utilizing the three-dimensional (3D) plane-wave expansion method and the 3D finite-difference time-domain method. (C) 2011 Optical Society of America

Accession Number: WOS:000297162700018

PubMed ID: 22086056

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 20 of 209

Title: Multi-wavelength ultraviolet terawatt-order CPA system

Author(s): Ling, WJ (Ling Wei-Jun); Zhang, SG (Zhang Shao-Gang); Li, K (Li Ke); Zhang, MX (Zhang Ming-Xia); Wang, YS (Wang Yi-Shan); Zhao, W (Zhao Wei); Wang, ZH (Wang Zhao-Hua); Wei, ZY (Wei Zhi-Yi)

Source: ACTA PHYSICA SINICA  Volume: 60  Issue: 11  Article Number: 114215  DOI: 10.7498/aps.60.114215  Published: NOV 2011  

Abstract: We set up a multi-wavelength ultraviolet terawatt-order chirped pulse amplification (CPA) system according to the CPA technology and the frequency conversion technology. The system offers 1Hz, 5Hz and 10Hz high energy ultraviolet pulses by precise time synchronization among 5 repeat frequencies. The RMS of output energy fluctuation rate of CPA is less than 2% with using a pre-amplified system of energy fluctuation rate less than 0.3% RMS and a time synchronizer with time jitter less than 3 ns. The multi-wavelength high energy ultraviolet pulses with 64 mJ/400 nm,16 mJ/267 nm and 5 mJ/205 nm are obtained, and their corresponding peak powers reach the terawatt level.

Accession Number: WOS:000298442100059

Author Identifiers:

ISSN: 1000-3290

Record 21 of 209

Title: Helium-Implanted Optical Planar Waveguides in Nd<SUP>3+</SUP>-Doped Phosphate Glass

Author(s): Liu, CX (Liu Chun-Xiao); Liu, T (Liu Tao); Liu, XH (Liu Xiu-Hong); Wei, W (Wei Wei); Peng, B (Peng Bo)

Source: CHINESE PHYSICS LETTERS  Volume: 28  Issue: 11  Article Number: 114205  DOI: 10.1088/0256-307X/28/11/114205  Published: NOV 2011  

Abstract: We report the fabrication of planar waveguides in Nd3+-doped phosphate glass by helium ion implantation. The guiding properties of the waveguide are evaluated by a prism coupler and end-face coupling methods. The refractive index profile of the waveguide is reconstructed by using the intensity calculation method. Absorption and fluorescence investigations reveal that helium ion implantation causes only slight changes in the optical properties, suggesting the possible application of the fabricated structures as waveguide lasers.

Accession Number: WOS:000297284600032

Author Identifiers:

ISSN: 0256-307X

eISSN: 1741-3540

Record 22 of 209

Title: Generation of 10-GHz Duty-Cycle Tunable Square Optical Pulse in an SOA-Based Mode-Locked Fiber Laser

Author(s): Luo, D (Luo, D.); Yan, SY (Yan, S. Y.); Xie, XP (Xie, X. P.); Zhao, W (Zhao, W.)

Source: LASER PHYSICS  Volume: 21  Issue: 11  Pages: 1909-1913  DOI: 10.1134/S1054660X11190224  Published: NOV 2011  

Abstract: We demonstrate the generation of 10-GHz optical square pulses by injecting a picosecond pulse train into an SOA-based mode-locked fiber laser. The novel scheme exploits nonlinear effects and gain saturation phenomenon in the semiconductor optical amplifier (SOA). This technique uses gain-compression dynamics between the input pulses and the generated ones in gain-saturated SOA to form square pulses. The center wavelength of the generated optical square pulse can be tuned from 1530 to 1570 nm by adjusting the center wavelength of the optical band pass filter (OBPF) in the SOA-based mode-locked fiber ring laser. The duty cycle of the output pulse can be tuned from 12.7 to 88.4%, which strongly depends on the input power and intra-cavity power.

Accession Number: WOS:000297732800015

Author Identifiers:

ISSN: 1054-660X

eISSN: 1555-6611

Record 23 of 209

Title: Dispersion-Insensitive Low-Coherent Pulses Emerging from Nonlinear Polarization Switching

Author(s): Mao, D (Mao, D.); Liu, XM (Liu, X. M.); Lu, H (Lu, H.); Wang, LR (Wang, L. R.); Duan, LN (Duan, L. N.)

Source: LASER PHYSICS  Volume: 21  Issue: 11  Pages: 1903-1908  DOI: 10.1134/S1054660X11190236  Published: NOV 2011  

Abstract: We have experimentally investigated low-repetition nanosecond pulses delivered from an erbium-doped fiber (EDF) laser operating in ultra-large anomalous dispersion regime. The output pulses with rectangular profile and Gaussian spectrum almost keep invariable when they propagate through either normal- or anomalous-dispersion fibers. After nanosecond pulses are amplified via a two-stage EDF amplifier, they are broken up and exhibited as flatly broadened supercontinuum from 1520 to 1700 nm if amplified pulses are launched into a 10-km single-mode fiber, whereas the pulses retain the same duration with a broadband supercontinuum from 1200 to 1750 nm if they are input into a 100-m highly-nonlinear low-dispersion photonic-crystal fiber (PCF). The experimental observations demonstrate that the nanosecond pulses result from nonlinear polarization switching and can be regarded as dispersion-insensitive low-coherent pulses rather than compressible pulses.

