两束相干光进行干涉时,如果其中一束光的传输距离超过其相干长度,则会因为发生波面畸变而无法产生干涉现象。通过实验发现:在光束的迭加光路中加入光折变晶体,利用光折变晶体修复光波畸变波面的作用,能够很好的解决这种因波面畸变而无法产生干涉现象的情况。为实现光束的长距离干涉提供可行的方法。 When two beams of coherent light interfere with each other, if the transmission distance of one of the beams exceeds its coherence length, the interference phenomenon will not occur due to wavefront distortion. The experimental results show that adding photorefractive crystal in the superimposed beam path of the light beam and using photorefractive crystal to repair the wavefront of the light wave distortions can well solve the situation that the interference caused by wave distortion can not be produced. Provide a feasible method for long-distance interference of light beam.