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利用激光感应瞬态光栅技术测量超短激光脉冲宽度 总被引:1,自引:0,他引:1
描述了利用激光感应瞬态光栅技术测量超短脉冲激光的脉冲宽度和相干时间的方法,来自同一光源的两束激光在非线性介质中相干形成积分光栅,测量光栅自衍射强度与两束光脉冲之间的延迟时间关系,利用相干光束的四阶相干函数关系,可以求出光源的脉冲宽度和相干时间。 相似文献
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一种新型偶氮化合物中的高效率实时全息光栅的实验研究 总被引:1,自引:0,他引:1
合成了一种新的含偶氮基的三元共聚物,由于在主链中链接柔性基团,使其具有相对较低的玻璃化温度,在633nm处光感生双折射δn值可达10^-3量级。实验上获得了几个乃至几百微米厚的具有高光学无效性的薄膜,在633nm波长处写一息光栅的实时单光束衍射效率可达10%以上。 相似文献
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基于激发态电子占有率表达式和Frank-Condon 因子唯象公式, 当染料激发态振动能级单模振动频率为0.2 eV和TiO2纳晶半导体导带宽为1.4 eV时, 从理论上研究了取不同重组能、注入能级位置和初始振动波包时激发态振动能级间振动相干效应对光致电子转移速率的影响. 与文献的理论结果比较, 证实了唯象公式的合理性, 其相关修正参数分别为A=16, B=0.4735, C=0.1. 本文的工作将为进行光致电子转移速率的实验研究和染料敏化太阳能电池的应用研究提供理论基础和指导. 相似文献
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Vibrational relaxation dynamics in transient grating spectroscopy studied by rate equations based on time-dependent correlation function
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A modified model, a set of rate equations based on time-dependent correlation function, is used to study vibrational relaxation dynamics in transient grating spectroscopy. The dephasing, the population dynamics, and the vibrational coherence concerning two vibrational states are observed respectively in organic dye IR780 perchlorate molecules doped polyvinyl alcohol matrix. The result shows that in addition to the information concerning system-environment interac- tion and vibrational coherence, the vibrational energy transfer can be described by this modified model. 相似文献
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Coherent coupling between vibrational modes of C-H bonds at different positions studied by femtosecond time-resolved coherent anti-Stokes Raman scattering
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We performed femtosecond time-resolved coherent anti-Stokes Raman scattering(fs-CARS) measurements on liquid toluene and PVK film.For both samples,we selectively excited the CH stretching vibrational modes and observed the expected quantum beat signals.The frequency of the well-defined beats is in good agreement with the energy difference between the two simultaneously excited modes,which demonstrates that a coherent coupling between the vibrational modes of the C-H chemical bonds exists at the different positions of the molecules.The dephasing times of the excited modes are obtained simultaneously. 相似文献