Accession Number: WOS:000297732800014

Author Identifiers:

ISSN: 1054-660X

Record 24 of 209

Title: Low-Temperature Brush-Shaped Large-Volume Plasma Generated by Direct Current Discharge at Atmospheric Pressure

Author(s): Sun, AM (Sun, Aimin); Tang, J (Tang, Jie); Cao, WQ (Cao, Wenqing); Zhao, W (Zhao, Wei); Duan, YX (Duan, Yixiang)

Source: IEEE TRANSACTIONS ON PLASMA SCIENCE  Volume: 39  Issue: 11  Special Issue: SI  Pages: 2084-2085  DOI: 10.1109/TPS.2011.2132742  Part: 1  Published: NOV 2011  

Abstract: Low-temperature plasma is generated by glow discharge with a high direct current power supply and argon gas. A brush-shaped plasma source with large volume is obtained with a width of 15 mm, a thickness of 1 mm, and a length of about 18 mm. The source design and mechanism of the plasma generation are presented and discussed. The large-volume plasma source provides advantages in surface treatment, such as high working efficiency, sufficient utilization of the plasma gas, and natural cooling down. The characteristics of large volume, high energy density, and low temperature allow this kind of plasma source to be more suitable to practical applications.

Accession Number: WOS:000299683400015

ISSN: 0093-3813

eISSN: 1939-9375

Record 25 of 209

Title: Nonequilibrium Plasmas Generated by Dielectric Barrier Discharges at Atmospheric Pressure

Author(s): Tang, J (Tang, Jie); Zhao, W (Zhao, Wei); Duan, JN (Duan, Jiana); Duan, YX (Duan, Yixiang)

Source: IEEE TRANSACTIONS ON PLASMA SCIENCE  Volume: 39  Issue: 11  Special Issue: SI  Pages: 2080-2081  DOI: 10.1109/TPS.2011.2159126  Part: 1  Published: NOV 2011  

Abstract: Both propane plasma and air plasma are successfully generated at atmospheric pressure by using two dielectric barrier discharge reactors with different configurations, in which one is used to activate propane and the other is used to activate air. The plasma pictures show that the microdischarge channels in the plasmas increase and become increasingly more uniform with the deposited power under both activation methods. It is found that the propane plasma is of an ivory white color, while the air plasma is purple, as a result of the different gas components. A 30-W propane or air plasma leads to a significant temperature rise of the main flame, attributed to the production of reactive radicals and fuel fragments in such plasmas.

Accession Number: WOS:000299683400013

ISSN: 0093-3813

Record 26 of 209

Title: Spatial Domain Display for Interference Image Dataset

Author(s): Wang, CL (Wang Cai-ling); Li, YS (Li Yu-shan); Liu, XB (Liu Xue-bin); Hu, BL (Hu Bing-liang); Jing, JJ (Jing Juan-juan); Wen, J (Wen Jia)

Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 31  Issue: 11  Pages: 3158-3162  DOI: 10.3964/j.issn.1000-0593(2011)11-3158-05  Published: NOV 2011  

Abstract: The requirements of imaging interferometer visualization is imminent for the user of image interpretation and information extraction. However, the conventional researches on visualization only focus on the spectral image dataset in spectral domain. Hence, the quick show of interference spectral image dataset display is one of the nodes in interference image processing. The conventional visualization of interference dataset chooses classical spectral image dataset display method after Fourier transformation. In the present paper, the problem of quick view of interferometer imager in image domain is addressed and the algorithm is proposed which simplifies the matter. The Fourier transformation is an obstacle since its computation time is very large and the complexion would be even deteriorated with the size of dataset increasing. The algorithm proposed, named interference weighted envelopes, makes the dataset divorced from transformation. The authors choose three interference weighted envelopes respectively based on the Fourier transformation, features of interference data and human visual system. After comparing the proposed with the conventional methods, the results show the huge difference in display time.

Accession Number: WOS:000296689700063

PubMed ID: 22242539

ISSN: 1000-0593

Record 27 of 209

Title: Preliminary Study of Zinc Ion Sensor with the Function of Imaging

Author(s): Wang, J (Wang Jian); Wang, LL (Wang Li-li)

Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 31  Issue: 11  Pages: 3145-3148  DOI: 10.3964/j.issn.1000-0593(2011)11-3145-04  Published: NOV 2011  

Abstract: A zinc ion fluorescence sensor with imaging was fabricated by using 1-(2-Pyridylazo)-2-naphthol and fluorescent reagent of rhodamine B together as the indication which was immobilized on an tip of gradient index lens by base catalyzed sol-gel method. Combined with improved metallographic microscope and laser, the measurement of zinc ion concentration and the view of sample morphology could be realized simultaneously by this system. The sensor has the linear range of zinc ion concentration from 0.1 to 1 mmol . L(-1). Moreover, it has the capabilities of imaging with the whole system's resolution of 18.73 lp . mm(-1). This sensor with the function of imaging has the potential applications in biosensing.

Accession Number: WOS:000296689700060

PubMed ID: 22242536

Author Identifiers:

ISSN: 1000-0593

Record 28 of 209

Title: Femtosecond electron pulse compression by using the time focusing technique in ultrafast electron diffraction

Author(s): Wen, WL (Wen Wen-Long); Lei, XH (Lei Xiao-Hong); Hu, X (Hu Xin); Xu, XY (Xu Xiang-Yan); Wang, JF (Wang Jun-Feng); Cao, XB (Cao Xi-Bin); Liu, HL (Liu Hu-Lin); Wang, C (Wang Chao); Dang, LH (Dang Li-Hong); Tian, JS (Tian Jin-Shou)

Source: CHINESE PHYSICS B  Volume: 20  Issue: 11  Article Number: 114102  DOI: 10.1088/1674-1056/20/11/114102  Published: NOV 2011  

Abstract: We present a new model of an electron gun for generating subrelativistic femtosecond (fs) electron pulses. The basic idea is to utilize a dc acceleration stage combined with a time focusing region, the time focusing electrode generates an electron energy chirp for bunching at the target. Without considering the space charge effects, simulations of the electron gun were carried out under the conditions of different dc voltages and various slopes of the voltage added on the time focusing electrode. Tracing and simulating large numbers of photoelectrons through Monte-Carlo and finite difference methods, the electron pulses with 1 ps can be compressed to 55 fs, which will allow significant advances in the field of ultrafast diagnosis.

