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Femtosecond Studies on Third-Order Optical Nonlinearities of Polyanilines

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Chinese Physics Letters 1994年第8期11卷 491-493页

作者： WANG Hui LAI Tianshu lin weizhu MO Dang OUYANG Meng GONG Kecheng Department of Physics Zhongshan UniversityGuangzhou 510275 Department of Polymer South China University of TechnologyGuangzhou 510641

The ultrafast dynamics of third order nonlinearities of polyaniline(PAn)and polyaniline doped in polymethyl mathacrylate(PAn-PMMA)films are investigated using femtosecond absorption *** ultrafast initial exciton deformation time of about 100fs is observed in PAn *** PAn-PMMA film,the third-order nonlinearity results in an efficient two-photon absorption at about 2eV.

关键词： spectroscopy film absorption

Effects of cavity-dispersion noncoaxiality on the generation of ultrabroadband femtosecond pulses

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Chinese Science Bulletin 2008年第5期53卷 659-663页

作者： JIAO ZhongXing LEI Liang HUANG Zhiling WEN dinHui LAI Tianshu lin weizhu State Key Laboratory of Optoelectronic Materials and Technologies Department of Physics Sun Yat-sen University Guangzhou 510275 China

The effects of cavity-dispersion noncoaxiality (CDN) on the generation of ultrabroadband femtosecond pulses in KLM Ti:sapphire laser were investigated theoretically and experimentally. It was predicted that when the laser sub-cavity works near the coaxial operation point, the limitation of CDN on the bandwidth broadening is minimum, which is favorable for ultrabroadband pulse generation. On the basis of this prediction, femtosecond pulses with bandwidth of 650 to 1000 nm were directly generated from a home built KLM Ti:sapphire laser. To our knowledge, they are the broadest bandwidth pulses produced from KLM Ti:sapphire laser with similar oscillator configuration and gain crystal length of 3 mm.

关键词：兰宝石激光器空腔散射非同轴性超宽毫微秒脉冲激光技术

Sub-10-fs pulse generation directly from a KLM Ti: sapphire laser

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Chinese Science Bulletin 2002年第12期47卷 1050-1052页

作者： weizhu lin Rui Liao Jinhui Wen Zhigang Liu Li Deng Haichao Zhang Tianshu Lai Zhongshan Univ Dept Phys State Key Lab Ultrafast Laser Spect Guangzhou 510275 Peoples R China

By reducing the effects of frequency dependent mode size and intracavity gain saturation of a KLM Ti: sapphire laser, the pulse bandwidth broadening is enhanced significantly. 8.5 fs pulses with the bandwidth of 92 nm at wavelength of 710 nm have been generated directly from this laser and measured with an extracavity group velocity dispersion compensation system.

关键词： femtosecond pulses Kerr-lens mode-locking self phase modulation.

TRANSIENT PHOTOLUMINESCENCE SPECTRA OF GaAs/AlGaAs QUANTUM WELLS, QUANTUM WELL WIRES, AND QUANTUM WELL BOXES

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Chinese Physics Letters 1990年第6期7卷 284-287页

作者： CHENG Wenqin HUANG Yi ZHOU Junming FENG Wei WANG Hezhou SHE Weilong HUANG Xuguang lin weizhu YU Zhenxin XU Geng Institute of Physics Chinese Academy of SciencesBeijing 100080 Laboratory of Ultrafast Laser Spectrascopy Zhongshan UniversityGuangzhou 510275 Department of Physics Zhongshan UniversityGuangzhou 510275

The interaction of the electrons with the phonons in GaAs/AlGaAs quantum wells,quantum well wires,and quantum well boxes has been studied by meansuring their time resolved photoluminescence(PL)*** the quantum well(Q W)system,relaxation time of the electron energy of the narrower well is shorter than that of the wider *** is attributed to the stronger interaction of the electrons with the interface mode *** the Q W wires and Q W boxes,the shortening of the relaxation time is *** is due to the stronger electron-phonon interaction caused by the reduction of screening *** experiments also demonstrated the incident laser intensity dependence of the relaxation time.

关键词： spectra effect relaxation

Large Stable Photoinduced Anisotropy and Optical Information Storage in Poly [4-bis (N, N-oxyethylene) imino-4- nitroasobenzene Succinyl] Film by Two-Wave Mixing

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Chinese Physics Letters 1995年第12期12卷 735-738页

作者： WEI Xiong YAN Xingzhong lin weizhu MO Dang LIANG Zhaoxi Department of Physics ZhongShan universityGuangzhou 510275 State Key Laboratory of Ultrafast Laser Spectroscopy ZhongShan UniversityGuangzhou 510275 Institute of Polymer Science ZhongShan UniversityGuangzhou 510275

Optical information storage caused by photoinduced anisotropy in poly[4'-bis(N,N-oxyethylene)imino-4-nitroazobenzene succinyl]film is studied by two-wave *** Nd:YAG second-harmonic pulses(100ps),grating of orientation of azobenzene molecules is formed in the film by photoinduced *** to third-order diffraction was *** turning off one of the two pump lights,the signals *** the weaker one of two pump lights was turned off,the intensities of diffraction beams of another pump light almost did not *** information recorded in the film can be 100%maintained for a long time(monitored over 100 days without obvious decrease).

