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在多路激光组合使用的大型激光装置中,需要对不同链路输出的激光进行严格的同步控制,以获得更高能量和更高强度的激光脉冲。介绍了利用光谱干涉方法测量大型激光装置中束间同步抖动的基本原理,分析了光谱仪分辨率、束间固有同步延迟等参数对测量精度的影响。在实验上第一次基于光谱干涉方法获得了国内典型的大型激光装置(神光-Ⅲ原型装置)束间同步抖动数据。实验结果表明,神光Ⅲ原型装置的束间同步抖动优于2ps。该方法与目前常用的方法(光电管结合示波器测试方法或者条纹相机测试法)相比具有更高的精度。实验获得的结果为超高峰值功率激光相干合成技术路线和相关误差控制方案的选取提供依据。
In the multi-channel laser combination of large-scale laser devices, the laser output of the different links need to be strictly synchronized to obtain higher energy and higher intensity laser pulse. The basic principle of using spectral interference method to measure the inter-beam synchronous jitter in large-scale laser devices is introduced. The influence of the resolution of the spectrometer and the intrinsic synchronization delay between beams on the measurement accuracy is analyzed. The first time in the experiment based on the spectral interference method, a typical domestic large-scale laser device (SG-Ⅲ prototype) beam synchronization jitter data was obtained. The experimental results show that the beam synchronization of the prototype SGT is better than 2ps. This method is more accurate than currently used methods (phototube combined oscilloscope test or streak camera test). The experimental results provide the basis for the selection of super-peak power laser coherent synthesis technology and related error control schemes.