高功率激光装置输出光束相对光谱功率测量方法

Relative spectral power measurement of laser-pulse for high power laser facility

针对SILEX-I超短超强脉冲激光装置输出光束光谱分布的精密测量问题,采用脉冲激光相对光谱功率来评价光谱分布,以溴钨灯为标准光源开展相对光谱功率测量方法的研究,获得相对光谱功率的理论计算公式。以SP2760光栅光谱仪作为光谱测量设备在SILEX-I激光装置上进行了光谱分布测量的验证实验,并给出了不确定度评定,获得了扩展相对不确定度1.7%的测量精度。测量结果显示,相对光谱功率分布与光栅光谱仪的原始光谱响应值分布具有显著的差异,可以更加准确地反映输出脉冲的光谱分布。

The relative spectral power is used for evaluating the spectral distribution ot uttraslaort laser pulse, lne reiauve spectral power measurement for ultrashort laser pulse is studied based on the standard illuminant of bromine-tungsten lamp, and analytical expressions of the relative spectral power are clearly given. Experimental results for the relative spectral power measurement on SILEX-I laser facility using SP2760 spectrometer show that the spectral distribution evaluated by the relative spectral power is significantly different comparing with the original spectral response. The uncertainty-analysis of experimental results is also given, and the extended relative uncertainty is 1.7 %.