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Off-Bragg analysis of the diffraction efficiency of reflection photorefractive holograms

机译:反射光折变全息图衍射效率的非布拉格分析

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摘要

Formulas are given for the calculation of diffraction efficiency of reflection-type gratings recorded in a photorefractive medium. The analysis incorporates the coupled-wave theory that was developed for photorefractive hologram gratings. This analysis takes into account grating slant with respect to the medium surface, light absorption during reconstruction, any incident angle of the reference beam, and any photorefractive phase shift. General solutions for signal and reference wave functions are given in a closed-form expression by use of a hypergeometric function. The optimum media parameters and recording conditions for high diffraction efficiency are obtained by the derived formulas. The diffraction properties for off-Bragg conditions are also discussed.
机译:给出用于计算记录在光折射介质中的反射型光栅的衍射效率的公式。该分析结合了为光折射全息图光栅开发的耦合波理论。该分析考虑了相对于介质表面的光栅倾斜,重建期间的光吸收,参考光束的任何入射角以及任何光折射相移。信号和参考波函数的一般解决方案通过使用超几何函数以闭式形式给出。通过推导的公式可以得到高衍射效率的最佳介质参数和记录条件。还讨论了非布拉格条件下的衍射特性。

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