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本文介绍全息法定性观察和定量测量红宝石脉冲激光的时间相干性(相干长度)和空间相干性。脉冲激光的瞬时性使一般的干涉遇到困难,而全息法可一次记录脉冲激光的所有相干性信息,然后用连续激光重现,从而可得到相干性的全貌。文中详细叙述了测量原理,导出测量方程,介绍相应的实验装置,列出实验结果并作简要的讨论。该方法简便、易行。定性观察直观,定量测量也具有一定的准确性。
This article describes the holographic statistic observation and quantitative measurement of ruby pulsed lasers' temporal coherence (coherence length) and spatial coherence. The instantaneous pulse laser so that the general interference difficulties, and holographic method can record all the coherence of pulsed laser information, and then use continuous laser reproduction, which can be coherent picture. The article describes the measurement principle in detail, derives the measurement equation, introduces the corresponding experimental device, lists the experimental results and makes a brief discussion. The method is simple and easy. Qualitative observation of visual, quantitative measurement also has a certain accuracy.