大型激光装置束间同步抖动的高精度测量

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2 ps。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。

High precision time jitter measurement for large multi-beam laser facility

The time jitter should be detected and controlled accurately for multi-beam laser facility. In this paper, a spectral interferometry method is used to measure the time jitter between beams of the typical large laser facility SG-Ⅲ prototype in the running state. The basic principle to measure the time jitter using spectral interferometry is investigated theoretically. Several key parameters for measurement accuracy are analyzed. Experimental results prove that the spectral interferometry method applied to beam time jitter measurement is effective.