局域体全息光栅的衍射特性

基于三维耦合波理论，研究了两束有限宽度的任意偏振平面波干涉产生的局域体全息光栅的衍射问题。以单位均匀振幅的任意偏振平面波为例，给出了透射波和衍射波振幅的主分量和交叉分量的解析表达式，讨论了记录过程和再现过程中入射的参考光波的偏振角对透射波和衍射波振幅的影响。计算结果表明，记录过程中的偏振角越小，形成的光栅内的耦合越强，衍射效率越高，但光束质量越差；再现过程中不同的偏振角，由于入射波和衍射波的电矢量的不同方向的耦合强弱不同，透射波和衍射波振幅的主分量和交叉分量的振幅变化行为不同。

Diffraction Characteristics of Local Volume Holographic Gratings

Based on the three- dimensional coupled wave theory, the theory of diffraction of local volume holographic gratings recorded with arbitrary polarization plane waves is studied. Simple analytical expression for the amplitude profiles of the main component and cross component of transmitted and diffracted waves are obtained. The influence of the polarized azimuths of the incident wave during recording and reconstruction on the amplitude of the transmitted and diffracted waves is discussed. It is demonstrated that the conversion is seen to proceed more quickly for reducing the polarized azimuth at recording, but the output beam deviates more and more from the uniform amplitude distribution. It is also shown that owing to the different coupling values of between the diffracted and incident beams inside the grating from different directions of the electric vector, the amplitude profiles of the main component and cross component of the output beam are different from each other when the polarized azimuth at reconstruction is different.