Record 1 of 157

Title: Dynamic evolution of temporal dissipative-soliton molecules in large normal path-averaged dispersion fiber lasers

Author(s): Liu, XM (Liu, Xueming)

Source: PHYSICAL REVIEW A  Volume: 82  Issue: 6  Article Number: 063834  DOI: 10.1103/PhysRevA.82.063834  Published: DEC 28 2010  

Abstract: The robust dissipative soliton molecules (DSM's) exhibiting as the quasirectangular spectral profile are investigated numerically and observed experimentally in mode-locked fiber lasers with the large normal path-averaged dispersion and the large net cavity dispersion. These DSM's have an independently evolving phase with a pulse duration T-0 of about 20 ps and a peak-to-peak separation of about 8T(0). Under laboratory conditions, the proposed laser delivers vibrating DSM's with an oscillating amplitude of less than a percent of peak separation. Numerical simulations show that DSM's are characterized by a spectral modulation pattern with about a 3-dB modulation depth measured as an averaged value. The experimental observations are in excellent agreement with the numerical predictions.

Accession Number: WOS:000286746000013

Author Identifiers:

ISSN: 1050-2947

eISSN: 1094-1622

Record 2 of 157

Title: Electron spin dynamics in heavily Mn-doped (Ga,Mn)As

Author(s): Zhu, YG (Zhu, Yonggang); Han, LF (Han, Lifen); Chen, L (Chen, Lin); Zhang, XH (Zhang, Xinhui); Zhao, JH (Zhao, Jianhua)

Source: APPLIED PHYSICS LETTERS  Volume: 97  Issue: 26  Article Number: 262109  DOI: 10.1063/1.3531754  Published: DEC 27 2010  

Abstract: Electron spin relaxation and related mechanisms in heavily Mn-doped (Ga,Mn) As are studied by performing time-resolved magneto-optical Kerr effect measurements. At low temperature, s-d exchange scattering dominates electron spin relaxation, whereas the Bir-Aronov-Pikus mechanism and Mn impurity scattering play important roles at high temperature. The temperature-dependent spin relaxation time exhibits an anomaly around the Curie temperature (T-c) that implies that thermal fluctuation is suppressed by short-range correlated spin fluctuation above T-c. (C) 2010 American Institute of Physics. [doi:10.1063/1.3531754]

Accession Number: WOS:000285768100035

Author Identifiers:

ISSN: 0003-6951

eISSN: 1077-3118

Record 3 of 157

Title: Azimuthons in weakly nonlinear waveguides of different symmetries

Author(s): Zhang, YQ (Zhang, Yiqi); Skupin, S (Skupin, Stefan); Maucher, F (Maucher, Fabian); Pour, AG (Pour, Arpa Galestian); Lu, KQ (Lu, Keqing); Królikowski, W (Krolikowski, Wieslaw)

Source: OPTICS EXPRESS  Volume: 18  Issue: 26  Pages: 27846-27857  DOI: 10.1364/OE.18.027846  Published: DEC 20 2010  

Abstract: We show that weakly guiding nonlinear waveguides support stable propagation of rotating spatial solitons (azimuthons). We investigate the role of waveguide symmetry on the soliton rotation. We find that azimuthons in circular waveguides always rotate rigidly during propagation and the analytically predicted rotation frequency is in excellent agreement with numerical simulations. On the other hand, azimuthons in square waveguides may experience spatial deformation during propagation. Moreover, we show that there is a critical value for the modulation depth of azimuthons above which solitons just wobble back and forth, and below which they rotate continuously. We explain these dynamics using the concept of energy difference between different orientations of the azimuthon. (C) 2010 Optical Society of America

Accession Number: WOS:000285584200062

PubMed ID: 21197058

Author Identifiers:

ISSN: 1094-4087

Record 4 of 157

Title: The effect of added O₂ on the transmittance and radiation resistance of radiation resistant glasses

Author(s): Li, WN (Li, Weinan); Lu, M (Lu, Min)

Source: OPTICS EXPRESS  Volume: 18  Issue: 25  Pages: 26307-26312  DOI: 10.1364/OE.18.026307  Published: DEC 6 2010  

Abstract: One method of hardening optical glasses against radiation-induced darkening has been to add CeO2 to the batch composition. In the present investigation we prepared a series of lanthanum crown glasses with varying degrees of CeO2 additions and melted them at 1,400 degrees C with and without bubbling oxygen gas. We examined the influence of added oxygen on the optical transmissions of these glasses in the spectral range 460 to 760 nm following gamma irradiations ranging from 10 to 250 krad. The results showed that dose-for-dose the radiation-induced optical attenuations of the oxidized glasses were greater than for the glasses without added O-2. (C)2010 Optical Society of America

Accession Number: WOS:000285749500088

PubMed ID: 21164980

Author Identifiers:

ISSN: 1094-4087

Record 5 of 157

Title: PERFORMANCE OF DOUBLE SIDEBAND MODULATED PROBE WAVE IN BOTDA DISTRIBUTED FIBER SENSOR

Author(s): Cui, QS (Cui, Qingsong); Pamukcu, S (Pamukcu, Sibel); Lin, AX (Lin, Aoxiang); Xiao, W (Xiao, Wen); Toulouse, J (Toulouse, Jean)

Source: MICROWAVE AND OPTICAL TECHNOLOGY LETTERS  Volume: 52  Issue: 12  Pages: 2713-2717  DOI: 10.1002/mop.25566  Published: DEC 2010  

Abstract: We report on the performance of double sideband (DSB) modulated probe wave in Brillouin optical time domain analysis (BOTDA) distributed fiber sensor. Compared to single sideband (SSB) modulation, along the sensing fiber the pump depletion of DSB modulation is remarkably suppressed in time domain and also has a relatively narrower Brillouin gain spectrum in frequency domain. Both the theoretical simulation and the experimental results demonstrate that the DSB modulation provides potentially longer sensing distance and higher accuracy in measurement than the SSB modulation in the BOTDA distributed fiber sensor system. (C) 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2713-2717,2010: View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25566

Accession Number: WOS:000283757500024

Author Identifiers:

ISSN: 0895-2477

Record 6 of 157

Title: Local histogram based geometric invariant image watermarking

Author(s): Deng, C (Deng, Cheng); Gao, XB (Gao, Xinbo); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng)

Source: SIGNAL PROCESSING  Volume: 90  Issue: 12  Pages: 3256-3264  DOI: 10.1016/j.sigpro.2010.05.032  Published: DEC 2010  

Abstract: Compared with other existing methods, the feature point-based image watermarking schemes can resist to global geometric attacks and local geometric attacks, especially cropping and random bending attacks (RBAs), by binding watermark synchronization with salient image characteristics. However, the watermark detection rate remains low in the current feature point-based watermarking schemes. The main reason is that both of feature point extraction and watermark embedding are more or less related to the pixel position, which is seriously distorted by the interpolation error and the shift problem during geometric attacks. In view of these facts, this paper proposes a geometrically robust image watermarking scheme based on local histogram. Our scheme mainly consists of three components: (1) feature points extraction and local circular regions (LCRs) construction are conducted by using Harris-Laplace detector; (2) a mechanism of grapy theoretical clustering-based feature selection is used to choose a set of non-overlapped LCRs, then geometrically invariant LCRs are completely formed through dominant orientation normalization; and (3) the histogram and mean statistically independent of the pixel position are calculated over the selected LCRs and utilized to embed watermarks. Experimental results demonstrate that the proposed scheme can provide sufficient robustness against geometric attacks as well as common image processing operations. (C) 2010 Elsevier B.V. All rights reserved.

