2011
2011
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Record 301 of
Title:Ultrafast all-optical switching in nanoplasmonic waveguide with Kerr nonlinear resonator
Author(s):Lu, Hua(1); Liu, Xueming(1); Wang, Leiran(1); Gong, Yongkang(1); Mao, Dong(1)Source: Optics Express Volume: 19 Issue: 4 DOI: 10.1364/OE.19.002910 Published: February 14, 2011Abstract:A novel ultrafast all-optical switching based on metal-insulatormetal nanoplasmonic waveguide with a Kerr nonlinear resonator is proposed and investigated numerically. With the finite-difference timedomain simulations, it is demonstrated that an obvious optical bistability of the signal light appears by varying the control-light intensity, and an excellent switching effect is achieved. This bistability originates from the intensity-dependent change induced in the dielectric constant of Kerr nonlinear material filled in the nanodisk resonator. It is found that the proposed all-optical switching exhibits femtosecond-scale feedback time. ? 2011 Optical Society of America.Accession Number: 20110813682553 -
Record 302 of
Title:Generation of high-power tunable picosecond fiber laser
Author(s):Liu, Hongjun(1); Gao, Cunxiao(1); Huang, Nan(1); Sun, Qibing(1); Long, Hanbo(1); Wen, Jin(1); Wang, Yishan(1); Zhao, Wei(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 40 Issue: 8 DOI: Published: August 2011Abstract:Generation technology of high-power tunable picosecond fiber laser based on the gain switch laser diode and Yb-doped fiber amplifier was experimentally studied. A gain switch laser diode was adopted as the seed source, and a multi-stage single mode Yb-doped fiber preamplifier was combined with two large mode area double-clad Yb-doped fiber main amplifiers to construct the amplification system. The gain compensation technology, tunable filter technology, Sagnac loop technology and cladding pump technology were also used in the high-power tunable fiber picosecond laser system. High stability and excellent beam quality (M2Accession Number: 20114214432387 -
Record 303 of
Title:Evolution of dissipative-soliton laser from molecule to multipulse
Author(s):Liu, X.M.(1); Duan, L.N.(1); Mao, D.(1); Wang, L.R.(1)Source: Laser Physics Volume: 21 Issue: 6 DOI: 10.1134/S1054660X1111020X Published: June 2011Abstract:We report on the evolution of dissipative-soliton laser from single pulse to soliton molecule, lastly to multiple pulses. The experimental observations show that the pulse separation of soliton molecules is oscillating stochastically. It is found that the proposed fiber laser delivers pulses from a soliton to a soliton molecule, two solitons, a soliton molecule together with a soliton, and three solitons, respectively, when, the pump strength is enhanced gradually. ? Pleiades Publishing, Ltd. 2011.Accession Number: 20113314243886 -
Record 304 of
Title:Error-free OTDM demultiplexer using the supercontinuum spectrum-slicing induced clock signal
Author(s):Feng, Huan(1); Zhao, Wei(1); Yan, Shuangyi(1); Xie, Xiaoping(1)Source: Optics Communications Volume: 284 Issue: 19 DOI: 10.1016/j.optcom.2011.05.027 Published: September 1, 2011Abstract:We experimentally demonstrate an 80-Gb/s optical time-division multiplexing (OTDM) demultiplexing system based on the cross-phase modulation (XPM) effect in high-nonlinearity fibers. The message carried by OTDM signal is loaded onto the probe signal by sampling the OTDM packet with a 10-GHz stable and controllable clock pulse train. The clock signal with ~ 11 ps pulse width is achieved by employing supercontinuum spectrum-slicing technique, which is distinct from that based on mode-locked lasers. The demultiplexed signal is obtained by filtering out the XPM-induced spectral sidebands of the probe signal. The OTDM demultiplexer based on this novel technique shows excellent performances and contributes to a bit error rate of as low as 10-9. ? 2011 Elsevier B.V.Accession Number: 20113314229596 -
Record 305 of
Title:Mathematical representation and experimental generation of cylindrical vector beams
