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由于液晶的独特性质,使得激光领域中的一些难题有希望获得解决,本文叙述液晶在全息照相中的两项应用,它很好地解决了在微波全息照相的记录中以及波前重现中的悬而未决的难题。一、应用向列液晶屏消除全息图再现象中的干涉斑点在观看重现的全息图象时,虽然能看到与真实物体一模一样的图象,但同时在图象上却会出现飘忽不定的斑点,这就是激光显象时产生的斑点效应。这种现象的基本特征是:1.亮的及暗的斑点出现在重现的三维象上,斑点的大小决定于观察距离和被观察光波的角直径2.这种斑点的效应会由于观察者的运动而运动,而运动方向则对不同的观察者是不同
Due to the unique properties of liquid crystal, some problems in the field of laser are hopefully solved. This article describes two applications of liquid crystal in holography, which is a good solution to the problem of holographic recording in microwave and wavefront reproduction Unresolved problems. First, the application of nematic liquid crystal screen to eliminate interference spots in the hologram reoccurrence phenomenon While viewing the reproduced holographic image, although you can see exactly the same image with real objects, but at the same time there will be erratic in the image Spots, this is the speckle effect of laser imaging. The basic characteristics of this phenomenon are: 1. Bright and dark spots appear in the reproduced three-dimensional image, the size of the spot depends on the observation distance and the angle of the observed light wave diameter 2. The effect of this spot will be due to the observer Of the movement and exercise, and the direction of movement is different for different observers