Accession Number: WOS:000280986000021

Author Identifiers:

ISSN: 0165-1684

eISSN: 1872-7557

Record 7 of 157

Title: Study on Spectral Broadened Characterization of Cross Phase Modulation in Photonic Crystal Fiber

Author(s): Hui, ZQ (Hui Zhan-qiang); Zhang, JG (Zhang Jian-guo)

Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 30  Issue: 12  Pages: 3295-3301  DOI: 10.3964/j.issn.1000-0593(2010)12-3295-07  Published: DEC 2010  

Abstract: Spectrum broadening induced by cross phase modulation (XPM) was investigated by exploiting the optical time-division multiplexing (OTDM) data signal and continue wave probe light co-propagation in dispersion flattened high nonlinear photonic crystal fiber (PCF). The effects of wavelength drift of probe lights, polarization mismatch, total power and power ration of pump and probe light on the spectrum broadening were analyzed. The results show that good XPM effects can be obtained in 36 nm wavelength range when the total power is higher than 23 dB, power ration of pump and probe light is appropriate and with identical polarization. Furthermore, polarization independent XPM effect can be achieved by using the remainder birefringence of the PCF with the pump state of polarization (SOP) aligned at 45 degrees to the PCF principal axes. The obtained results in this paper would be helpful for research on ultrahigh-speed all optical signal processing devices exploiting the XPM in PCF for future photonics network

Accession Number: WOS:000284987600029

PubMed ID: 21322226

ISSN: 1000-0593

Record 8 of 157

Title: Total-internal-reflection fluorescence microscopy with W-shaped axicon mirrors

Author(s): Lei, M (Lei, Ming); Zumbusch, A (Zumbusch, Andreas)

Source: OPTICS LETTERS  Volume: 35  Issue: 23  Pages: 4057-4059  DOI: 10.1364/OL.35.004057  Published: DEC 1 2010  

Abstract: A scheme based on a W-shaped axicon mirror device for total-internal-reflection fluorescence microscopy (TIRFM) is presented. This approach combines the advantages of higher efficiency compared with traditional TIRFM, adjustable illumination area, and simple switching between wide-field and TIRF imaging modes. TIRF images obtained with this approach are free of shadow artifacts and of interference fringes. Example micrographs of fluorescently labeled polystyrene beads, of Convallaria majalis tissue, and of Propidium-iodide-labeled Chinese hamster ovary cells are shown, and the capabilities of the scheme are discussed. (C) 2010 Optical Society of America

Accession Number: WOS:000284832200067

PubMed ID: 21124611

Author Identifiers:

ISSN: 0146-9592

eISSN: 1539-4794

Record 9 of 157

Title: Vectorial structure of a hard-edged-diffracted four-petal Gaussian beam in the far field

Author(s): Long, XW (Long, Xuewen); Lu, KQ (Lu, Keqing); Zhang, YH (Zhang, Yuhong); Guo, JB (Guo, Jianbang); Li, KH (Li, Kehao)

Source: OPTICS COMMUNICATIONS  Volume: 283  Issue: 23  Pages: 4586-4593  DOI: 10.1016/j.optcom.2010.06.097  Published: DEC 1 2010  

Abstract: Based on the vector angular spectrum method and the stationary phase method and the fact that a circular aperture function can be expanded into a finite sum of complex Gaussian functions, the analytical vectorial structure of a four-petal Gaussian beam (FPGB) diffracted by a circular aperture is derived in the far field The energy flux distributions and the diffraction effect introduced by the aperture are studied and illustrated graphically. Moreover, the influence of the f-parameter and the truncation parameter on the non-paraxiality is demonstrated in detail. In addition, the approximate formulas obtained in this paper can degenerate into un-apertured case when the truncation parameter tends to infinity. This work is beneficial to strengthen the understanding of vectorial properties of the FPGB diffracted by a circular aperture. (C) 2010 Elsevier B V All rights reserved

Accession Number: WOS:000283704800006

ISSN: 0030-4018

eISSN: 1873-0310

Record 10 of 157

Title: Gray photorefractive polymeric optical spatial solitons

Author(s): Lu, KQ (Lu, Keqing); Li, KH (Li, Kehao); Zhang, YP (Zhang, Yanpeng); Yuan, CZ (Yuan, Chenzhi); Miao, CY (Miao, Changyun); Chen, L (Chen, Li); Xu, JJ (Xu, Jingjun)

Source: OPTICS COMMUNICATIONS  Volume: 283  Issue: 23  Pages: 4741-4748  DOI: 10.1016/j.optcom.2010.06.102  Published: DEC 1 2010  

Abstract: We show that gray spatial optical solitons are possible in biased photorefractive polymers under steady-state conditions. We find that for a given material parameter the absolute value of a gray photorefractive polymeric soliton's phase decreases with an increase in the beam's grayness, whereas it increases with the material parameter for a given beam's grayness and that the full width half maximum (FWHM) of the gray soliton beam's intensity increases with the beam's grayness when the normalized background intensity and the material parameter are fixed and decreases with an increase in the normalized background intensity when the material parameter is fixed. On the other hand, we also show that N coupled beam evolution equations in biased photorefractive polymers can exhibit multicomponent gray solitons. These multicomponent gray solitons can be obtained provided that the N coupled beams share the same polarization, wavelength, and are incoherent with one another. The characteristics and stability properties of these multicomponent gray solitons arc also discussed in detail. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved

Accession Number: WOS:000283704800031

Author Identifiers:

ISSN: 0030-4018

Record 11 of 157

Title: Parallel phase-shifting interferometry based on Michelson-like architecture

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

Source: APPLIED OPTICS  Volume: 49  Issue: 34  Pages: 6612-6616  DOI: 10.1364/AO.49.006612  Published: DEC 1 2010  

Abstract: In this paper, we present a new scheme for parallel phase-shifting interferometry that employs a Michelson-like architecture and a simple polarization unit to generate two phase-shifting interferograms with phase shift of pi/2 at a single camera exposure. The parallel phase-shifting unit is built with simple optical components, and the distance between the parallel interferograms can be adjusted conveniently. Phase reconstruction is performed by using an algorithm developed for two-step phase-shifting interferometry. The practicability of the proposed configuration and the reconstruction method is demonstrated by experiments. (C) 2010 Optical Society of America

Accession Number: WOS:000284830500015

PubMed ID: 21124538

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 12 of 157

Title: Visual-Context Boosting for Eye Detection

Author(s): Song, ML (Song, Mingli); Tao, DC (Tao, Dacheng); Sun, Z (Sun, Zhuo); Li, XL (Li, Xuelong)

Source: IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS  Volume: 40  Issue: 6  Pages: 1460-1467  DOI: 10.1109/TSMCB.2010.2040078  Published: DEC 2010  

Abstract: Eye detection plays an important role in many practical applications. This paper presents a novel two-step scheme for eye detection. The first step models an eye by a newly defined visual-context pattern (VCP), and the second step applies semisupervised boosting for precise detection. VCP describes both the space and appearance relations between an eye region (region of eye) and a reference region (region of reference). The context feature of a VCP is extracted by using the integral image. Aiming to reduce the human labeling efforts, we apply semisupervised boosting, which integrates the context feature and the Haar-like features for precise eye detection. Experimental results on several standard face data sets demonstrate that the proposed approach is effective, robust, and efficient. We finally show that this approach is ready for practical applications.

Accession Number: WOS:000284364400004

PubMed ID: 20172830

Author Identifiers:

ISSN: 1083-4419

eISSN: 1941-0492

Record 13 of 157

Title: Spectral property of two-photon flux generated by four-photon scattering in photonic-crystal fibers

Author(s): Sun, HB (Sun, Hongbo); Liu, XM (Liu, Xueming); Hu, XH (Hu, Xiaohong); Li, XH (Li, Xiaohui)

Source: OPTICAL ENGINEERING  Volume: 49  Issue: 12  Article Number: 125001  DOI: 10.1117/1.3516732  Published: DEC 2010  

Abstract: Based on the scalar four-photon scattering process, the quantum state of a lightwave at the output of fiber is derived by solving the nonlinear Schrodinger equation with a perturbation theory. The joint spectral function of two photons is achieved from the derived quantum state. The dispersion operator involves the third-order dispersion term in the case that the pump wavelength is close to the zero dispersion wavelength. Simulation results show the first-order approximation of our joint spectral function is in excellent agreement with the complicated exact solution. By analyzing the spectral property of the two-photon flux generated by four-photon scattering in photonic-crystal fibers, it is found that the sign of dispersion has very little influence on the spectrum except the slight modulation instability in the anomalous dispersion domain. (c) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3516732]

Accession Number: WOS:000285749600019

Author Identifiers:

ISSN: 0091-3286

Record 14 of 157

Title: In-Depth Study on Propane-Air Combustion Enhancement With Dielectric Barrier Discharge

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

Source: IEEE TRANSACTIONS ON PLASMA SCIENCE  Volume: 38  Issue: 12  Special Issue: SI  Pages: 3272-3281  DOI: 10.1109/TPS.2010.2084597  Part: 1  Published: DEC 2010  

Abstract: Low-temperature plasmas generated from dielectric barrier discharges (DBDs) play an important role in hydrocarbon combustion reactions. In this paper, two different arrangements of coaxial cylindrical DBD reactors are designed to investigate the enhancement processes of plasma-assisted propane combustion through activating propane and air, respectively. Each reactor corresponds to one kind of activation method. With plasma being on and off, the physical appearances of the propane combustion flame are observed and compared, and the spatial distributions of the flame temperature are measured and comparatively investigated under each activation approach. In addition, some major components such as OH, CH, and C-2 in the combustion flame are identified using flame/plasma emission spectroscopy. The relationship of OH radical concentration with flame position is studied when plasma is on and off, and concentration profiles as well as densities of these major components in the main combustion zone are qualitatively measured and analyzed. Possible physical and chemical reaction mechanisms in the plasma and flame zones are discussed in detail under both activation ways. Experimental results suggest that propane combustion be enhanced with plasma applied on either propane or air stream. A temperature rise of about 30 degrees C is achieved for the activation of propane, but about 50 degrees C is achieved for the activation of air with a 30-W plasma being applied. It denotes that some active species like O-atoms, N-atoms, and excited molecular oxygen and nitrogen produced by activating air components play a greater role than those smaller fragments and radicals generated by cracking propane in plasma-assisted combustion in our experimental conditions.

