在大型高功率激光系统中, 实时监测对激光能量传输控制起着重要的作用。通过对激光能量的实时检测, 可以准确判断高功率激光装置系统中每一个环节的工作状态, 对保证激光装置的正常运行, 缩短装置的发射周期, 提高激光装置的工作效率有着重要意义。而激光能量测量的线性度对激光能量测量准确度有着直接的影响。在大型激光装置中, 激光光束多、分布广, 且存在严重的电磁干扰和环境温度漂移, 成为影响激光能量测量的线性度、降低激光能量测量精确性的主要因素。利用热电偶材料来完成对激光能量的测量, 并通过改进探头结构和扣除本底、补偿电位的方法来克服激光能量测量中的温度漂移。实验研究表明, 采用本方法测量激光能量的线性度优于2%。

In large-scale high-power laser system, real time detecting is of great importance to laser energy transmission. There are a large number of beams and they are distributed in a large area, furthermore, intensive electromagnetic disturbing affects the linearity of the laser energy detecting severely. A method of measuring laser energy is introduced in this paper, which uses thermopile to change the laser energy, and analogue digital module to process the signal. Subtracting the background and compensating the potential to overcome the effects of the temperature drift is focused on. Optimizing linearity result is achieved in this paper. The linearity of laser energy measurement has been optimized to more than 2% in our method.