Accession Number: WOS:000298491700032

Author Identifiers:

ISSN: 1674-1056

eISSN: 1741-4199

Record 29 of 209

Title: Theoretical study of all-optical RZ to NRZ format conversion based on cascaded nanoporous silicon waveguides

Author(s): Wu, JW (Wu, Jian-Wei)

Source: INFRARED PHYSICS & TECHNOLOGY  Volume: 54  Issue: 6  Pages: 465-468  DOI: 10.1016/j.infrared.2011.07.011  Published: NOV 2011  

Abstract: In this paper, we present that the strong free carrier absorption and short carrier lifetime in nanoporous silicon waveguide can perform effectively the return-to-zero (RZ) to non-return-to zero (NRZ) format conversion. The project presented consisting of two cascaded millimeters long nanoporous silicon waveguides is numerically simulated and investigated at 5 Gbit/s. Numerical results clearly show that the outcome converted signal (NRZ) at the end of proposed device can be effectively optimized (e.g. clearer extinction ratio - ER, higher Q-factor, and lower bit-error rate - BER) by means of suitably choosing the system parameters such as initial RZ peak level and nanoporous silicon waveguide length. (C) 2011 Elsevier B.V. All rights reserved.

Accession Number: WOS:000297183100004

Author Identifiers:

ISSN: 1350-4495

Record 30 of 209

Title: Decoding algorithms of single photon counting imager based on two-dimensional Vernier anodes

Author(s): Yang, H (Yang Hao); Zhao, BS (Zhao BaoSheng); Yan, QR (Yan QiuRong); Liu, YA (Liu YongAn); Hu, HJ (Hu HuiJun)

Source: SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY  Volume: 54  Issue: 11  Pages: 1943-1947  DOI: 10.1007/s11433-011-4490-y  Published: NOV 2011  

Abstract: The decoding algorithms of two-dimensional Vernier anodes are deduced theoretically. The precision of decoding and uniqueness of encoding are proved. The influencing factors of detection sensitivity and spatial resolution are discussed. The single photon imaging system is constructed, and the two-dimensional Vernier collector is fabricated. The image of the ultra-weak emission source is reconstructed. The spatial resolution of the system is about 100 mu m.

Accession Number: WOS:000297362200004

Author Identifiers:

ISSN: 1674-7348

eISSN: 1869-1927

Record 31 of 209

Title: Real-Time Measurement of Detonation Transient Temperature

Author(s): Zheng, JK (Zheng Jin-kun); Bai, YL (Bai Yong-lin); Wang, B (Wang Bo); Liu, BY (Liu Bai-yu); Yang, WZ (Yang Wen-zheng); Bai, XH (Bai Xiao-hong); Qin, JJ (Qin Jun-jun); Zhao, JP (Zhao Jun-ping); Gou, YS (Gou Yong-sheng); Liu, H (Liu Hui)

Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 31  Issue: 11  Pages: 3060-3063  DOI: 10.3964/j.issn.1000-0593(2011)11-3060-04  Published: NOV 2011  

Abstract: Based on the spectral characteristic of the detonation temperature, the present paper presents a measurement system of transient multi-wavelength pyrometry with the theory of multi-wavelength thermometry. The FPGA was applied as the hardware developing platform and the high-speed linear CCD was utilized. Each module was controlled by FPGA to achieve the process of real-time data acquisition, storage and transmission. Using the multiple regression analysis method, the dynamic spectral waveforms were calculated. The two laser spectral lines, 630 and 532 nm, were used to calibrate the corresponding pixel sequence numbers and the No. 175 and No. 270 were confirmed. In this paper, the halide tungsten light was measured. The results show that the system can sample continuous spectrum signal at several different times; the CCD can stably work with 40 MHz clock and the frame scanning frequency can achieve 73 kHz.

Accession Number: WOS:000296689700041

PubMed ID: 22242517

Author Identifiers:

ISSN: 1000-0593

Record 32 of 209

Title: Analysis of birefringent and dispersive properties of photonic crystal fibers

Author(s): Lu, S (Lu, S.); Li, W (Li, W.); Guo, H (Guo, H.); Lu, M (Lu, M.)

Source: APPLIED OPTICS  Volume: 50  Issue: 30  Pages: 5798-5802  DOI: 10.1364/AO.50.005798  Published: OCT 20 2011  

Abstract: Two types of high birefringence photonic crystal fiber (PCF) which import four or six big circular air holes near the elliptical-hole are proposed. Their birefringent and dispersive properties are analyzed by full-vector finite-element method (FEM). Numerical analysis demonstrates that importing the big circular hole near the center of elliptical-hole PCFs can achieve a high birefringence. When the ratio (d/Lambda) of diameter to hole spacing is larger than 0.8, the proposed two types of PCF have a larger birefringence than that of sole elliptical air hole ones. When the ratio d/Lambda is equal to 0.95, the birefringences of these two types PCF can be as high as 4.27 x 10(-3) and 5: 09 x 10(-3) at the wavelength of 1.55 mu m, respectively. Besides, PCF with the four big circular air holes has a large negative dispersion at the long wavelength in x-polarized mode, which indicates a potential in single-polarized mode dispersion compensation. (C) 2011 Optical Society of America

Accession Number: WOS:000296555300006

PubMed ID: 22015407

ISSN: 1559-128X

eISSN: 2155-3165

Record 33 of 209

Title: Spatially resolved X-ray spectroscopy using a flat HOPG crystal

Author(s): Yuan, XH (Yuan, X. H.); Carroll, DC (Carroll, D. C.); Coury, M (Coury, M.); Gray, RJ (Gray, R. J.); Brenner, CM (Brenner, C. M.); Lin, XX (Lin, X. X.); Li, YT (Li, Y. T.); Quinn, MN (Quinn, M. N.); Tresca, O (Tresca, O.); Zielbauer, B (Zielbauer, B.); Neely, D (Neely, D.); McKenna, P (McKenna, P.)