Author(s):Duan, Tao(1); Jin, Pengcheng(1); Li, Chunfang(1)Source: Chinese Optics Letters Volume: 9 Issue: SUPPL. 1 DOI: 10.3788/COL201109.S10602 Published: June 2011Abstract:Cylindrical vector beams are described by the representation formalism of finite electromagnetic beams in free space. This is achieved by factorizing the field vector into a mapping matrix and a Jones-like vector. The vectorial property of a finite beam can be described by a degree of freedom of the mapping matrix that can be determined by the azimuthal angle of a fixed unit vector with respect to the wave vector. In addition, it is a simple and flexible experimental device for converting linearly polarized light beams into cylindrical vector beams. The radially or azimuthally polarized beam is easily converted into either one of these by varying the applied voltage. ? 2011 Chinese Optics Letters.Accession Number: 20113214224391 -
Record 306 of
Title:Tunable multi-channel wavelength demultiplexer based on MIM plasmonic nanodisk resonators at telecommunication regime
Author(s):Wang, Guoxi(1); Lu, Hua(1); Liu, Xueming(1); Mao, Dong(1); Duan, Lina(1)Source: Optics Express Volume: 19 Issue: 4 DOI: 10.1364/OE.19.003513 Published: February 14, 2011Abstract:The tunable multi-channel wavelength demultiplexer (WDM) based on metal-insulator-metal plasmonic nanodisk resonators is designed and numerically investigated by utilizing Finite-Difference Time-Domain (FDTD) simulations. It is found that the channel wavelength of WDM is easily tuned by changing the geometrical parameters of the structure and the material filled in the nanodisk resonator. The multi-channel WDM structure consisting of a plasmonic waveguide and several nanodisk resonators increases the transmission up to 70% at telecommunication regime, which is two times higher than the results reported in a recent literature [Opt. Express 18, 11111(2010)]. Our WDM can find important potential applications in highly integrated optical circuits. ? 2011 Optical Society of America.Accession Number: 20110813682542 -
Record 307 of
Title:Design and experiment of a novel high-power optical fiber isolator
Author(s):Chen, Xing(1); Zhang, Wen-Song(2); Hu, Man-Li(1); Liu, Lan-Shu(2); Wang, Jian(1); Wang, Shan-Li(1)Source: Guangdianzi Jiguang/Journal of Optoelectronics Laser Volume: 22 Issue: 3 DOI: Published: March 2011Abstract:Based on the spherical lens and terbium gallium garnet(TGG), a novel optical fiber isolator with high-power is designed, which can fully meet the requirements of the high-power fiber laser. Within the wavelength range of 1064±15 nm, the measured results show that the insertion loss is below 0.61 dB, the isolation is larger than 24.5 dB and the laser can work stably when the input power is 45 W.Accession Number: 20111613922672 -
Record 308 of
Title:Influence of the initial chirp on the supercontinuum generation in silicon-on-insulator waveguide
Author(s):Wen, J.(1); Liu, H.(1); Huang, N.(1); Sun, Q.(1); Zhao, W.(1)Source: Applied Physics B: Lasers and Optics Volume: 104 Issue: 4 DOI: 10.1007/s00340-011-4496-1 Published: September 2011Abstract:We propose a practical method to broaden the bandwidth of supercontinuum generated in silicon-on-insulator (SOI) waveguide by controlling the initial chirp of inputting femtosecond pulses, which has the main impact on the initial stage of the spectral broadening caused by the self-phase modulation (SPM) effect. The numerical results show that the bandwidth and flatness of the supercontinuum generated in SOI waveguide are sensitive to the initial chirp of inputting femtosecond pulses, the supercontinuum bandwidth can be remarkably enhanced by inputting positive chirp femtosecond pulses with a decreased propagation distance required by soliton fission, and the maximum bandwidth of supercontinuum can be increased to 1500 nm. ? 2011 Springer-Verlag.Accession Number: 20114114413433 -
Record 309 of
Title:Robust color correction in stereo vision
Author(s):Wang, Qi(1); Yan, Pingkun(1); Yuan, Yuan(1); Li, Xuelong(1)Source: Proceedings - International Conference on Image Processing, ICIP Volume: Issue: DOI: 10.1109/ICIP.2011.6116722 Published: 2011Abstract:The phenomenon of color discrepancy between image pairs happens frequently in stereo vision systems. This inconsistence in color domain may cause difficulties when identifying point correspondence to reconstruct the scene depth. In this paper, we propose a robust algorithm to correct the color discrepancy between images. The proposed algorithm neither requires a color calibration chart/object which is a tedious procedure, nor explicitly compensates for the image as a whole, which possibly give bad correction results in local areas of an image. Instead, we correct the image region by region. Experiments show that the presented color correction algorithm is effective and efficient. ? 2011 IEEE.Accession Number: 20120514730706 -
