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阐述与输入物面密贴的位相型光学元件：条形散斑屏、随机相移器和位相光栅在光学全息及信息处理中的重要应用；分析了三类元件在应用和制作中的共性问题及各自特点；针对这类银盐板遇光后黑化失效的弊病提出了避免的方法与工艺之改进。
Describes the phase-sensitive optical elements that are intimate with the input surface: the important applications of the strip-shaped speckle screen, the random phase shifter and the phase grating in optical holography and information processing; the common problems in the application and manufacture of the three types of elements are analyzed And their own characteristics. Aiming at the shortcomings of the blackening failure of such silver salt plates in case of light exposure, the method and the process improvement to be avoided are proposed.