Accession Number: WOS:000285247500003

ISSN: 0093-3813

eISSN: 1939-9375

Record 15 of 157

Title: Incremental pairwise discriminant analysis based visual tracking

Author(s): Wen, J (Wen, Jing); Gao, XB (Gao, Xinbo); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng); Li, J (Li, Jie)

Source: NEUROCOMPUTING  Volume: 74  Issue: 1-3  Special Issue: SI  Pages: 428-438  DOI: 10.1016/j.neucom.2010.07.014  Published: DEC 2010  

Abstract: The distinguishment between the object appearance and the background is the useful cues available for visual tracking in which the discriminant analysis is widely applied However due to the diversity of the background observation there are not adequate negative samples from the background which usually lead the discriminant method to tracking failure Thus a natural solution is to construct an object-background pair constrained by the spatial structure which could not only reduce the neg-sample number but also make full use of the background information surrounding the object However this Idea is threatened by the variant of both the object appearance and the spatial-constrained background observation especially when the background shifts as the moving of the object Thus an Incremental pairwise discriminant subspace is constructed in this paper to delineate the variant of the distinguishment In order to maintain the correct the ability of correctly describing the subspace we enforce two novel constraints for the optimal adaptation (1) pairwise data discriminant constraint and (2) subspace smoothness The experimental results demonstrate that the proposed approach can alleviate adaptation drift and achieve better visual tracking results for a large variety of nonstationary scenes (C) 2010 Elsevier B V All rights reserved

Accession Number: WOS:000285805800040

Author Identifiers:

ISSN: 0925-2312

eISSN: 1872-8286

Record 16 of 157

Title: High-birefringence negative dispersion effect of novel rectangular lattice photonic crystal fiber

Author(s): Zhang, YN (Zhang Ya-Ni)

Source: ACTA PHYSICA SINICA  Volume: 59  Issue: 12  Pages: 8632-8639  DOI: 10.7498/aps.59.8632  Published: DEC 2010  

Abstract: A novel rectangular lattice photonic crystal fiber is proposed which is composed of a central defect core and a cladding with square mesh structure by introducing another air hole row between two air hole rows for every other line into a conventional rectangular lattice photonic crystal fiber. Its dispersion, birefringence and confinement loss are numerically investigated by full vector finite element method with anisotropic perfectly matched layers. Numerical results indicate that the proposed fiber shows higher birefringence negative dispersion effect and stronger confinement ability of guided mode, in which the confinement loss is lower than 10(-2) dB.m(-1). The wavelength for high birefringence negative dispersion can be optimized by adjusting the parameters of proposed fiber, such as Lambda and d/Lambda. The dispersion and the dispersion slope are both negative, the birefringence is higher than 10(-2), and nonlinear parameter is close to 55 km(-1) W-1 over C band (i. e. 1.53-1.565 mu m) under the condition of Lambda = 2.0 mu m and d/Lambda = 0.4. This fiber will have important applications in the fields of polarization maintaining transmission system and dispersion compensation, and also in the design of widely tunable wavelength converter based on four-wave mixing.

Accession Number: WOS:000286689500046

Author Identifiers:

ISSN: 1000-3290

Record 17 of 157

Title: Nanosize structural modifications with polarization functions in ultrafast laser irradiated bulk fused silica

Author(s): Mishchik, K (Mishchik, K.); Cheng, G (Cheng, G.); Huo, G (Huo, G.); Burakov, IM (Burakov, I. M.); Mauclair, C (Mauclair, C.); Mermillod-Blondin, A (Mermillod-Blondin, A.); Rosenfeld, A (Rosenfeld, A.); Ouerdane, Y (Ouerdane, Y.); Boukenter, A (Boukenter, A.); Parriaux, O (Parriaux, O.); Stoian, R (Stoian, R.)

Source: OPTICS EXPRESS  Volume: 18  Issue: 24  Pages: 24809-24824  DOI: 10.1364/OE.18.024809  Published: NOV 22 2010  

Abstract: Laser-induced self-organization of regular nanoscale layered patterns in fused silica is investigated using spectroscopy and microscopy methods, revealing a high presence of stable broken oxygen bonds. Longitudinal traces are then generated by replicating static irradiation structures where the nanoscale modulation can cover partially or completely the photoinscribed traces. The resulting birefringence, the observed anisotropic light scattering properties, and the capacity to write and erase modulated patterns can be used in designing bulk polarization sensitive devices. Various laser-induced structures with optical properties combining guiding, scattering, and polarization sensitivity are reported. The attached polarization functions were evaluated as a function of the fill factor of the nanostructured domains. The polarization sensitivity allows particular light propagation and confinement properties in three dimensional structures. (C) 2010 Optical Society of America

Accession Number: WOS:000285586800045

PubMed ID: 21164827

Author Identifiers:

ISSN: 1094-4087

Record 18 of 157

Title: Mechanism of high-energy pulse generation without wave breaking in mode-locked fiber lasers

Author(s): Liu, XM (Liu, Xueming)

Source: PHYSICAL REVIEW A  Volume: 82  Issue: 5  Article Number: 053808  DOI: 10.1103/PhysRevA.82.053808  Published: NOV 10 2010  

Abstract: The mechanism and intrinsic conditions of high-energy wave-breaking-free pulse generation in fiber lasers mode-locked by a nonlinear polarization rotation technique are investigated numerically and experimentally. Both numerical and experimental results show that the pulses along the two orthogonal polarization axes of the fiber have a large difference in pulse energy. The numerical simulations show that the ratio of the energy of two components is limited and ranges from about 8 to about 65. The slope of the instantaneous frequency at the central position of the pulse decreases rapidly with the increase of the pulse duration and energy, whereas the slope at the pulse edge changes slightly. The accumulation of instantaneous frequency throughout the pulse width approaches a constant in a higher pulse energy regime. Understanding the mechanism and intrinsic conditions of the wave-breaking-free pulse generation could be useful in generating high-energy pulses delivered from fiber lasers.

Accession Number: WOS:000284044500014

Author Identifiers:

ISSN: 1050-2947

eISSN: 1094-1622

Record 19 of 157

Title: An integrated aurora image retrieval system: AuroraEye

Author(s): Fu, R (Fu, Rong); Gao, XB (Gao, Xinbo); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng); Jian, YJ (Jian, Yongjun); Li, J (Li, Jie); Hu, HQ (Hu, Hongqiao); Yang, HG (Yang, Huigen)

Source: JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION  Volume: 21  Issue: 8  Pages: 787-797  DOI: 10.1016/j.jvcir.2010.06.002  Published: NOV 2010  

Abstract: With the digital all-sky imager (ASI) emergence in aurora research, millions of images are captured annually. However, only a fraction of which can be actually used. To address the problem incurred by low efficient manual processing, an integrated image analysis and retrieval system is developed. For precisely representing aurora image, macroscopic and microscopic features are combined to describe aurora texture. To reduce the feature dimensionality of the huge dataset, a modified local binary pattern (LBP) called ALBP is proposed to depict the microscopic texture, and scale-invariant Gabor and orientation-invariant Gabor are employed to extract the macroscopic texture. A physical property of aurora is inducted as region features to bridge the gap between the low-level visual features and high-level semantic description. The experiments results demonstrate that the ALBP method achieves high classification rate and low computational complexity. The retrieval simulation results show that the developed retrieval system is efficient for huge dataset. (c) 2010 Elsevier Inc. All rights reserved.

