基于长波红外探测器绝对光谱响应度测量的激光源

Laser source used for measurement absolute spectral responsivity of long-wave infrared detectors

为满足长波红外探测器绝对光谱响应度参数的高准确度测量要求,提高长波红外激光的功率稳定性,优化激光光束质量,研制了一套长波红外激光源。针对Cd Te晶体的电光效应设计了一套提高长波红外激光功率稳定性的实验系统。利用激光光束传输原理设计了长波红外波段空间滤波器,并分析了其各项参数的计算方法。实验结果表明:长波红外激光的光功率不稳定度提升至0.1%以上,长波红外激光的光束质量也得到显著提升,满足了长波红外探测器绝对光谱响应度高准确度测量对光源的性能要求。

In order to measure the absolute spectral responsivity of long-wave infrared detectors with high accuracy, improve the long-wave infrared laser power stability and beam quality, a set of long-wave infrared laser source was developed. In this laser source, a feedback-control system, based on the electro- optics effect of CdTe crystal, was designed to improve the stability of long-wave infrared laser power and a long-wave infrared spatial filter, based on the propagation properties of laser beam, was designed to improve the long-wave infrared laser beam quality. The parameters of the spatial filter were also analyzed in this paper. Experimental result shows the laser power stability is elevated to above 0.1% and laser beam quality is improved obviously. The reliable laser source is provided to measure absolute spectral responsivity of long-wave infrared detectors with high-accuracy.