一、引言接近平面的波前的曲率可用错位干涉仪检测。在错位干涉仪中,一部分波前和另一部分横向位移了的波前即错位波前产生干涉。使用空间和时间相干性强的激光,错位干涉仪可仅由一块光学平晶组成,平晶和入射波前保持某一角度。以便从平晶正面和背面上反射的波前错位产生干涉,如图1。平晶可用作检验激光束扩展器的调整和品质的极其简单的工具。这种方法具有较大的实用价 I. INTRODUCTION The curvature of a near-plane wavefront can be detected with a dislocation interferometer. In the dislocation interferometer, part of the wavefront and the other part of the lateral displacement of the wavefront or dislocation wavefront interference. Using a laser with strong spatial and temporal coherence, the dislocation interferometer can consist of only one optical flattened crystal, which maintains an angle with the incident wavefront. So as to interfere with the dislocation of the wavefront reflected from the front and back of the flat crystal, as shown in FIG. 1. Flat crystals can be used as an extremely simple tool for checking the adjustment and quality of laser beam expanders. This method has a greater practical value