用两次曝光相移全息干涉实现光学幅相转换

提出一种实现光学图像由纯振幅型转换为相应的钝相位型的新方法。该方法基于2次曝光光折变相移全息干涉，在光学4-f系统中，用振幅型空间光调制器(SLM)输入振幅(或强度)图像，用光折变晶体作为全息记录介质，经过2次曝光相移全息干涉记录，再由原参考光再现读出，可在输出面上得到与输入图像相应的空间相位分布。该方法可在光学信息处理相关领域应用。阐述了该方法的基本思想，进行了理论分析、计算机模拟和光学实验，实验结果与理论分析一致，表明该方法是可行的。

Optical Amplitude-Phase Conversion by Using Double-Exposure Phase-shifting Holographic Interferometry

A new method for conversing the spatial amplitude distribution of a given image into its spatially similar phase distribution was proposed.The implementation of the present method can be based on the double exposure photorefractive holographic phase-shifting interferometry,in which the optical 4-f system with an amplitude-only spatial light modulator(SLM) as the image input device and with the photorefractive crystals as holographic recording medium was employed.We present the fundamental idea on which the method is based and verify its effectiveness and correctness by experimental result.