大口径高功率激光能量测量吸收体研究

高峰值功率能量测量中吸收体的选择,将影响到高功率激光能量计测量准确性。设计了一种大口径高峰值功率体吸收型激光能量测量探头,利用有限元软件,对激光能量测量光热转换的相关过程进行了模拟研究,研究表明对400 mm×400 mm口径、1053 nm波长、3 nm脉宽、3000 J量级单脉冲激光能量测量,选择吸收系数在400～600 m^-1的玻璃作为吸收体最为合理。

Study on the absorber in the measurement of large aperture high peak power laser

Absorber will affect the accuracy of the measuring of high peak power laser.In this work,a large aperture high peak power laser energy detector is designed.A finite-element method is employed to simulate the space-and time-dependence of temperature in the volume absorber.A three-dimensional model is built to study the heating effects of a single pulse at 1053nm by using different absorbers.The results indicate that： for lasers with aperture of 400 mm×400 mm and 3 ns pulse length,the most suitable absorber is that with absorption coefficient from 400 m^-1 to 600 m^-1.