侧面抽运板条激光介质动态热畸变测量方法

研究了基于干涉测量激光介质热畸变的原理,利用CCD摄像机记录干涉条纹并通过计算机图像处理,来测量板条激光介质动态热畸变的方法。对采集得到的干涉条纹进行图像处理,提出了一种简单快速提取条纹中心的算法。通过分析、计算干涉条纹的移动,得到抽运过程中板条激光介质的动态热畸变情况,为动态补偿激光介质热效应提供了可能。实验采用了N31磷酸盐激光玻璃作样品,得到了加热过程中激光玻璃内部的温度分布,误差约为3%,验证了该测量方法的可行性。

Based on the measurement theory of laser medium thermal abberation with interference fringe, a method is proposed to measure the dynamic thermal abberation of slab laser medium. The interference fringe is recorded by charge coupled device (CCD) cameral and then processed by computer. With analysis of the interference fringe, a simple and rapid algorithm to extract the center of interference fringe is proposed. The dynamic thermal abberation of slab laser medium in pumping process by analyzing and calculating the movement of interference fringes is obtained, which paves the way to dynamically compensating the thermal effect of the laser medium. In experiments, N31 phosphate laser glass is used as the sample, and the interior temperature distribution during heating procedure is obtained. The relative error is about 3%, and the validity of the method is proved.