Source: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT  Volume: 653  Issue: 1  Pages: 145-149  DOI: 10.1016/j.nima.2010.12.147  Published: OCT 11 2011  

Abstract: A novel design of a 1-D imaging X-ray spectrometer is implemented, using a high efficiency HOPG (highly oriented pyrolitic graphite) Bragg crystal and a double-entrance-slit. The double slit provides self-calibration of the imaging magnification. The spatial and spectral resolutions and dispersion are characterised both analytically and by ray tracing simulations. A key feature of this approach is that it enables the X-ray spectrum to be measured over different regions of the plasma source. The application of this instrument is demonstrated in high intensity laser-foil interaction experiments. (C) 2010 Elsevier B.V. All rights reserved.

Accession Number: WOS:000295663800032

Conference Title: 4th International Conference on Superstrong Fields in Plasmas

Conference Date: OCT 03-09, 2010

Conference Location: Varenna, ITALY

Conference Sponsors: European Sci Fdn (ESF), Piero Caldirola, Universita degli Studi Milano Bicocca, Dipartimento di Energia, Politecnico di Milano, INFN-Natl Inst Nucl Phys, European Phys Soc

Author Identifiers:

ISSN: 0168-9002

eISSN: 1872-9576

Record 34 of 209

Title: Single- and dual-pulse oscillation in a passively Q-switched Nd:YAG microchip laser

Author(s): Niu, LQ (Niu, Linquan); Gao, CX (Gao, Cunxiao); Zhu, SL (Zhu, Shaolan); Sun, CD (Sun, Chuandong); He, HD (He, Haodong); Song, ZY (Song, Zhiyuan); Tang, WD (Tang, Weidong)

Source: OPTICS EXPRESS  Volume: 19  Issue: 21  Pages: 20628-20633  DOI: 10.1364/OE.19.020628  Published: OCT 10 2011  

Abstract: Experimental investigation of single and dual pulses in a passively Q-switched Nd:YAG microchip laser with a Cr4+:YAG saturable absorber has been reported. The dual pulses consist of a main and a satellite pulse with respective spectra, intensities, and durations. It is found that the preponderant oscillating mode gives birth to the main pulse, and the other oscillating mode corresponds to the satellite pulse. Our results demonstrate that the dual-pulse emission results from double-longitudinal-mode oscillation in high pump regime. (C)2011 Optical Society of America

Accession Number: WOS:000296065700085

PubMed ID: 21997072

ISSN: 1094-4087

Record 35 of 209

Title: Biopsy needle detection in transrectal ultrasound

Author(s): Ayvaci, A (Ayvaci, Alper); Yan, PK (Yan, Pingkun); Xu, S (Xu, Sheng); Soatto, S (Soatto, Stefano); Kruecker, J (Kruecker, Jochen)

Source: COMPUTERIZED MEDICAL IMAGING AND GRAPHICS  Volume: 35  Issue: 7-8  Special Issue: SI  Pages: 653-659  DOI: 10.1016/j.compmedimag.2011.03.005  Published: OCT-DEC 2011  

Abstract: Using the fusion of pre-operative MRI and real time intra-procedural transrectal ultrasound (TRUS) to guide prostate biopsy has been shown as a very promising approach to yield better clinical outcome than the routinely performed TRUS only guided biopsy. In several situations of the MRI/TRUS fusion guided biopsy, it is important to know the exact location of the deployed biopsy needle, which is imaged in the TRUS video. In this paper, we present a method to automatically detect and segment the biopsy needle in TRUS. To achieve this goal, we propose to combine information from multiple resources, including ultrasound probe stability, TRUS video background model, and the prior knowledge of needle orientation and position. The proposed algorithm was tested on TRUS video sequences which have in total more than 25,000 frames. The needle deployments were successfully detected and segmented in the sequences with high accuracy and low false-positive detection rate. (C) 2011 Elsevier Ltd. All rights reserved.

Accession Number: WOS:000295542800015

PubMed ID: 21531538

Author Identifiers:

ISSN: 0895-6111

eISSN: 1879-0771

Record 36 of 209

Title: Vehicle Detection and Motion Analysis in Low-Altitude Airborne Video Under Urban Environment

Author(s): Cao, XB (Cao, Xianbin); Wu, CX (Wu, Changxia); Lan, JH (Lan, Jinhe); Yan, PK (Yan, Pingkun); Li, XL (Li, Xuelong)

Source: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY  Volume: 21  Issue: 10  Pages: 1522-1533  DOI: 10.1109/TCSVT.2011.2162274  Published: OCT 2011  

Abstract: Visual surveillance from low-altitude airborne platforms plays a key role in urban traffic surveillance. Moving vehicle detection and motion analysis are very important for such a system. However, illumination variance, scene complexity, and platform motion make the tasks very challenging. In addition, the used algorithms have to be computationally efficient in order to be used on a real-time platform. To deal with these problems, a new framework for vehicle detection and motion analysis from low-altitude airborne videos is proposed. Our paper has two major contributions. First, to speed up feature extraction and to retain additional global features in different scales for higher classification accuracy, a boosting light and pyramid sampling histogram of oriented gradients feature extraction method is proposed. Second, to efficiently correlate vehicles across different frames for vehicle motion trajectories computation, a spatio-temporal appearance-related similarity measure is proposed. Compared to other representative existing methods, our experimental results showed that the proposed method is able to achieve better performance with higher detection rate, lower false positive rate, and faster detection speed.

