排序方式: 共有39条查询结果,搜索用时 171 毫秒
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A THEORETICAL AND EXPERIMENTAL STUDY OF FREQUENCY REDSHIFT IN OPTICAL-FIELD-INDUCED FREEDERICKSZ TRANSITION IN A NEMATIC LIQUID CRYSTAL FILM 下载免费PDF全文
The frequency redshift in the optical-field-induced Freedericksz transition in a nematic liquid crystal film is investigated, We derive a theoretical expression for the frequency shift, and then measure the temporal evolution of the frequency shift and the light-intensity de-pendence of the maximum frequency shift. The theory agrees with the measurements. 相似文献
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光学信息处理以其速度快、信息容量大、结构简单、可以同时完成二维或多通道运算等优点而被人们所重视,并已成为现代光学的重要组成部分.光学信息处理的基本装置可以分为以下几个主要部分:光源、输入转换器、光学处理系统以及输出转换器.目前,输入转换器主要通过感光胶片将输入信号或图象送入处理系统.光学处理系统是由透镜或其它全息光学元件构成的模拟运算系统,此系统中的空间滤波器是光学信息处理系统中的关键元件,必须根据具体课题的要求进行设计并用记录介质或其它材料来制备.输出转换器一般是用记录介质把处理结果记录下来,或通过摄像… 相似文献
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红外光谱法研究蓖麻油磺化过程 总被引:1,自引:0,他引:1
利用红外光谱法研究了蓖麻油的磺化过程,并以碘值为辅助,得出了蓖麻油磺化过程的反应规律。反应过程中蓖麻油的双键和羟基同时参与磺化反应,蓖麻酸甘油酯发生水解反应。 相似文献
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Transverse spatial modulation of beam profiles for a probe beam counterpropagating to a pump beam in a 45°-cut BaTiO3:Ce crystal with an externally applied electric field is studied numerically studied. For the case that the direct ion of the external field makes an angle of 45° with the c-axis of the crystal, the probe beam, which propagates in the direction perpendicular to the external field and has a waist wider than that of the pump beam, can acquire deep spatial modulation. In contrast, the pump beam shows no spatial modulation but diffracts only. For the case the external field is directed opposite to the direction mentioned above, the probe beam shows much stronger spatial modulation as compared to the pump. 相似文献
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A CONTINUOUS COMPOUND FOUR-WAVE MIXING MECHANISM FOR SELF-PUMPED PHASE CONJUGATION IN BaTiO3 CRYSTALS 下载免费PDF全文
A continuous compound four-wave mixing mechanism for sell-pumped phase conjugation in photorefractive crystals is presented. The coupled-beam equations of this mechanism are solved numerically when depletion of the forward going beam is neglected. The experiment in a Ce-doped BaTiO3 crystal is performed, with the stable phase conjugate reflectivity of as much as ≥80%. The curved high output phase conjugate intensity are explained using the numerical results. 相似文献