Accession Number: WOS:000283827500003

Author Identifiers:

ISSN: 1047-3203

eISSN: 1095-9076

Record 20 of 157

Title: High birefringent rhombic-hole photonic crystal fibers

Author(s): Hu, B (Hu, Bin); Lu, M (Lu, Min); Li, WN (Li, Weinan); Zou, KS (Zou, Kuaisheng); Zhou, ZG (Zhou, Zhiguang); Lin, AX (Lin, Aoxiang); Li, N (Li, Ning)

Source: APPLIED OPTICS  Volume: 49  Issue: 31  Pages: 6098-6101  DOI: 10.1364/AO.49.006098  Published: NOV 1 2010  

Abstract: High birefringence induced by rhombic air-hole photonic crystal fibers (PCFs) is numerically analyzed by using the finite-element method. The birefringence of a few kinds of PCFs was investigated with different parameters related to rhombic holes, including the rhombic-hole shape, size, and spacing. It was found that the birefringence of the proposed rhombic-hole PCF in this study is relatively larger than that of an elliptical-hole PCF with the same air-filling fraction (f = 0.0375) when the ratio of the rhombic-hole diagonal length is equal to the elliptical-hole ellipticity. (C) 2010 Optical Society of America

Accession Number: WOS:000283653000042

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 21 of 157

Title: Primary scientific results of Chang'E-1 lunar mission

Author(s): Ouyang, ZY (Ouyang ZiYuan); Li, CL (Li ChunLai); Zou, YL (Zou YongLiao); Zhang, HB (Zhang HongBo); Lü, C (Lue Chang); Liu, JZ (Liu JianZhong); Liu, JJ (Liu JianJun); Zuo, W (Zuo Wei); Su, Y (Su Yan); Wen, WB (Wen WeiBin); Bian, W (Bian Wei); Zhao, BC (Zhao BaoChang); Wang, JY (Wang JianYu); Yang, JF (Yang JianFeng); Chang, J (Chang Jin); Wang, HY (Wang HuanYu); Zhang, XH (Zhang XiaoHui); Wang, SJ (Wang ShiJin); Wang, M (Wang Min); Ren, X (Ren Xin); Mu, LL (Mu LingLi); Kong, DQ (Kong DeQing); Wang, XQ (Wang XiaoQian); Wang, F (Wang Fang); Geng, LA (Geng Liang); Zhang, ZB (Zhang ZhouBin); Zheng, L (Zheng Lei); Zhu, XY (Zhu XinYing); Zheng, YC (Zheng YongChun); Li, JD (Li JunDuo); Zou, XD (Zou XiaoDuan); Xu, C (Xu Chun); Shi, SB (Shi ShuoBiao); Gao, YF (Gao YiFei); Gao, GN (Gao GuanNan)

Source: SCIENCE CHINA-EARTH SCIENCES  Volume: 53  Issue: 11  Pages: 1565-1581  DOI: 10.1007/s11430-010-4056-2  Published: NOV 2010  

Abstract: The strategic plan for the development of the unmanned Chinese Lunar Exploration Program is characterized by three distinct stages: "orbiting around", "landing on" and "returning from" the Moon. The first Chinese lunar probe, Chang'E-1, which was successfully launched on October 24th, 2007 at Xichang Satellite Launch Center, and guided to crash on the Moon on March 1st, 2009, at 52.36A degrees E, 1.50A degrees S, in the north of Mare Fecunditatis, is the first step towards the "orbiting around" stage. The Chang'E-1 mission lasted 495 days, exceeding the expected life-span by about four months. A total of 1.37 TB raw data was received from Chang'E-1. It was then processed into 4 TB scientific data products at various levels. Many scientific results have been obtained by analyzing these data, including especially the "global lunar image from the first Chinese lunar exploration mission". All scientific goals of Chang'E-1 have been achieved. It provides much useful materials for further advances of lunar sciences and planetary chemistry. Meanwhile, these results will serve as a firm basis for future Chinese lunar missions.

Accession Number: WOS:000284167800001

Author Identifiers:

ISSN: 1674-7313

Record 22 of 157

Title: Spacing-tunable multi-wavelength fiber laser based on cascaded four-wave mixing in highly nonlinear photonic-crystal fiber

Author(s): Sun, HB (Sun, H. B.); Liu, XM (Liu, X. M.); Wang, LR (Wang, L. R.); Li, XH (Li, X. H.); Mao, D (Mao, D.)

Source: LASER PHYSICS  Volume: 20  Issue: 11  Pages: 1994-2000  DOI: 10.1134/S1054660X10210115  Published: NOV 2010  

Abstract: A multi-wavelength fiber laser based on the cascaded four-wave mixing in highly-nonlinear photonic-crystal fiber is proposed and investigated. The cascade operation is initiated by two strong pump waves boosted by multi-mode pumping erbium/ytterbium co-doped double-cladding fiber amplification technique. A segment of highly-nonlinear near-zero-dispersion-flattened photonic crystal fiber is employed to induce highly efficient cascaded four-wave mixing. The wavelength spacing can be continuously tunable by stretching the fiber Bragg grating. Experimental results show that multiple wavelengths with a high optical side-mode suppression-ratio of > 30 dB are achieved. Furthermore, the proposed multi-wavelength fiber laser exhibits an excellent stability at room temperature.

Accession Number: WOS:000284141000014

Author Identifiers:

ISSN: 1054-660X

Record 23 of 157

Title: Second-harmonic generation from a periodic array of noncentrosymmetric nanoholes

Author(s): Zhou, RL (Zhou, Renlong); Lu, H (Lu, Hua); Liu, XM (Liu, Xueming); Gong, YK (Gong, Yongkang); Mao, D (Mao, Dong)

Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS  Volume: 27  Issue: 11  Pages: 2405-2409  DOI: 10.1364/JOSAB.27.002405  Published: NOV 2010  

Abstract: Second-harmonic generation (SHG) through a proposed thin gold film with a periodic array of subwavelength nanoholes is numerically investigated. By using a recently developed microscopic classical theory and a full-vectorial three-dimensional finite-difference time-domain method, we demonstrate that the mirror symmetry of nanoholes in one direction restricts the polarization state of second-harmonic emission in the same direction. Numerical results show that the second-order nonlinear susceptibility chi((2))(yyy) dominates in the process of SHG when the nanoholes possess mirror symmetry in the x-axis direction. It is also found that the surface plasmon resonance can result in the enhancement of SHG from metallic nanoholes. (C) 2010 Optical Society of America

Accession Number: WOS:000283778900044

Author Identifiers:

ISSN: 0740-3224

eISSN: 1520-8540

Record 24 of 157

Title: Tb<SUP>3+</SUP>/Yb<SUP>3+</SUP> heavily-doped tellurite glasses with efficient green light emission

Author(s): Zhou, ZG (Zhou, Zhiguang); Lin, AX (Lin, Aoxiang); Guo, HT (Guo, Haitao); Liu, XM (Liu, Xueming); Hou, CQ (Hou, Chaoqi); Lu, M (Lu, Min); Wei, W (Wei, Wei); Peng, B (Peng, Bo); Zhao, W (Zhao, Wei); Toulouse, J (Toulouse, Jean)

Source: JOURNAL OF NON-CRYSTALLINE SOLIDS  Volume: 356  Issue: 50-51  Pages: 2896-2899  DOI: 10.1016/j.jnoncrysol.2010.09.010  Published: NOV 2010  

Abstract: Without introducing concentration quenching phenomenon a few wt % of Tb3+ and Yb3+ ions were doped into a group of easily-fiberized tellunte glasses characterized by loose polyhedron structures and rich interstitial positions Intense green upconversion emission from Tb3+ ions centered at 539 nm due to transition D-5(4) -> F-7(5) was observed by direct excitation of Yb3+ ions with a laser diode at 976 nm Optimizing the concentration ratio of Tb3+/Yb3+ a tellunte glass with a composition of 80TeO(2)-10ZnO-10Na(2)O (mol%) + 1 0 wt % Tb2O3 + 3 0 wt % Yb2O3 was found to present the highest green light intensity and therefore is especially suitable for efficient green fiber laser development (C) 2010 Elsevier BV All rights reserved

Accession Number: WOS:000285660800036

Author Identifiers:

ISSN: 0022-3093

Record 25 of 157

Title: Third-order nonlinear optical properties of GeS₂-Sb₂S₃-CdS chalcogenide glasses

Author(s): Guo, HT (Guo, Haitao); Hou, CQ (Hou, Chaoqi); Gao, F (Gao, Fei); Lin, AX (Lin, Aoxiang); Wang, PF (Wang, Pengfei); Zhou, ZG (Zhou, Zhiguang); Lu, M (Lu, Min); Wei, W (Wei, Wei); Peng, B (Peng, Bo)

