基于量热法的高功率激光功率测试技术

Power measurement technology of high power laser based on calorimetric method

针对高功率激光功率的测试,尤其是高功率激光器烤机时的长时间测量需求,设计了基于水冷却的激光功率测量方法。利用热敏电阻测量冷却水进水口和出水口的温差计算激光功率。利用有限元仿真软件建立了吸收腔热路结构的三维有限元模型,并对不同口径的冷却水路进行模拟仿真。测试结果表明,用该方法测试高功率激光功率,测量相对误差可以保证在1.6%以内。

Aiming at the power measurement of high power laser,especially the long-time measurement requirements of high power laser,a laser power measurement method based on water cooling was designed.The laser power was calculated by measuring the temperature differences between the cooling water inlet and the outlet with the thermistor.The three-dimensional finite element model of the heat path structure of the absorption cavity was established by using the finite element simulation software,and the cooling water paths of different calibers were simulated.The test results show that testing the power of high power laser with this method,the measurement relative error can be guaranteed to be within 1.6%.