掺锰的钾钠铌酸锶钡晶体中双光束诱导光学二极管效应

两束波长为632.8nm的He-Ne激光在掺Mn的钾钠铌酸锶钡(KNSBN)晶体中对撞,诱导产生一个光学二极管,当两束光同时存在且入射功率分别为0.876mW和0.0914mW时,光学二极管两个方向上的等效透射率之比达202,并有继续增大的趋势。     

STUDIES ON THE DYNAMICS OF OPTICAL BISTABILITY SWITCHING IN THE INTERNAL FABRY-PEROT CAVITY WITH A CdSxSe1-x-DOPED GLASS CHANNEL WAVEGUIDE

We report the optical bistability in CdS_xSe_1-x-doped glass channel waveguide with rise and fall times of about 24 and 30ps, respectively, in bistable switching by means of fiber coupling input with a power of about 3mW. The third-order nonlinear susceptibility (x⁽³⁾) of CdS_xSe_1-x-doped glass is estimated experimentally to be 1.8×10^-9 esu. The high speed switching and the value of x⁽¹⁾ show that the optical bistability is caused by an optical nonlinearity which can be attributed to the band-filling effect.     

相位共轭皮秒光脉冲的直接观察和记录

利用条纹照相机直接观察和记录了由全息相位共轭技术产生的相位共轭的皮秒光脉冲。实验结果与理论相符合。 关键词：     

Ce:KNSBN晶体中ps激光脉冲二波耦合的直接观察与记录

重复频率为82MHz的ps激光脉冲可在慢响应的光折变晶体Ce:KNSBN中实现二波耦合。本文报道用条纹照相机直接记录的实验结果并给出解释。 关键词：     

TIME DECAY BEHAVIOR OF FULLERENE-C60 STUDIED BY TIME-RESOLVED PHOTOLUMINESCENCE

The time-resoved photoluminescence spectra of C₆₀ have been studied from toluence solution at room temperature and from thin film at both room temperature and 77K. A photoluminescence peak at about 730nm was detected from solution at room temperature and film at 77K, in which lifetimes waz determined to be 1.1 and 0.9ns, respectively. At room temperature, the photoluminescence peak of thin film shifted to 740 nm with fast decay behavior which was fitted well to a double-exponential lifetimes with τ₁ = 0.087ns, τ₂= 0.68 ns. Two relaxation mechanisms are given tentatively in explaining this phenomenon.     

光折变晶体中二波耦合光强依赖皮秒光脉冲整形

波长为532nm、主脉冲脉宽为55ps、重复频率为82MHz的激光脉冲列在掺Ce的KNSBN晶体中进行二波耦合.当探测脉冲(倒空脉冲)相对于泵浦脉冲有一定时间延迟时,泵浦脉冲发生整形.整形效果随入射总光强的增大而变得越来越明显.实验结果与理论符合很好.     

基于新型非线性耦合腔锁模过程的时域理论分析

系统地研究了用带有非线性倍频晶体的附加耦合腔来压窄激光光脉冲的动力学作用过程，报道了该锁模激光系统在瞬态平衡时输出脉冲宽度的具体表达式；另外，通过数值分析计算，给出了该系统锁模激光输出特性优于单腔情形的原因。 关键词：     

著名的光谱物理学家高兆兰教授

高兆兰教授投身于我国科学教育事业将届50年,桃李天下,英华佼佼。以其渊博的专业知识、严谨的治学精神和对后辈的热情扶掖而著称于我国科技教育界。她是新中国光学光谱学教学与研究的最早开拓者之一。     

光折变晶体中二波耦合光强依赖现象和各向异性热透镜效应

实验发现,掺Ce离子的光折变晶体KNSBN中二波耦合光强依赖现象和各向异性热透镜效应有共生关系.光吸收引起晶体温升乃至引起.光折射率的增加是产生这种现象的主要原因. 关键词：     

A STUDY ON THE ULTRASONIC VELOCITY AND ATTENU-ATION IN NdFeB MAGNET WITHIN THE TEMPERATURE RANGE OF 80-300K(Ⅰ)

The ultrasonic velocity V and attenuation A of both longitudinal and shear waves in an anisotropic NdFeB magnet were measured over the temperature range from 80K to 300K by the pulse echo method. The anisotropy of the ultrasonic wave propagating in a NdFeB magnet was observed. Anomalous changes in both V-T and A-T curves in the temperature range of 110-160K were found, which might be due to the spin reorientation phase transition of Nd₂Fe₁₄B.