Source: OPTICS EXPRESS  Volume: 18  Issue: 22  Pages: 23275-23284  DOI: 10.1364/OE.18.023275  Published: OCT 25 2010  

Abstract: The third-order nonlinear optical properties of GeS2-Sb2S3-CdS chalcogenide glasses were investigated utilizing the Z-scan and femtosecond time-resolved optical Kerr effect (OKE) methods at the wavelength of 800nm, respectively. The compositional dependences were analyzed and the influencing factors including the linear refractive index, the concentration of lone electron pairs, the optical bandgap and the amount of weak covalent/ homopolar bonds were discussed. A glass, i.e. 76GeS(2)center dot 19Sb(2)S(3 center dot)5CdS, with large nonlinear refrative index (n(2) = 5.63 x 10(-14) cm(2)/W), low nonlinear absorption coefficient (beta = 0.88 cm/GW) and minimum figure of merit (FOM = 2 beta lambda/n(2) = 2.51) was finally prepared. The electronic contribution in weak heterpolar covalent and homopolar bonds are responsible for large n(2) in chalcogenide glass, and the Sheik-Bahae rule combining the Moss rule are proved to be an effective guidance for estimating the third-order nonlinearities and further optimizing the compositions in chalcogenide glasses. (C) 2010 Optical Society of America

Accession Number: WOS:000283560400068

PubMed ID: 21164668

Author Identifiers:

ISSN: 1094-4087

Record 26 of 157

Title: Generation and amplification of high-energy nanosecond pulses in a compact all-fiber laser

Author(s): Mao, D (Mao, Dong); Liu, XM (Liu, Xueming); Wang, LR (Wang, Leiran); Lu, H (Lu, Hua); Feng, HA (Feng, Huan)

Source: OPTICS EXPRESS  Volume: 18  Issue: 22  Pages: 23024-23029  DOI: 10.1364/OE.18.023024  Published: OCT 25 2010  

Abstract: We have experimentally investigated high-energy rectangular pulses delivering from an erbium-doped fiber laser operating in ultra-large net-negative-dispersion regime. The laser oscillator emits rectangular pulses with approximately Gaussian spectral profiles, adjustable nanoseconds durations, and multi-ten nanojoule energies. The outputted pulses can be further amplified to over 2 mu J without distortion by a two-stage erbium-doped fiber amplifier. Thus, rectangular pulses with controllable durations and energies can be achieved from the compact all-fiber fiber laser system. (C) 2010 Optical Society of America

Accession Number: WOS:000283560400042

PubMed ID: 21164642

Author Identifiers:

ISSN: 1094-4087

Record 27 of 157

Title: Simulation and optimization of spatial light modulation of twisted-nematic liquid crystal display

Author(s): Ma, BH (Ma, Baiheng); Yao, BL (Yao, Baoli); Yan, SH (Yan, Shaohui); Peng, F (Peng, Fei); Min, JW (Min, Junwei); Lei, M (Lei, Ming); Ye, T (Ye, Tong)

Source: CHINESE OPTICS LETTERS  Volume: 8  Issue: 10  Special Issue: SI  Pages: 960-963  DOI: 10.3788/COL20100810.0960  Published: OCT 10 2010  

Abstract: The approaches to obtaining desired intensity or phase modulation by twisted-nematic liquid crystal display (TN-LCD) have been extensively studied based on the knowledge of the LCD's internal structure parameters. Generally, the TN-LCD placed between two linear polarizers (P) produces coupled intensity and phase modulation. To obtain the commonly used phase-only modulation, quarter wave plates (QWPs) are often used in front of and/or behind the LCD. Here we present a method to optimize the optical modulation properties of the TN-LCD to obtain phase-only modulation in the configuration of P-QWP-LCD-QWP-P each with proper orientation. Our method is based on the macroscopical Jones matrix descriptions for the LCD, the QWPs, and the linear polarizers. Through Jones matrix calculations, the orientations of the polarizers and QWPs can be optimized to satisfy differently desired modulation demands. In contrast to the traditional method, which requires knowledge of the LCD's internal structure parameters, our method simplified the complicated theory analysis and can work in the absence of information on the LCD's internal structure parameters, which are usually not available for the commercial products.

Accession Number: WOS:000282923300012

Author Identifiers:

ISSN: 1671-7694

Record 28 of 157

Title: Improved digital processing method used for image motion measurement based on hybrid opto-digital joint transform correlator

Author(s): Yi, HW (Yi, Hongwei); Zhao, H (Zhao, Hui); Li, YC (Li, Yingcai); Wen, DS (Wen, Desheng)

Source: CHINESE OPTICS LETTERS  Volume: 8  Issue: 10  Special Issue: SI  Pages: 989-992  DOI: 10.3788/COL20100810.0989  Published: OCT 10 2010  

Abstract: Hybrid opto-digital joint transform correlator (HODJTC) is effective for image motion measurement, but it is different from the traditional joint transform correlator because it only has one optical transform and the joint power spectrum is directly input into a digital processing unit to compute the image shift. The local cross-correlation image can be directly obtained by adopting a local Fourier transform operator. After the pixel-level location of cross-correlation peak is initially obtained, the up-sampling technique is introduced to relocate the peak in even higher accuracy. With signal-to-noise ratio >= 20 dB, up-sampling factor k >= 10 and the maximum image shift <= 60 pixels, the root-mean-square error of motion measurement accuracy can be controlled below 0.05 pixels.

Accession Number: WOS:000282923300021

ISSN: 1671-7694

Record 29 of 157

Title: The near- and mid-infrared emission properties of Tm<SUP>3+</SUP>-doped GeGaS-CsI chalcogenide glasses

Author(s): Dai, SX (Dai Shixun); Peng, B (Peng Bo); Zhang, PJ (Zhang Pengjun); Xu, TF (Xu Tiefeng); Xunsi, W (Xunsi Wang); Nie, QH (Nie Qiuhua); Zhang, XH (Zhang Xianghua)

Source: JOURNAL OF NON-CRYSTALLINE SOLIDS  Volume: 356  Issue: 44-49  Special Issue: SI  Pages: 2424-2428  DOI: 10.1016/j.jnoncrysol.2010.03.020  Published: OCT 1 2010  

Abstract: Serials of chalcogenide glasses based on composition of 72GeS(2)-18Ga(2)S(3)-10CsI (in mol%) and doped with high Tm3+ content (up to 10,000 ppm) were prepared, and their luminescence properties were investigated under excitation with 800 nm laser. The influences of doping concentration on Judd-Ofelt intensity parameter Omega(i) spontaneous transition probability A, fluorescence branching ratio beta, and radiative lifetime tau(rad) of Tm3+ in the samples were studied. Four infrared emission bands observed were centered at 1.48, 1.8, 2.3, and 3.8 mu m, corresponding to optical transitions H-3(4) -> F-3(4), F-3(4) -> H-3(6), H-3(4) -> H-3(5) and H-3(5) -> F-3(4), respectively. For 1.0 wt.% Tm3+: doped sample, no concentration quenching was observed and its emission cross-sections at 2.3 and 3.8 mu m calculated by using Fuchtbauer-Ladenburg equation were 6.85 x 10(-21) and 7.66 x 10(-21) cm(-2), respectively. (C) 2010 Elsevier B.V. All rights reserved.

Accession Number: WOS:000285282100029

Conference Title: 12th International Conference on the Physics of Non-Crystalline Solids (PNCS12)

Conference Date: SEP 06-09, 2009

Conference Location: Foz do Iguacu, BRAZIL

Author Identifiers:

ISSN: 0022-3093

eISSN: 1873-4812

Record 30 of 157

Title: Research on Spectral Classification Algorithm Based on Spatial Feature

Author(s): Gao, XH (Gao Xiao-hui); Xiangli, B (Xiangli Bin); Wei, JX (Wei Jun-xia); Wei, RY (Wei Ru-yi); Yu, T (Yu Tao)

Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 30  Issue: 10  Pages: 2772-2775  DOI: 10.3964/j.issn.1000-0593(2010)10-2772-04  Published: OCT 2010  

Abstract: With the wide use of imaging spectroscopy, applying data cubes to classification and identification of materials has been developed to be an important research content. The classification algorithms play a vital role in accuracy and precision of object identification. The most common classification algorithms mainly make use of the information gained from spectral dimension and classify the materials based on spectral match. The material reflectance spectra collected by imaging spectroscopy is determined not only by the sorts, but also by the geometry structure and roughness of material surface, and so on. Then classification and identification algorithms only using the reflection spectra have errors to some extent. This paper puts forward an algorithm based on the common classification algorithms that controls the classification process by using the spatial feature of image to promote the correctness of classification. This algorithm was applied to identify the true leaves from the fake ones. The result shows preferable spatial continuity. To a great extent, the algorithm overcomes "ma pixel" domino effect, and is proved valid.

