基于光斑轮廓特征的激光光束质量简易评价方法

Evaluating Specifications of Laser Beam Quality Based on Beam Profile

提出一种非实验室条件下激光光束质量的简易评价方法,通过检测激光光斑轮廓特征来评价激光光束质量。根据原理定义一组表征激光光束质量的参量,给出测量方案和算法。利用灯抽运Nd∶YAG电光调Q脉冲激光器测试了谐振腔镜倾斜和不同调Q状态两种失调态时激光器参量值的变化规律,结果显示参量值随着失调量增加而单调增大,当失调量较大时,可以用相邻两截面上参量差值的平均值来评价激光光束质量。研究结果表明,所提出的简易评价方法能够有效地评价激光器激光光束质量,测量过程仅需要光敏相纸、数码相机以及计算程序。对实验条件要求低,可用于非实验室条件下激光器工作状态的初步检测。

A simple evaluation method of laser beam quality used out of laboratory is proposed. Through detecting profiles of laser spots, laser beam quality is measured. According to the principles, a suite of parameters are defined to express beam quality, what is more, the measured schemes and algorithms are shown. The relationship between output energy and misalignment is researched in both mirror slanting and change of Q-states based on electro-optic Q-switch pulse laser pumped by lamp. Experimental results show that new parameters increase with the increase of misalignment and average value of parameter difference on adjacent two sections can be used to evaluate beam quality in large amount of disorder. These results indicate that valuating specifications presented can be used to evaluate beam quality and only light-sensitive photographic paper, digital camera and calculation procedure are used in the process. For simple measuring method and low experiment condition requirement, it can be used in preliminary detection of laser working position out of laboratory.