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THEORETICAL STUDY ON TRANSMISSION OF RAPIDLY PHASE-MODULATED SIGNAL IN PHOTOREFRACTIVE TWO-WAVE MIXING
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The transmission of rapidly phase modulated signal beams in photorefractive two-wave mixing is studied theoretically. The analytical expressions of output intensities are given both in diffusion regime and in drift regime. 相似文献
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EFFECT OF LIGHT-INDUCED SCATTERING ON DIFFRACTION EFFICIENCY IN PHOTOREFRACTIVE CRYSTALS 总被引:1,自引:0,他引:1
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The coupled wave equations and their analytic solutions in photorefractive crystals are presented for the case of two-beam writing, while the light-induced scattering is considered, Using this result, the diffraction efficiency for each writing beam is discussed in doped KNSBN crystals with unidirectional fan, which is explained theoretically and verified exper-imentally. 相似文献
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自泵浦位相共轭反射的实验研究 总被引:1,自引:1,他引:0
本文通过检测BaTiO_3晶体的二波耦合增益系数P和自泵浦位相共轭反射率R对随入射角的变化关系,经过理论分析指出R的角度依赖性是P的角密依赖性的结果;详细地解释了全内反射自泵浦位相共轭的双区域耦合理论,指出位相共轭输出的频移特性是泵浦光在双区域间“振荡”的结果;并解释了自泵浦形成的阈值特性。 相似文献
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本文提出了利用相干光学处理系统进行语音信号频谱分析的技术。此技术以牺牲光学系统的多通道处理能力为代价,实现具有较大时间带宽积的语音信号的频谱分析。文中对此相干光学系统进行了简要的分析并提供若干实验结果。 相似文献
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INCOHERENTLY COUPLED SCREENING-PHOTOVOLTAIC SOLITON FAMILIES IN BIASED PHOTOVOLTAIC PHOTOREFRACTIVE CRYSTALS 总被引:1,自引:0,他引:1
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It is shown that the existence of incoherently coupled screening-photovoltaic soliton families is possible in biased photovoltaic photorefractive crystals under steady-state conditions. These screening-photovoltaic soliton families can be established provided the multiple incident beams have the same polarization and wavelength, and are mutually incoherent. Such soliton families reduce to screening-photovoltaic soliton pairs when they contain only two components. Relevant examples are presented where the photovoltaic photorefractive crystal is of the lithium niobate type. 相似文献
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