Accession Number: WOS:000283267900040

PubMed ID: 21137418

Author Identifiers:

ISSN: 1000-0593

Record 31 of 157

Title: Long-cavity passively mode-locked fiber ring laser with high-energy rectangular-shape pulses in anomalous dispersion regime

Author(s): Li, XH (Li, Xiaohui); Liu, XM (Liu, Xueming); Hu, XH (Hu, Xiaohong); Wang, LR (Wang, Leirang); Lu, H (Lu, Hua); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei)

Source: OPTICS LETTERS  Volume: 35  Issue: 19  Pages: 3249-3251  DOI: 10.1364/OL.35.003249  Published: OCT 1 2010  

Abstract: We report on a long-cavity passively mode-locked fiber laser in the anomalous dispersion regime. The nonlinear polarization rotation technique is employed to achieve mode locking. The output pulse from the fiber laser has a rectangular shape and a corresponding Gaussian-shape spectral profile. Stable mode-locked pulses at a repetition rate of 278 kHz with single pulse energy as high as 715 nJ are obtained under equal bidirectional pumping power of 500 mW in cavity. The experimental results demonstrate that the passively mode-locked fiber laser operating in the anomalous regime can also realize a high-energy pulse, which is different from the conventional low-energy soliton pulse. (C) 2010 Optical Society of America

Accession Number: WOS:000282374800033

PubMed ID: 20890349

Author Identifiers:

ISSN: 0146-9592

eISSN: 1539-4794

Record 32 of 157

Title: Carbon dioxide gas sensor derived from a 547-hole microstructured polymer optical fiber preform

Author(s): Wang, JA (Wang, Jian); Wang, LL (Wang, Lili)

Source: OPTICS LETTERS  Volume: 35  Issue: 19  Pages: 3270-3272  DOI: 10.1364/OL.35.003270  Published: OCT 1 2010  

Abstract: In this Letter, we report a carbon dioxide gas sensor having 547 pieces of thin-film modified capillaries, which are derived from a microstructured polymer optical fiber preform. Compared with the conventional absorption-based sensor, the monolithic polymer capillary waveguide arrays have better sensitivity, because the huge sensing surfaces, composed of 547 pieces of dye-indicator-doped porous ethyl cellulose layers, interact directly with the gas molecules. As far as we know, a gas sensor based on multichannel capillary waveguide arrays has not been reported before. (C) 2010 Optical Society of America

Accession Number: WOS:000282374800040

PubMed ID: 20890356

Author Identifiers:

ISSN: 0146-9592

Record 33 of 157

Title: Linear and nonlinear optical properties of the PbSe quantum dots doped germano-silica glass optical fiber

Author(s): Watekar, PR (Watekar, Pramod R.); Ju, S (Ju, Seongmin); Lin, AX (Lin, Aoxiang); Kim, MJ (Kim, Myoung Jin); Lee, BH (Lee, Byeong Ha); Han, WT (Han, Won-Taek)

Source: JOURNAL OF NON-CRYSTALLINE SOLIDS  Volume: 356  Issue: 44-49  Special Issue: SI  Pages: 2384-2388  DOI: 10.1016/j.jnoncrysol.2010.02.012  Published: OCT 1 2010  

Abstract: We report development of a new fiber doped with PbSe quantum dots for nonlinear optical applications. PbSe quantum dots related absorption peaks were obtained at 1021, 1093 and 1351 nm. The resonant optical nonlinearity and attenuation at 1500 nm were measured to be 9.4 x 10(-16) m(2)/W and 0.01 dB/m, respectively. The emission around 1540 nm was observed upon near resonant pumping at 1064 nm. (C) 2010 Elsevier B.V. All rights reserved.

Accession Number: WOS:000285282100020

Conference Title: 12th International Conference on the Physics of Non-Crystalline Solids (PNCS12)

Conference Date: SEP 06-09, 2009

Conference Location: Foz do Iguacu, BRAZIL

Author Identifiers:

ISSN: 0022-3093

eISSN: 1873-4812

Record 34 of 157

Title: Developments and Trends of the Computed Tomography Imaging Spectrometers

Author(s): Wei, RY (Wei Ru-yi); Zhou, JS (Zhou Jin-song); Jing, JJ (Jing Juan-juan); Wang, XQ (Wang Xin-quan); Gao, XH (Gao Xiao-hui); Wang, L (Wang Le)

Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 30  Issue: 10  Pages: 2866-2873  DOI: 10.3964/j.issn.1000-0593(2010)10-2866-08  Published: OCT 2010  

Abstract: The present paper reviews the computed tomography imaging spectrometer (CTIS) measurement systems at home and abroad from the aspects of technological characterizations and research focuses. The developments of computed tomography imaging spectrometers are described, involving the adding new abilities by improving systematic structure and by incorporating other elements or systems, the study and applications of novel grating elements, detectors or apparatus, the optimizations and improvements of the system calibration methods and reconstruction algorithms. In addition, based on the classification of application scope, the extension status of probing spectral bands and application fields towards computed tomography imaging spectrometers and related systems are summarized. The principles of non-scanning computed tomography imaging spectrometer and high-throughput computed tomography imaging spectrometer are introduced. Moreover, the trends of computed tomography imaging spectrometers are discussed too.

Accession Number: WOS:000283267900062

PubMed ID: 21137440

Author Identifiers:

ISSN: 1000-0593

Record 35 of 157

Title: Optical Trapping of Double-Ring Radially Polarized Beam with Improved Axial Trapping Efficiency

Author(s): Yao, BL (Yao Bao-Li); Yan, SH (Yan Shao-Hui); Ye, T (Ye Tong); Zhao, W (Zhao Wei)

Source: CHINESE PHYSICS LETTERS  Volume: 27  Issue: 10  Article Number: 108701  DOI: 10.1088/0256-307X/27/10/108701  Published: OCT 2010  

Abstract: Radially polarized beams, focused by a high numerical aperture (NA) objective, have non-propagating fields along the propagation axis in the focal region, which leads to a higher axial trapping efficiency in comparison with linearly polarized beams. We propose a design for converting a lowest-order radially polarized beam (R-TEM01) to a double-ring radial polarization distribution (DR R-TEM01) through a specially designed polarization rotator. The phases of the two rings of this beam differ by pi. Numerical results evaluated by rigorous T-matrix method show that the DR R-TEM01 beam can improve the axial trapping efficiency compared with the R-TEM01 beam, provided that the size of trapped particles is of order of the wavelength of the beam.

Accession Number: WOS:000282870400060

Author Identifiers:

ISSN: 0256-307X

eISSN: 1741-3540

Record 36 of 157

Title: Detection efficiency for an ultraviolet photon counting imaging system based on the Ge induction readout

Author(s): Zhang, XH (Zhang, Xinghua); Zhao, BZ (Zhao, Baosheng); Liu, YA (Liu, Yong'an); Zhao, FF (Zhao, Feifei); Yan, QR (Yan, Qiurong)

Source: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT  Volume: 622  Issue: 1  Pages: 311-315  DOI: 10.1016/j.nima.2010.03.140  Published: OCT 1 2010  

Abstract: The detection efficiency, assumed proportional to the count rate, of an ultraviolet photon counting imaging system based on the Ge induction readout is studied. For the Ge induction readout, the system count rate with different Ge layer resistances, Ge layer thicknesses and ceramic thicknesses are tested under different light intensities. The test results show that the system count rate with a high resistance in the Ge layer is lower than that with a low resistance in the Ge layer; further, the imaging area decreases as the Ge layer resistance increases under high photon flux. Moreover the system count rate with a thick Ge layer is lower than that with a thin Ge layer. In addition, the system count rate with 2-mm ceramic is higher than that with 1.5- and 3-mm ceramic. The above observation should be considered when designing an ultraviolet photon counting imaging detector based on the Ge induction readout. (C) 2010 Elsevier B.V. All rights reserved.