关键词： Nd:YAG pump film

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光学相干控制中脉冲光束等相面的实时测控

光子学报 2006年第3期35卷 338-341页

作者：雷亮林春梅刘鲁宁林位株中山大学光电材料与技术国家重点实验室广州510275

描述了飞秒脉冲基频光、倍频光光束位相差对相干控制光电流注入的控制作用,提出一种控制基频光、倍频光在全光孔径干涉光场内的等相面保持一致的实验方案,制作了一套相位差稳定自动控制系统,并应用于光学相干控制光电流实验中,获得较好... 详细信息

描述了飞秒脉冲基频光、倍频光光束位相差对相干控制光电流注入的控制作用,提出一种控制基频光、倍频光在全光孔径干涉光场内的等相面保持一致的实验方案,制作了一套相位差稳定自动控制系统,并应用于光学相干控制光电流实验中,获得较好的实时控制结果·

关键词：相干控制光电流位相畸变二次倍频飞秒脉冲

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一种新型卟啉侧链聚合物的飞秒荧光动力学

光学学报 2006年第6期26卷 865-868页

作者：王惠张伟余汉城黄锦汪林位株计亮年中山大学光电材料与技术国家重点实验室广州510275 中山大学化学与化学工程学院广州510275

研究了一种新型的卟啉侧链聚合物丙烯腈-丙烯酸卟啉酯共聚物{poly[porphyrin acrylate-acrylonitrile]（P[（por）A-AN]）的链间和链内的卟啉分子的相互作用对聚合物薄膜发光性质的影响。通过采用飞秒荧光光谱技术测量了pE（por）A-AN]... 详细信息

研究了一种新型的卟啉侧链聚合物丙烯腈-丙烯酸卟啉酯共聚物{poly[porphyrin acrylate-acrylonitrile]（P[（por）A-AN]）的链间和链内的卟啉分子的相互作用对聚合物薄膜发光性质的影响。通过采用飞秒荧光光谱技术测量了pE（por）A-AN]薄膜的荧光动力学过程。测量结果表明：纯p[（por）A-AN]薄膜（～450ps）显示出了比混合物薄膜p[（por）A-AN]／polystyrene（PSE）（～1．3ns）快得多的荧光弛豫过程。而p[（por）A-AN]／PSE混合物薄膜显示出较纯p[（por）A-AN]薄膜增强的荧光效率。增加p[（por）A-AN]分子内卟啉侧链基团的浓度导致纯p[（por）A-AN]薄膜和p[（por）A-AN]／PSE混合物薄膜的荧光效率的增强和寿命（由近26～36ps）的增加。分子间和分子内卟啉侧链基团之间的无辐射能量转移和分子内卟啉侧链基团的旋转运动在p[（por）A-AN]的荧光动力学过程中起着重要的作用。

关键词：发光学荧光动力学过程飞秒技术卟啉侧链聚合物

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接入网技术及佛山接入网规划建设

电信科学 1998年第12期14卷 32-34页

作者：李文权赵奇禄林位株佛山市邮电局中山大学

本文简要地介绍了有关的接入网技术和接入网在通信网中的重要意义，指出了Ｖ５接口的特点，并对光环路、远端模块和接入网（Ｖ５接口）进行了比较。同时根据佛山市信息网络的实际需要，从接入网总体目标、接入网规划建设原则和Ｖ５接口... 详细信息

本文简要地介绍了有关的接入网技术和接入网在通信网中的重要意义，指出了Ｖ５接口的特点，并对光环路、远端模块和接入网（Ｖ５接口）进行了比较。同时根据佛山市信息网络的实际需要，从接入网总体目标、接入网规划建设原则和Ｖ５接口使用等方面，提出了佛山市接入网建设的总体考虑。

关键词：接入网 V5接口通信网

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行波电吸收调制器中脊宽对频带宽度的影响

光子学报 2005年第12期34卷 1795-1798页

作者：邢晓波刘叶新陈晓文傅思镜林位株中山大学光电材料与技术国家重点实验室广州510275

根据行波电吸收调制器(TWEAM)的微波传输特性,提出了等效电路模型.制作了工作波长为850nm的GaAs/GaAlAs材料的TWEAM,并通过等效电路模型分析了特性阻抗Z0、微波传输常数γ和S21,得出脊宽对器件微波特性的影响.从理论上验证了较小脊宽可... 详细信息

根据行波电吸收调制器(TWEAM)的微波传输特性,提出了等效电路模型.制作了工作波长为850nm的GaAs/GaAlAs材料的TWEAM,并通过等效电路模型分析了特性阻抗Z0、微波传输常数γ和S21,得出脊宽对器件微波特性的影响.从理论上验证了较小脊宽可以降低微波和光波之间的速度失配、波导的传输损耗及传输线和终端及源端之间的阻抗失配.理论模拟得出:脊宽为2μm时,器件提供的带宽为23.9GHz.

关键词：行波电吸收调制器(TW—EAM) 特性阻抗传输常数调制带宽