Accession Number: WOS:000295585000016

Author Identifiers:

ISSN: 1051-8215

eISSN: 1558-2205

Record 37 of 209

Title: Rapid pedestrian detection in unseen scenes

Author(s): Cao, XB (Cao, Xianbin); Wang, Z (Wang, Zhong); Yan, PK (Yan, Pingkun); Li, XL (Li, Xuelong)

Source: NEUROCOMPUTING  Volume: 74  Issue: 17  Pages: 3343-3350  DOI: 10.1016/j.neucom.2011.05.019  Published: OCT 2011  

Abstract: In this paper, a rapid adaptive pedestrian detection method based on cascade classifier with ternary pattern is proposed. The proposed method achieves its goal by employing the following three new strategies: (1) A method for adjusting the key parameters of the trained cascade classifier dynamically for detecting pedestrians in unseen scenes using only a small amount of labeled data from the new scenes. (2) An efficient optimization method is proposed, based on the cross entropy method and a priori knowledge of the scenes, to solve the classifier parameter optimization problem. (3) In order to further speed up pedestrian detection in unseen scenes, each strong classifier in the cascade employs a ternary detection pattern. In our experiments, two significantly different datasets, AHHF and NICTA, were used as the training set and testing set, respectively. The experimental results showed that the proposed method can quickly adapt a previously trained detector for pedestrian detection in various scenes compared with other existing methods. (C) 2011 Elsevier B.V. All rights reserved.

Accession Number: WOS:000296212400066

Author Identifiers:

ISSN: 0925-2312

eISSN: 1872-8286

Record 38 of 209

Title: Comparison of supercontinuum generation based on high-energy nanosecond pulses via single-mode and photonic-crystal fibers

Author(s): Duan, LN (Duan, L. N.); Liu, XM (Liu, X. M.); Wang, LR (Wang, L. R.); Mao, D (Mao, D.); Wang, GX (Wang, G. X.)

Source: LASER PHYSICS  Volume: 21  Issue: 10  Pages: 1813-1819  DOI: 10.1134/S1054660X11190091  Published: OCT 2011  

Abstract: We have experimentally investigated the supercontinuum (SC) generation based on high-energy Gaussian-spectrum pulses emitted from an erbium-doped fiber laser with large-anomalous dispersion. The pulses exhibit rectangular shape in temporal domain with the pulse duration of about 16 ns. When the amplified pulses propagate through 10-km single-mode fiber, the SC ranged from 1530 to 1750 nm arises from the stimulated-Raman-scattering effect and the pulses break up due to the modulation instability. Comparatively, when the amplified pulses propagate through a segment of highly-nonlinear zero-dispersion-flattened photonic crystal fiber, super-broad SC beyond the range of 1300-1750 nm is generated due to strong four-wave mixing effect, whereas the pulses almost maintain their shapes.

Accession Number: WOS:000295535700027

Author Identifiers:

ISSN: 1054-660X

Record 39 of 209

Title: Zernike-Moment-Based Image Super Resolution

Author(s): Gao, XB (Gao, Xinbo); Wang, Q (Wang, Qian); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng); Zhang, KB (Zhang, Kaibing)

Source: IEEE TRANSACTIONS ON IMAGE PROCESSING  Volume: 20  Issue: 10  Pages: 2738-2747  DOI: 10.1109/TIP.2011.2134859  Published: OCT 2011  

Abstract: Multiframe super-resolution (SR) reconstruction aims to produce a high-resolution (HR) image using a set of low-resolution (LR) images. In the process of reconstruction, fuzzy registration usually plays a critical role. It mainly focuses on the correlation between pixels of the candidate and the reference images to reconstruct each pixel by averaging all its neighboring pixels. Therefore, the fuzzy-registration-based SR performs well and has been widely applied in practice. However, if some objects appear or disappear among LR images or different angle rotations exist among them, the correlation between corresponding pixels becomes weak. Thus, it will be difficult to use LR images effectively in the process of SR reconstruction. Moreover, if the LR images are noised, the reconstruction quality will be affected seriously. To address or at least reduce these problems, this paper presents a novel SR method based on the Zernike moment, to make the most of possible details in each LR image for high-quality SR reconstruction. Experimental results show that the proposed method outperforms existing methods in terms of robustness and visual effects.

Accession Number: WOS:000295008100004

PubMed ID: 21926001

Author Identifiers:

ISSN: 1057-7149

eISSN: 1941-0042

Record 40 of 209

Title: Transfer latent variable model based on divergence analysis

Author(s): Gao, XB (Gao, Xinbo); Wang, XM (Wang, Xiumei); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng)

Source: PATTERN RECOGNITION  Volume: 44  Issue: 10-11  Special Issue: SI  Pages: 2358-2366  DOI: 10.1016/j.patcog.2010.06.013  Published: OCT-NOV 2011  

Abstract: Latent variable models are powerful dimensionality reduction approaches in machine learning and pattern recognition. However, this kind of methods only works well under a necessary and strict assumption that the training samples and testing samples are independent and identically distributed. When the samples come from different domains, the distribution of the testing dataset will not be identical with the training dataset. Therefore, the performance of latent variable models will be degraded for the reason that the parameters of the training model do not suit for the testing dataset. This case limits the generalization and application of the traditional latent variable models. To handle this issue, a transfer learning framework for latent variable model is proposed which can utilize the distance (or divergence) of the two datasets to modify the parameters of the obtained latent variable model. So we do not need to rebuild the model and only adjust the parameters according to the divergence, which will adopt different datasets. Experimental results on several real datasets demonstrate the advantages of the proposed framework. (C) 2010 Elsevier Ltd. All rights reserved.