Accession Number: WOS:000282530300045

Author Identifiers:

ISSN: 0168-9002

Record 37 of 157

Title: Properties of photon counting imaging system with Si thin films

Author(s): Zhao, FF (Zhao Fei-Fei); Liu, YA (Liu Yong-An); Hu, HJ (Hu Hui-Jun); Zhao, BS (Zhao Bao-Sheng)

Source: ACTA PHYSICA SINICA  Volume: 59  Issue: 10  Pages: 7096-7104  DOI: 10.7498/aps.59.7096  Published: OCT 2010  

Abstract: The Si thin films on ceramic substrates,which were fabricated by electron beam evaporation, were applied as charge induction layers in photon counting imaging system with induction readout. The structures and micrograph of Si thin films were studied. The X-ray diffraction (XRD) analysis and field emission scanning electron microscopy (FESEM) images indicate that the thin film has amorphous structure and is coarse due to the lattice boundary of ceramic substrate. The experimental setup was established and the detector resolution, counting rate, pulse height distribution curves etc., with different Si film thickness were compared. The results suggest that the film thickness influences on spatial resolution less than on the counting rate. Moreover, the properties of the system with Si and Ge thin films of the same resistance were compared,which shows that the properties such as distortion,counting rate and dark count rate are better with the Si films.

Accession Number: WOS:000283406400059

Author Identifiers:

ISSN: 1000-3290

Record 38 of 157

Title: Investigation of soliton pairs in an erbium-doped fiber laser with large normal dispersion

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

Source: OPTICS COMMUNICATIONS  Volume: 283  Issue: 18  Pages: 3492-3496  DOI: 10.1016/j.optcom.2010.04.107  Published: SEP 15 2010  

Abstract: We experimentally investigate the soliton pairs in a passively mode-locked erbium-doped fiber laser with large normal cavity dispersion. By adjusting the polarization state, four different kinds of soliton pairs are achieved. The pulses in soliton pairs exhibit different temporal separations, and show randomly distributed spikes on the top-flat of spectra. The pulse-pulse interactions in the soliton pairs are investigated, and it is suggested that the pulse separation, pulse duration, and their relative intensities all determine the strength of pulse interactions. (C) 2010 Elsevier B.V. All rights reserved.

Accession Number: WOS:000280051300023

Author Identifiers:

ISSN: 0030-4018

eISSN: 1873-0310

Record 39 of 157

Title: Nonlinear chirped-pulse propagation and supercontinuum generation in photonic crystal fibers

Author(s): Hu, XH (Hu, Xiaohong); Wang, YS (Wang, Yishan); Zhao, W (Zhao, Wei); Yang, Z (Yang, Zhi); Zhang, W (Zhang, Wei); Li, C (Li, Cheng); Wang, HS (Wang, Hushan)

Source: APPLIED OPTICS  Volume: 49  Issue: 26  Pages: 4984-4989  DOI: 10.1364/AO.49.004984  Published: SEP 10 2010  

Abstract: Based on the generalized nonlinear Schrodinger equation and waveguiding properties typical of the photonic crystal fiber structure, nonlinear chirped-pulse propagation and supercontinua generation in the femtosecond and picosecond regimes are investigated numerically. The simulation results indicate that an input chirp parameter mainly affects the initial stage of spectral broadening caused by the self-phase modulation (SPM) effect. In the femtosecond regime where the SPM effect plays an important role in the process of spectral broadening, an input positive chirp can enhance the supercontinuum bandwidth through a modified pulse compression phase and a decreased propagation distance required by soliton fission. In the picosecond regime, where the SPM effect contributes less to the continuum bandwidth and four-wave mixing process or modulational instability dominates the initial stage of spectral and temporal evolution, the output spectral shape and bandwidths are less sensitive to the input chirp parameters. (C) 2010 Optical Society of America

Accession Number: WOS:000281706500018

PubMed ID: 20830188

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 40 of 157

Title: Tunable and switchable multiwavelength fiber lasers with broadband range based on nonlinear polarization rotation technique

Author(s): Li, XH (Li, Xiaohui); Liu, XM (Liu, Xueming); Mao, D (Mao, Dong); Hu, XH (Hu, Xiaohong); Lu, H (Lu, Hua)

Source: OPTICAL ENGINEERING  Volume: 49  Issue: 9  Article Number: 094303  DOI: 10.1117/1.3485754  Published: SEP 2010  

Abstract: Switchable multiwavelength fiber laser outputs with a wide tuning range are experimentally observed in an ultralong cavity. Because of the long spooled single-mode fiber and filter effect of the cavity, multiwavelength lasers with the spacing of similar to 14.5 nm are obtained. The proposed fiber laser has the capacity of simultaneously emitting the three wavelengths. By means of adjusting the polarization controllers, the arbitrary single- and dual-wavelength operations are achieved in our laser. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3485754]

Accession Number: WOS:000282370400021

Author Identifiers:

ISSN: 0091-3286

Record 41 of 157

Title: Wavelength dependence four-wave mixing spectroscopy in a micrometric atomic vapour

Author(s): Li, YY (Li Yuan-Yuan); Li, L (Li Li); Zhang, YP (Zhang Yan-Peng); Bi, SW (Bi Si-Wen)

Source: CHINESE PHYSICS B  Volume: 19  Issue: 9  Article Number: 090702  Published: SEP 2010  

Abstract: This paper presents a theoretical study of wavelength dependence four-wave-mixing (FWM) spectroscopy in a micrometric thin atomic vapour. It compares three cases termed as mismatched case I, matched case and mismatched case II for the probe wavelength less, equal and greater than the pump wavelength respectively. It finds that Dicke-narrowing can overcome width broadening induced by Doppler effects and polarisation interference of thermal atoms, and high resolution FWM spectra can be achieved both in matched and mismatched wavelength for many cases. It also finds that the magnitude of the FWM signal can be dramatically modified to be suppressed or to be enhanced in comparison with that of matched wavelength in mismatched case I or II. The width narrowing and the magnitude suppression or enhancement can be demonstrated by considering enhanced contribution of slow atoms induced by atom-wall collision and transient effect of atom-light interaction in a micrometric thin vapour.

Accession Number: WOS:000282186400048

Author Identifiers:

ISSN: 1674-1056

Record 42 of 157

Title: Low-timing-jitter, stretched-pulse passively mode-locked fiber laser with tunable repetition rate and high operation stability

Author(s): Liu, YS (Liu, Yuanshan); Zhang, JG (Zhang, Jian-Guo); Chen, GF (Chen, Guofu); Zhao, W (Zhao, Wei); Bai, J (Bai, Jing)

Source: JOURNAL OF OPTICS  Volume: 12  Issue: 9  Article Number: 095204  DOI: 10.1088/2040-8978/12/9/095204  Published: SEP 2010  

Abstract: We design a low-timing-jitter, repetition-rate-tunable, stretched-pulse passively mode-locked fiber laser by using a nonlinear amplifying loop mirror (NALM), a semiconductor saturable absorber mirror (SESAM), and a tunable optical delay line in the laser configuration. Low-timing-jitter optical pulses are stably produced when a SESAM and a 0.16 m dispersion compensation fiber are employed in the laser cavity. By inserting a tunable optical delay line between NALM and SESAM, the variable repetition-rate operation of a self-starting, passively mode-locked fiber laser is successfully demonstrated over a range from 49.65 to 50.47 MHz. The experimental results show that the newly designed fiber laser can maintain the mode locking at the pumping power of 160 mW to stably generate periodic optical pulses with width less than 170 fs and timing jitter lower than 75 fs in the 1.55 mu m wavelength region, when the fundamental repetition rate of the laser is continuously tuned between 49.65 and 50.47 MHz. Moreover, this fiber laser has a feature of turn-key operation with high repeatability of its fundamental repetition rate in practice.

