飞秒时间分辨光学多道谱仪研究

Investigation of Femtosecond Time-resolved Optical Multichannel Spectrometer

中文关键词:  飞秒  超快时间分辨光谱  非线性光学  激光

英文关键词:Femtosecond  ultrafast time resolved spectroscopy  nonlinear optics  laser

中文摘要:

      超快时间分辨光谱学为研究非线性光学、固体物理、化学反应动力学、能量传递和驰豫、生物过程动力学和相干光谱技术提供了一种有效的工具.本文报导了一种飞秒时间分辨光学多道光谱设备,该设备是由一台用氩离子激光器泵浦且产生100fs光脉冲并调谐在720-980nm的飞秒掺钛兰宝石激光器、改进了的光学多道分析器(OMA-Ⅱ)、386计算机及光学系统组成的.激光脉冲用LBO晶体倍频.谱仪装置的时间分辨率约120fs,光谱分辨率小于1nm.利用这种光谱仪我们研究了光系统Ⅱ反应中心的能量传递和电子激发转移.最近我们还测量了PSⅡ反应中心核心复合物和PSⅡ颗粒在有或没有激发光情况下的吸收率的变化,利用兰光激发电荷分离时间约3ps.

英文摘要:

      Ultrafast time-resolved spectroscopy provides a pewerful technique for studying the nonlinear optics,solid state physics, chemical reaction dynamics, energy trnsfer and relaxation,dynamics of biolotical processes and coherent spectroscopic techniques.In this paper we report a femtosecond time-resolvedoptical multichannel spectroscopic arrangement.This arrangement consists of a femtosencond Ti sapphire laser pumped by argon ion Which Produces 100fm laser pulses centered between 720-980nm an improved variety of OMA-Ⅱ,a 386 computer and an optical system. Laser pulses are doubled with a thin LBO crystal.The time resolution of this spectroscopic arrangement was ～120fs and spectral resolution was less than 1 nm.Using this spectrometer we investigated the energy transfer and electronic excitation transport in photosystem Ⅱ reaction center. Recently we have measured the variation in difference absorptivity for the core complex of PSⅡ reauction censed and PSⅡ granule under laser excited and not excited. Charge Separation time was ～3ps with blue light exdtation.