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EXCITED STATE STIMULATED RAMAN SCATTERING FROM SODIUM VAPOR

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Chinese Physics Letters 1989年第1期6卷 12-15页

作者： WANG Shumin qian shixiong LI Yufen Physics Department Fudan UniversityShanghai

Under the Na vapor,states was near resonant radiation field-atom interaction in large population difference between 3^(2)P_(1/2)and 3^(2)P_(3/2)generated,then occurred the excited state stimulated Raman Scattering(ESSRS).By the sequential four-wave mixing(FWM)process,multi-line ESSRS and the buffer gas effeet have been observed.A theory has been developed to explain the experimental results.

关键词： resonant excited mixing

Photoluminescence Study of C_(70) Film Manufactured by Physical Jet Deposition

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Chinese Physics Letters 1995年第12期12卷 717-719页

作者： WANG Derong KE Guoqing qian shixiong PENG Wenji YU Zhenxin Department of Physics Fudan UniversityShanghai 200433 Ultrafast Laser Spectroscopy Laboratory Zhongshan UniversityGuangzhou 510275

We have fabricated C_(70) film by physical jet deposition(PJD)technique and measured the absorption and photoluminescence(PL)spectra of this End C_(70) *** comparison with the deposited C_(70) film in high vacuum,the absorption and integrated PL spectra are similar,but there is a big difference in the time-resolved *** C_(70) film made by PJD shows a very fast PL decay of less than 20ps which should result from the fast relaxation process of C_(70) molecule in the excited state S_(1) of this new kind film.

关键词： film film relaxation

Optical nonlinearity and ultrafast dynamics of ion exchanged silver nanoparticles embedded in soda-lime silicate glass

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Chinese Science Bulletin 2008年第5期53卷 695-699页

作者： YANG XiuChun LI ZhiHui LlWeiJie XU JingXian DONG ZhiWei qian shixiong School of Materials Science and Engineering Tongji University Shanghai 200092 China National Key Surface Physics Laboratory Department of Physics Fudan University Shanghai 200433 China

Ag nanoparticles embedded in soda-lime silicate glass were fabricated by ion-exchange and subse-quently annealing method. Z-scan technique, femtosecond time-resolved optical Kerr effect (OKE) technique and femtosecond pump-probe experiment were used to investigate the effects of laser wavelength and laser pulse duration as well as annealing temperature on the third-order optical nonlinearity and ultrafast dynamics of the composites. It was found that the third-order susceptibility of Ag nanoparticles composite glass measured by 400 nm pulse source is larger than that measured by 800 nm pulse source due to an enhancement effect of local field near surface plasmon resonance of Ag nanoparticles in silicate glass. The third-order optical nonlinearity measured by ns laser source is about two orders of magnitude larger than that measured from fs pulse. The annealing temperature has an important effect on the third-order optical nonlinearity and ultrafast dynamics of the composites. Third-order nonlinear susceptibility up to 10?10 esu and fast relaxation process up to 0.2 ps have been obtained in Ag nanoparticles doped glass.

关键词：碱石灰硅酸盐玻璃银纳米粒子光学非线性超速动力学

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Excited-state dynamics in light-harvesting complex of Rhodobacter sphaeroides

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Chinese Science Bulletin 2008年第13期53卷 1955-1962页

作者： LIU KangJun LIU WeiMin YAN YongLi DONG ZhiWei XU ChunHe qian shixiong Physics Department Fudan University Shanghai 200433 China National Key Surface Physics Laboratory Fudan University Shanghai 200433 China Shanghai Institute of Plant Physiology & Ecology Shanghai Institute for Biological Sciences Chinese Academy of Sciences Shanghai 200032 China

Photodynamics of peripheral antenna complexes,light-harvesting complex (LH2) of Rhodobacter (Rb) Sphaeroides 601,was studied using femtosecond pump-probe technique at different laser wavelengths. The obtained results reveal dramatic dynamical evolutions within B800 and B850 absorption bands of antenna complexes LH2. At excitation wavelength around 835 nm,a sharp photobleaching signal was observed which was assigned to the contribution of the two-exciton state,which was further confirmed by the power dependence measurement. Rate equations with eight-level scheme were used to calculate the population evolution in LH2 and the transient dynamics under femtosecond pulse excitation. The research results prove that not only the transition from ground state to one-exciton state but also that from one-exciton state to two-exciton state contribute to the photodynamics of B850.

