宽带低相干光单次时间相干性测量研究

传统测量光束时间相干性的方法是通过机械扫描的方式实现的，这种方法不能够实现单次测量，而且对于相干时间较短的宽带光测量误差较大。本文提出了一种单次时间相干性测量的新方法，通过给迈克尔逊干涉仪的反射镜引入楔角，使光束波前产生随位置变化的延迟差，可从单次测量的一幅干涉图中计算提取出光场完整的时间相干性信息。实验中测量了不同宽带入射光的时间相干性，均与理论结果吻合较好。单次时间相干性测量的方法将为高功率宽带激光装置提供更为方便的时间相干性测量手段，提高实验测量效率。

Single-shot measurement method of temporal coherence for low-coherence broadband light

The traditional method of measuring temporal coherence is realized by means of mechanical scanning. However, this method can not be used for single-shot measurement, and the measurement error is larger for broadband light. In this paper, a new method is proposed for measuring temporal coherence properties through one shot. By tilting one mirror of Michelson interferometer, the delay difference of beam wavefront varying with spatial position can be obtained. The temporal coherence information of light field can be calculated and extracted from a single interferogram. The temporal coherence of different broadband light is measured in the experiment, which is in good agreement with the theoretical results. The method will provide a more convenient measurement to temporal coherence for high-power broadband laser device, and improve the measurement efficiency.