高功率固体激光器光路自动准直算法与流程优化
Optimizing on Algorithm and Flow of Beam Alignment in High Power Solid-State Laser Driver
中国工程物理研究院 激光聚变研究中心,四川 绵阳 621900
摘要
光路自动准直系统用于高功率固体激光装置光路自动调整,确保从预放注入的光束准确地通过主放大级光路到达靶点,准直算法和流程控制是光路自动准直的两项关键技术。针对神光-Ⅲ原型装置光路自动准直系统的腔镜准直算法,基于图像处理技术,提出了基于空间滤波小孔图像信号区域面积最大,长短轴控制以及x,y轴长度控制3种算法。在原型装置上开展的实验表明,x,y轴长度控制算法最有利于准直闭环控制的实现,其准直精度优于90 μm。在自适应波前校正系统完成波前预校正后,针对灰度分布变化的远场图像,再使用光路自动准直系统,对光束远场重新准直定位。结果表明,优化后的准直流程可以消除波前预校正对光束远场定位的影响。
Abstract
The beam automatic alignment system is used to adjust the beam of high power solid-state laser driver and to make the beam accurately point to target. Algorithm of alignment and flow control are two key techniques on beam automatic alignment. Considering the algorithm on alignment of cavity mirror in technical integration experiment line (TIL),three kinds of algorithms:the largest area of image signal,control of long-short axes and the length of x-y axes control are put forward based on image processing. The experiment on TIL indicates that the length of x-y axes control is propitious to closed-loop control of alignment,and the alignment accuracy is less than 90 μm. After wave-front adjusting,alignment system is used to point the far-field again. Result indicates that the influence of the adaptive optics system which makes the far-field alignment error will be able to eliminate.
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