关键词：受激状态动力学方程式探针技术

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Time-Resolved Fluorescence Study of C_(60) Solution

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Chinese Physics Letters 1994年第3期11卷 137-140页

作者： SONG Jie LI Feiming qian shixiong LI Yufen PENG Wenji ZHOU Jianying YU Zhenxin Department of Physics Fudan UniversityShanghai 200433 Ultrafast Laser Spectroscopy Laboratory Zhongshan UniversityGuangzhou 510275

Using a picosecond excitation source and a time-resolved streak camera detection system,the time-resolved fluorescence spectra of purified C_(60) have been recorded from toluene solution at room temperature.A fluorescence peak at about 730nm was detected and its lifetime was directly determined to be 1.1±0.1 *** fluorescence peaks obtained from the mixture of C_(60) and C_(70) at 676 and 696nm were mainly related to C_(70) content.

关键词： temperature. resolved Fluorescence

STIMULATED RAMAN OSCILLATION FROM THE DROPLETS BY ULTRASHORT LASER PULSE

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Chinese Physics Letters 1988年第5期5卷 205-208页

作者： qian shixiong WANG Jun LI Yufen Department of Physics Fudan UniversityShanghai

We have measured the picosecond Stokes oscillation from CC14,C_(6)H_(6) and other droplets with about 70 micrometer *** obtained oscillation can reach 8th *** explanation for the differences between the Stokes oscilla... 详细信息

关键词： order. oscillation LASER

Power Dependence of the Recombination Processes in the In_(x)Ga_(1-x)As/GaAs Single Quantum Well

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Chinese Physics Letters 1991年第8期8卷 428-431页

作者： qian shixiong WU Jianyao YUAN Shu LI Yufen Thorwald G.Andersson CHEN Zonggui PENG Wenji SHE Weilong YU Zhenxin Department of Physics Fudan UniversityShanghai 200433 Department of Physics Chalmers University of TechnologyGoteborgSweden Institute of Semiconductor Academia SinicaBeijing 100083 Institute of Laser Spectroscopy Zhongshan UniversityGuangzhou 510275

We have measured the power dependence of the photoluminesence spectra from a set of strained In_(x)Ga_(1-x)As/GaAs single quantum *** result shows that the excitation power has important effect on the carrier recombination *** the power increases from 0.5 to 14mW,the photoluminescence from the barrier becomes more intense than that from the well and the trapping efficiency *** high excitation level,the ratio of the radiative recombination rate to the nonradiative recombination rate of the barrier increases ten times than that at lower excitation level,while it only doubles for the well.

关键词： As/GaAs excitation barrier

TIME-RESOLVED PHOTOLUMINESCENCE FROM In_(x)Ga_(1-x)As/GaAs SINGLE QUANTUM WELL

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Chinese Physics Letters 1989年第12期6卷 559-562页

作者： qian shixiong YUAN Shu LI Yufen T.G.Andersson CHEN Zonggui PENG Wenji YU Zhenxin Department of Physics Fudan UniversityShanghai 200433 Department of Applied Physics Charlmers University of TechnologySweden Institute of Semiconductor Academia SinicaBeijing100083 Institute of Laser Spectroscopy Zhongshan UniversityGuangzhou 510275

We have measured the time-resolved photoluminescence spectra of several In_(x)Ga_(1-x)As/GaAs single quantum well samples at *** different temporal behaviors of the photoluminescence(PL)from the GaAs layer and the excitonic emission from the In_(x)Ga_(1-x)As well were *** lifetime for the exciton in the In_(x)Ga_(1-x)As well were determined to be *** trapping efficiency of the well to the carriers was about 80%.

关键词： As/GaAs As x

Femtosecond Nonlinear Birefringence and Dichroism in Au:TiO_2 Composite Films

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光学学报 2003年第S1期23卷 78-79页

作者： Guohong Ma Jun He Sing-Hai Tang shixiong qian Department of Physics, National University of Singapore, Singapore 119260 Department of Physics, Fudan University, Shanghai 200433, P. R. China Department of Physics National University of Singapore Singapore 119260 Department of Physics Fudan University Shanghai 200433 P. R. China

Au:TiO2 nanocomposite film was fabricated by rf-sputtering. Both real and imaginary parts of x(3) were investigated by optical Kerr effect and pump-probe methods with femtosecond pulse with values of about 10-8 esu.

关键词： in on with TiO Femtosecond Nonlinear Birefringence and Dichroism in Au that real of

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