Accession Number: WOS:000282132900008

ISSN: 2040-8978

Record 43 of 157

Title: Experimental investigation of square dissipative soliton generation and propagation

Author(s): Mao, D (Mao, Dong); Liu, XM (Liu, Xueming); Wang, LR (Wang, Leiran); Lu, H (Lu, Hua)

Source: APPLIED OPTICS  Volume: 49  Issue: 25  Pages: 4751-4755  DOI: 10.1364/AO.49.004751  Published: SEP 1 2010  

Abstract: We have experimentally investigated the generation and propagation of square dissipative solitons emitted from an erbium-doped fiber laser with large normal cavity dispersion. The square pulse exhibits an approximately Gaussian spectral profile and large frequency chirp on its edges. When the square pulse propagates through a segment of single-mode fiber (SMF), it can be shaped to a Gaussian pulse and the corresponding spectrum will have a redshift with a prolonged wing on the longer wavelength. Our experiments show that the pulse evolution in the SMF is determined by the combined effects of the fiber dispersion, intrapulse Raman scattering, and the pulse initial chirps. (c) 2010 Optical Society of America

Accession Number: WOS:000281748100010

PubMed ID: 20820217

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 44 of 157

Title: Color to Gray: Visual Cue Preservation

Author(s): Song, ML (Song, Mingli); Tao, DC (Tao, Dacheng); Chen, C (Chen, Chun); Li, XL (Li, Xuelong); Chen, CW (Chen, Chang Wen)

Source: IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE  Volume: 32  Issue: 9  Pages: 1537-1552  DOI: 10.1109/TPAMI.2009.74  Published: SEP 2010  

Abstract: Both commercial and scientific applications often need to transform color images into gray-scale images, e. g., to reduce the publication cost in printing color images or to help color blind people see visual cues of color images. However, conventional color to gray algorithms are not ready for practical applications because they encounter the following problems: 1) Visual cues are not well defined so it is unclear how to preserve important cues in the transformed gray-scale images; 2) some algorithms have extremely high time cost for computation; and 3) some require human-computer interactions to have a reasonable transformation. To solve or at least reduce these problems, we propose a new algorithm based on a probabilistic graphical model with the assumption that the image is defined over a Markov random field. Thus, color to gray procedure can be regarded as a labeling process to preserve the newly well-defined visual cues of a color image in the transformed gray-scale image. Visual cues are measurements that can be extracted from a color image by a perceiver. They indicate the state of some properties of the image that the perceiver is interested in perceiving. Different people may perceive different cues from the same color image and three cues are defined in this paper, namely, color spatial consistency, image structure information, and color channel perception priority. We cast color to gray as a visual cue preservation procedure based on a probabilistic graphical model and optimize the model based on an integral minimization problem. We apply the new algorithm to both natural color images and artificial pictures, and demonstrate that the proposed approach outperforms representative conventional algorithms in terms of effectiveness and efficiency. In addition, it requires no human-computer interactions.

Accession Number: WOS:000279969000001

PubMed ID: 20634551

Author Identifiers:

ISSN: 0162-8828

eISSN: 1939-3539

Record 45 of 157

Title: Design of Topas photonic bandgap fiber with high birefringence and low confinement loss

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

Source: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT  Volume: 621  Issue: 1-3  Pages: 548-551  DOI: 10.1016/j.nima.2010.05.045  Published: SEP 2010  

Abstract: A highly birefringent hollow-core photonic bandgap fiber based on Topas cyclic olefin copolymer is designed. The rhombic hollow-core with rounded corners is formed by omitting four central air holes of the cladding structure. The guided modes, birefringence and confinement loss of the fiber are investigated by using the full-vector finite element method. A high phase birefringence of the order of 10(-3), a group birefringence of the order of 10(-2) and confinement loss less than 0.1 dB/km are obtained at the central wavelength (1.55 mu m) range of the bandgap for fiber with seven rings of air holes in the cladding region. (C) 2010 Elsevier B.V. All rights reserved.

Accession Number: WOS:000281109100080

ISSN: 0168-9002

eISSN: 1872-9576

Record 46 of 157

Title: Experimental research on high-energy dissipative solitons in an erbium-doped fiber laser

Author(s): Wang, LR (Wang Lei-Ran); Liu, XM (Liu Xue-Ming); Gong, YK (Gong Yong-Kang)

Source: ACTA PHYSICA SINICA  Volume: 59  Issue: 9  Pages: 6200-6204  DOI: 10.7498/aps.59.6200  Published: SEP 2010  

Abstract: We have employed a nonlinear polarization rotation technique to realize the self-starting passive mode-locking in an erbium-doped fiber laser with positive dispersion. The laser can emit high-energy dissipative solitons without wave-breaking. The pulse-shaping mechanism, which is qualitatively distinct from the conservative solitons in negative dispersion cavity, may originate from the laser gain, loss, NPR, cavity dispersion, or other fiber nonlinearity effects. To our best knowledge, it is the first report on the experimental observations for high-energy wave-breaking-free dissipative solitons forming in a fiber laser with ultra-large net-normal cavity dispersion. The spectrum of these strongly chirped pulses covers the wavelength range from 1530 to 1660 nm. The FWHM width of the spectrum can be as large as 42 nm, and the maximal total energy of a single-pulse is estimated to be similar to 34.4 nJ.

Accession Number: WOS:000281449800044

Author Identifiers:

ISSN: 1000-3290

Record 47 of 157

Title: One-dimensional photon counting detector with vernier position sensitive anode

Author(s): Yan, QR (Yan Qiu-Rong); Zhao, BS (Zhao Bao-Sheng); Yang, H (Yang Hao); Liu, YA (Liu Yong-An); Zhu, XP (Zhu Xiang-Ping); Li, M (Li Mei)

Source: ACTA PHYSICA SINICA  Volume: 59  Issue: 9  Pages: 6164-6171  DOI: 10.7498/aps.59.6164  Published: SEP 2010  

Abstract: One-dimensional photon counting detector with vernier position sensitive anode is reported. The decode principle and design of vernier position sensitive anode are described in detail. An ultraviolet photon counting system was built based on one-dimensional photon counting detector with vernier position sensitive anode. One-dimensional coordinates of single-photon events can be simultaneously measured when the detection system works in photon counting mode. The spatial distribution of pulse counts, which corresponds to one-dimensional spatial distribution of incident light intensity, was obtained. The resolution of this system is better than 100 m mu according to the resolution test. The detector can detect one-dimensional spatial distribution of the intensity of very weak particle flow such as high-energy photons, electrons and ions flow, so it can be used for deep space exploration, spectral measurement, high-energy physics and bio-luminescence detection.

Accession Number: WOS:000281449800039

Author Identifiers:

ISSN: 1000-3290

Record 48 of 157

Title: Generation of multiple spherical spots with a radially polarized beam in a 4π focusing system

Author(s): Yan, SH (Yan, Shaohui); Yao, BL (Yao, Baoli); Zhao, W (Zhao, Wei); Lei, M (Lei, Ming)

Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION  Volume: 27  Issue: 9  Pages: 2033-2037  DOI: 10.1364/JOSAA.27.002033  Published: SEP 2010  

Abstract: We demonstrate the possibility of creating multiple spherical spots in a 4 pi focusing system with a radially polarized beam. Using spherical waves to expand the plane wave factor in the Richards-Wolf integral, it is found that a proper spatial modulation in the amplitude of the input field with radial polarization can form multiple spherical spots with a focusing system satisfying the Herschel condition. These spots are distributed symmetrically about the focus on the optical axis with variable positions and intensities. Although we consider only the case of three spherical spots in this paper, generalization to the multiple-spots case will present no difficulty. (C) 2010 Optical Society of America

Accession Number: WOS:000281671900018

PubMed ID: 20808413

Author Identifiers:

ISSN: 1084-7529

Record 49 of 157

Title: Energy Transfer and Mid-Infrared Luminescence Properties of Tm<SUP>3+</SUP>/Dy<SUP>3+</SUP> Codoped Chalcohalide Glasses

Author(s): Zhang, PJ (Zhang Peng-jun); Dai, SX (Dai Shi-xun); Cao, Y (Cao Ying); Peng, B (Peng Bo); Xu, TF (Xu Tie-feng); Nie, QH (Nie Qiu-hua); Zhang, XH (Zhang Xiang-hua)

Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 30  Issue: 9  Pages: 2321-2325  DOI: 10.3964/j.issn.1000-0593(2010)09-2321-05  Published: SEP 2010  

Abstract: series of chalcohalide glasses based on the composition 0. 9 (Ge-25 Ga-5 S-70)-0. 1CsI doped with the different Tm3+/Dy3+ ions ratio were synthesized by melt-quenching technique. The absorption spectra, and mid-infrared fluorescence of different glass samples under 800 nm laser excitation were measured. The results prove that, Tm3+ is an efficient sensitizer, which can enhance the Dy3+ : 2.9 mu m fluorescence intensity significantly. A decrease in the intensity of 1. 8 mu m fluorescence and lifetimes of the Tm3+ : F-3(4) level occurred with increasihg the concentration of Dy3+ ions from 0 to 1 Wt% where Tm3+ concentration was fixed to 0. 5 Wt%. Also a wide spectral oveflap between Tm3+ : 1. 8 mu m emission and the absorption of Dy3+ : H-6(15/2)-> H-6(11/2) level.

Accession Number: WOS:000281661000005

PubMed ID: 21105387

Author Identifiers: