And the techniques of double-slit filter and "cross-filter" can be used to extract the near field wavefront of the laser beam with phase modulation and amplitude fluctuation.
而且，利用双狭缝滤波和“交叉滤波”技术能够提取出具有位相调制或者是具有振幅起伏的近场波面。
According to spatial filter character, a common slit can become a practical optical filter by adding two couples of shades.
根据空间滤波特点，在普通单缝上增加两对挡光片，使之成为一种实用的光学滤波器。
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