Accession Number: WOS:000292849000014

Author Identifiers:

ISSN: 0031-3203

eISSN: 1873-5142

Record 41 of 209

Title: NUMERICAL SIMULATION OF ULTRA-BROADBAND PHASE-SENSITIVE OPTICAL PARAMETRIC AMPLIFICATION OF IMAGE

Author(s): Li, XF (Li, Xuefeng); Long, HB (Long, Hanbo); Liu, HJ (Liu, Hongjun)

Source: JOURNAL OF RUSSIAN LASER RESEARCH  Volume: 32  Issue: 6  Pages: 547-555  DOI: 10.1007/s10946-011-9245-8  Published: OCT 2011  

Abstract: The ultra-broadband phase-sensitive optical parametric amplification and de-amplification of image in a BBO nonlinear crystal with type I phase-matching are theoretically investigated. Amplified images with a gain of 10(8) and a bandwidth as broad as 420 nm are realized using a 25 GW/cm(-2) peak pump-power density with 1.125 ps chirped-pulse duration. The spatial resolution after optical parametric amplification is estimated to be q(0) -200 rad/mm (i.e., 31.8 lines/mm), which corresponds to the size of the minimum resolvable feature of the amplified image similar to 5 mu m.

Accession Number: WOS:000298231900005

Author Identifiers:

ISSN: 1071-2836

eISSN: 1573-8760

Record 42 of 209

Title: Optimization for limited angle tomography in medical image processing

Author(s): Lu, XQ (Lu, Xiaoqiang); Sun, Y (Sun, Yi); Yuan, Y (Yuan, Yuan)

Source: PATTERN RECOGNITION  Volume: 44  Issue: 10-11  Special Issue: SI  Pages: 2427-2435  DOI: 10.1016/j.patcog.2010.12.016  Published: OCT-NOV 2011  

Abstract: This paper aims to reduce the problems of incomplete data in computed tomography, which happens frequently in medical image process and analysis, e.g., when the high-density region of objects can only be penetrated by X-rays at a limited angular range. As the projection data are available only in an angular range, the incomplete data problem can be attributed to the limited angle problem, which is an ill-posed inverse problem. Image reconstruction based on total variation (TV) reduces the problem and gives better performance on edge-preserving reconstruction: however, the artificial parameter can only be determined through considerable experimentation. In this paper, an effective TV objective function is proposed to reduce the inverse problem in the limited angle tomography. This novel objective function provides a robust and effective reconstruction without any artificial parameter in the iterative processes, using the TV as a multiplicative constraint. The results demonstrate that this reconstruction strategy outperforms some previous ones. (C) 2011 Published by Elsevier Ltd.

Accession Number: WOS:000292849000020

Author Identifiers:

ISSN: 0031-3203

eISSN: 1873-5142

Record 43 of 209

Title: Effects of the Host Morphologies on Luminescence Properties of Nd<SUP>3+</SUP>-Doped LaF₃ Nanoparticles

Author(s): She, JB (She, Jiangbo); Hou, CQ (Hou, Chaoqi); Guol, HT (Guol, Haitao); Gao, C (Gao, Chao); Cui, XX (Cui, Xiaoxia); Lu, M (Lu, Min); Wei, W (Wei, Wei); Peng, B (Peng, Bo)

Source: JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY  Volume: 11  Issue: 10  Pages: 8609-8612  DOI: 10.1166/jnn.2011.4961  Published: OCT 2011  

Abstract: By using different surfactants, several host morphologies including rod-like, pot-like and shuttle-like of LaF(3):Nd(3+) (1% mol) nanoparticles were prepared by a simple microemulsion hydrothermal method, and their properties were characterised by XRD, TEM and photoluminescence spectroscopy. The experimental results indicated that the rod-like and pot-like nanocrystals possess well shaped hollow structures. The analysis of spectra proved that the local environment around the dopant ion changed with the different host morphology, which in turn influenced the luminescence properties. The luminescence lifetimes derived from biexponential fitting were 615 mu s (nanopots), 419 mu s (nanorods) and 194 mu s (nanoshuttles), respectively. This phenomenon is ascribed to the weakening effect of hollow or fenestral structures to the nonradiative ratio.

Accession Number: WOS:000298363900026

PubMed ID: 22400232

Author Identifiers:

ISSN: 1533-4880

Record 44 of 209

Title: HIGH EFFICIENCY AND HIGH BEAM QUALITY 3.467-μm KTA EXTRACAVITY OPTICAL PARAMETRIC OSCILLATOR

Author(s): Sun, QB (Sun, Qibing); Liu, HJ (Liu, Hongjun); Huang, N (Huang, Nan); Ruan, C (Ruan, Chi); Zhu, SL (Zhu, Shaolan); Zhao, W (Zhao, Wei)

Source: MICROWAVE AND OPTICAL TECHNOLOGY LETTERS  Volume: 53  Issue: 10  Pages: 2204-2207  DOI: 10.1002/mop.26247  Published: OCT 2011  

Abstract: An efficient single resonant extracavity optical parametric oscillator is demonstrated based on a Type II noncritical phase matching KTA crystal. Under a pump power of 0.6 W and a pulse width of 13 ns, the average power of 86 mW at 3.467 mu m is obtained with the pulse width of 6 ns and repetition rate of 100 Hz, corresponding to a conversion efficiency as high as 14% from 1.064 to 3.467 mu m. The beam spatial profile for 3.467 pm is near TEM00 mode. The average power of 123 mW is also obtained with a multitransverse mode at the repetition rate of 200 Hz and an average power of 2.3 W of the pump laser. (C) 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2204-2207, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26247

Accession Number: WOS:000293991300003

Author Identifiers:

ISSN: 0895-2477

eISSN: 1098-2760

Record 45 of 209

Title: Two dimensional principal components of natural images and its application