Record 310 of
Title:Communication capacity of a free space laser communication system in atmospheric turbulent and disperse channels
Author(s):Lu, Hongqiang(1,2); Zhao, Wei(1); Xie, Xiaoping(1,3)Source: Chinese Optics Letters Volume: 9 Issue: SUPPL. 1 DOI: 10.3788/COL201109.S10603 Published: June 2011Abstract:The pulse broadening and communication capacity in atmospheric turbulent and disperse channels are investigated. Models on pulse broadening are proposed, and the simulated results for a typical atmospheric condition and configuration are provided. The results show that the capacity of the system is affected mainly by atmospheric dispersion rather than atmospheric turbulence. The received pulse width can be minimized, and the system-achievable capacity can be maximized by selecting the optimum input pulse width. The proposed method can be used to predict the achievable capacity of a free space laser communication system in turbulent and disperse channels. ? 2011 Chinese Optics Letters.Accession Number: 20113214224392 -
Record 311 of
Title:The research of the high precision universal stable reconnaissance platform in near space
Author(s):Yang, Hong-Tao(1,2); Cao, Jian-Zhong(1); Fan, Zhe-Yuan(1,2); Chen, Wei-Ning(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 8196 Issue: DOI: 10.1117/12.900298 Published: 2011Abstract:The appliance of military was recognized more and more ,It is important that pod can bear the weight of the availability payload achieve the observation to the earth in 20km-100km area and work in the all-weather. The stable platform can load high imaging spectrometer, the thermal infrared imager, the infrared radiometer, the millimeter waves radar, the laser weapon and so on, in order to realize reconnaissance and attacking integrative and warning the long-distant missile. The stabilization accuracy of platform is prior to 20μrad and burden heavy load to the best of one's abilities. It used high precision velocity and acceleration gyroscope to fulfill the stabilization of the platform. Light-weight design by using new composite material and optimizing design. It was adapt to the near space environment better by structure design and simulation analysis. Enhance its basic frequency and sure the rigid of the frame platform .In addition, the structure of platform apply the two-axis and four-frame and use the method of FEA to fulfill the optimum design in order to attain the object of light-weight. In consider to the precision of the platform I establish the math model and make use of the monte carlo method to appraise and analysis the error that affect the precision of the platform. After emulating by the software of the Matlab to verify the results. It is apply the method that link the platform and aerocraft by mounting the no angular displacement shock absorbers on the elevator mechanism. This kind of design insulate the angular vibration and minish the linear vibration to ensure the image quality. ? 2011 SPIE.Accession Number: 20113614296310 -
Record 312 of
Title:High energy dual-wavelength mid-infrared extracavity KTA optical parametric oscillator
Author(s):Liu, Hongjun(1); Sun, Qibing(1); Huang, Nan(1); Zhu, Shaolan(1); Zhao, Wei(1)Source: World Academy of Science, Engineering and Technology Volume: 53 Issue: DOI: Published: May 2011Abstract:A high energy dual-wavelength extracavity KTA optical parametric oscillator (OPO) with excellent stability and beam quality, which is pumped by a Q-switched single-longitudinal-mode Nd:YAG laser, has been demonstrated based on a type II noncritical phase matching (NCPM) KTA crystal. The maximum pulse energy of 10.2 mJ with the output stability of better than 4.1% rms at 3.467 μm is obtained at the repetition rate of 10 Hz and pulse width of 2 ns, and the 11.9 mJ of 1.535 μm radiation is obtained simultaneously. This extracavity NCPM KTA OPO is very useful when high energy, high beam quality and smooth time domain are needed.Accession Number: 20125215834076