Author(s): Wang, D (Wang, Dong); Lu, HC (Lu, Huchuan); Li, XL (Li, Xuelong)

Source: NEUROCOMPUTING  Volume: 74  Issue: 17  Pages: 2745-2753  DOI: 10.1016/j.neucom.2011.03.047  Published: OCT 2011  

Abstract: In this paper, two dimensional principal components of natural images (2D-PCs) are proposed. Similar to principal components of natural images (1D-PCs), 2D-PCs can also be viewed as fundamental components of human's receptive field because they contain edge-like, bar-like and grating-like patterns. However, compared to 1D-PCs, 2D-PCs are of surprising symmetry, stable regularity, good interpretability, and have little computational complexity in real applications. Then, based on 1D-PCs and 2D-PCs, we design two kinds of statistical texture features (STF(1D) and STF(2D)), and apply them to multi-class facial expression recognition. Numerous experimental results demonstrate that our statistical texture features are better or not worse than other popular features for facial expression recognition. (C) 2011 Elsevier B.V. All rights reserved.

Accession Number: WOS:000296212400005

Author Identifiers:

ISSN: 0925-2312

eISSN: 1872-8286

Record 46 of 209

Title: Supercontinuum generation employing the high-energy wave-breaking-free pulse in a compact all-fiber laser system

Author(s): Wang, LR (Wang, L. R.); Liu, XM (Liu, X. M.); Gong, YK (Gong, Y. K.); Mao, D (Mao, D.); Duan, LN (Duan, L. N.)

Source: LASER PHYSICS  Volume: 21  Issue: 10  Pages: 1797-1803  DOI: 10.1134/S1054660X11170245  Published: OCT 2011  

Abstract: Supercontinuum (SC) generation is experimentally achieved in a compact all-fiber laser system by using high-energy wave-breaking-free dissipative soliton (DS) pulses. The pulses exhibit Gaussian (rectangular) shape profiles in spectral (temporal) domain, which is even reversed of the typical rectangular-spectrum DSs. With the increase of pump power the pulse duration enlarges dramatically whereas the bandwidth and peak power of the pulse keep almost constant, which enables the pulse to accumulate much higher energy during the pulse-shaping process. When inputting the amplified pulse into the single-mode fiber, SC with excellent flatness is generated with the spectral range from about 1550 to 1700 nm. Broader SC with the bandwidth of even larger than 1000 nm can also be generated by this kind of pulse in the near-zero-dispersion-flattened photonic-crystal fiber through strong nonlinear effects.

Accession Number: WOS:000295535700024

Author Identifiers:

ISSN: 1054-660X

Record 47 of 209

Title: Influence of spectral broadening on femtosecond wavelength conversion based on four-wave mixing in silicon waveguides

Author(s): Wang, ZL (Wang, Zhaolu); Liu, HJ (Liu, Hongjun); Huang, N (Huang, Nan); Sun, QB (Sun, Qibing); Wen, J (Wen, Jin)

Source: APPLIED OPTICS  Volume: 50  Issue: 28  Pages: 5430-5436  DOI: 10.1364/AO.50.005430  Published: OCT 1 2011  

Abstract: Femtosecond wavelength conversion in the telecommunication bands via four-wave mixing in a 1.5mm long silicon rib waveguide is theoretically investigated. Compared with picosecond pulses, the spectra are greatly broadened for the femtosecond pulses due to self-phase modulation and cross-phase modulation in the four-wave mixing process, and it is difficult to achieve a wavelength converter when the pump and signal pulse widths are close to or less than 100 fs in the telecommunication bands because of the spectral overlap. The influence of the spectral broadening on the conversion efficiency is also investigated. The conversion bandwidth of 220nm and peak conversion efficiency of -8 dB are demonstrated by using 500 fs pulses with higher efficiency than the picosecond pulse-pumped efficiency when the repetition rate is 100 GHz. (C) 2011 Optical Society of America

Accession Number: WOS:000295842600030

PubMed ID: 22016209

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 48 of 209

Title: Hadamard Transform Spectrometer Mixed Pixels' Unmixing Method

Author(s): Yan, P (Yan Peng); Hu, BL (Hu Bing-liang); Liu, XB (Liu Xue-bin); Sun, W (Sun Wei); Li, LB (Li Li-bo); Feng, YT (Feng Yu-tao); Liu, YZ (Liu Yong-zheng)

Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 31  Issue: 10  Pages: 2870-2873  DOI: 10.3964/j.issn.1000-0593(2011)10-2870-04  Published: OCT 2011  

Abstract: Hadamard transform imaging spectrometer is a multi-channel digital transform spectrometer detection technology, this paper based on digital micromirror array device (DMD) of the Hadamard transform spectrometer working principle and instrument structure, obtained by the imaging sensor mixed pixel were analyzed, theory derived the solution of pixel aliasing hybrid method, simulation results show that the method is simple and effective to improve the accuracy of mixed pixel spectrum more than 10% recovery.

Accession Number: WOS:000295556300060

PubMed ID: 22250574

ISSN: 1000-0593

Record 49 of 209

Title: Solid waste plasma disposal plant

Author(s): Yang, LQ (Yang, Liqing); Wang, HJ (Wang, Haojing); Wang, HF (Wang, Hongfei); Wang, DP (Wang, Dapeng); Wang, Y (Wang, Yue)

Source: JOURNAL OF ELECTROSTATICS  Volume: 69  Issue: 5  Pages: 411-413  DOI: 10.1016/j.elstat.2011.05.007  Published: OCT 2011  

Abstract: This review describes the current status of waste plasma disposal plant. A comprehensive analysis of the available scientific and technical literature on waste plasma disposal plant, including the actual plant design and configuration, operation principle of core facility, the economic viability and floor area of a plasma plant. The case on the development and large scale commercial applications of the solid waste plasma disposal plant should be further research. (C) 2011 Elsevier B.V. All rights reserved.

Accession Number: WOS:000294582600001

Author Identifiers:

ISSN: 0304-3886

Record 50 of 209

Title: Segmentation of retinal blood vessels using the radial projection and semi-supervised approach

Author(s): You, XG (You, Xinge); Peng, QM (Peng, Qinmu); Yuan, Y (Yuan, Yuan); Cheung, YM (Cheung, Yiu-ming); Lei, JJ (Lei, Jiajia)

Source: PATTERN RECOGNITION  Volume: 44  Issue: 10-11  Special Issue: SI  Pages: 2314-2324  DOI: 10.1016/j.patcog.2011.01.007  Published: OCT-NOV 2011  

Abstract: Automatic segmentation of retinal blood vessels has become a necessary diagnostic procedure in ophthalmology. The blood vessels consist of two types of vessels, i.e., thin vessels and wide vessels. Therefore, a segmentation method may require two different processes to treat different vessels. However, traditional segmentation algorithms hardly draw a distinction between thin and wide vessels, but deal with them together. The major problems of these methods are as follows: (1) If more emphasis is placed on the extraction of thin vessels, the wide vessels tend to be over detected; and more artificial vessels are generated, too. (2) If more attention is paid on the wide vessels, the thin and low contrast vessels are likely to be missing. To overcome these problems, a novel scheme of extracting the retinal vessels based on the radial projection and semi-supervised method is presented in this paper. The radial projection method is used to locate the vessel centerlines which include the low-contrast and narrow vessels. Further, we modify the steerable complex wavelet to provide better capability of enhancing vessels under different scales, and construct the vector feature to represent the vessel pixel by line strength. Then, semi-supervised self-training is used for extraction of the major structures of vessels. The final segmentation is obtained by the union of the two types of vessels. Our approach is tested on two publicly available databases. Experiment results show that the method can achieve improved detection of thin vessels and decrease false detection of vessels in pathological regions compared to rival solutions. (C) 2011 Published by Elsevier Ltd.

Accession Number: WOS:000292849000010

Author Identifiers:

ISSN: 0031-3203

eISSN: 1873-5142

Record 51 of 209

Title: Clock drift-tolerant optical bit pattern monitoring technique in asynchronous undersampling system

Author(s): Zhang, HX (Zhang, Huixing); Zhao, W (Zhao, Wei)

Source: OPTICAL ENGINEERING  Volume: 50  Issue: 10  Article Number: 105008  DOI: 10.1117/1.3640828  Published: OCT 2011  

Abstract: Based on an asynchronously undersampling system, we present a novel bit pattern monitoring technique in terms of its performance analysis and the implementation aspects. Relying upon an finite impulse response (FIR) filter assisted fine synchronization of the acquired samples, the technique can significantly reduce the random walk clock drift between data signal and sampling source compared to a conventional fine synchronization using a fixed time step. For the performance analysis of this technique, we first present an intuitive understanding of the principle of the FIR filter method under consideration of the filter frequency response. We find that the frequency response of the FIR filter simply serves to extract the spectral component at the aliasing frequency found in the periodogram and diminish all other frequency components. Then we test the tracking limit and discuss the optimized filter length choice of the new bit pattern monitoring technique through numerical examples. It turns out that the optimal filter length is chosen as the one which minimized the measured jitter and can be found iteratively. Finally, we present an experimental verification of this FIR bit pattern synchronization method by measuring and reconstructing bit patterns of 40 Gb/s nonreturn-to-zero and 160 Gb/s return-to-zero data signals, respectively. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3640828]

Accession Number: WOS:000296559700029

ISSN: 0091-3286

eISSN: 1560-2303

Record 52 of 209

Title: Guiding and Confining Light in Low-Index Circularly Symmetric Waveguides

Author(s): Zhang, WF (Zhang, Wenfu); Mu, JW (Mu, Jian-Wei); Huang, WP (Huang, Wei-Ping); Zhao, W (Zhao, Wei)

Source: IEEE PHOTONICS JOURNAL  Volume: 3  Issue: 5  Pages: 854-860  DOI: 10.1109/JPHOT.2011.2167602  Published: OCT 2011  

Abstract: A circularly symmetric waveguide with a low-index ring inside the core has been proposed and studied comprehensively. By taking advantage of the azimuthal TM01 mode, the structure can confine light inside the low-index region with very high power confinement efficiency. Key characteristic parameters as functions of geometry factors have been investigated through rigorous finite-difference methods. The fabrication tolerance and the material candidate for various potential applications have been discussed.

Accession Number: WOS:000295446800004

Author Identifiers:

ISSN: 1943-0655

Record 53 of 209

Title: Optical bistability in metal-insulator-metal plasmonic waveguide with nanodisk resonator containing Kerr nonlinear medium

Author(s): Wang, GX (Wang, Guoxi); Lu, H (Lu, Hua); Liu, XM (Liu, Xueming); Gong, YK (Gong, Yongkang); Wang, LR (Wang, Leiran)

Source: APPLIED OPTICS  Volume: 50  Issue: 27  Pages: 5287-5290  DOI: 10.1364/AO.50.005287  Published: SEP 20 2011  

Abstract: We numerically investigate the optical bistability effect in the metal-insulator-metal waveguide with a nanodisk resonator containing a Kerr nonlinear medium. It is found that the increase of the refractive index, which is induced by enhancing the incident intensity, can cause a redshift for the resonance wavelength. The local resonant field excited in the nanodisk cavity can significantly increase the Kerr nonlinear effect. In addition, an obvious bistability loop is observed in the proposed structure. This nonlinear structure can find important applications for all-optical switching in highly integrated optical circuits. (C) 2011 Optical Society of America

Accession Number: WOS:000295028000010

PubMed ID: 21947047

Author Identifiers: