红外带通滤光片77K光谱漂移特性实验研究

Experiment Research on Spectrum Drift Characteristic at 77K of Infrared Band-Pass Filters

红外带通滤光片是决定红外探测器组件光谱响应范围的重要元件。滤光片光谱的截止波长在低温下会产生漂移,从而影响组件的光谱响应范围。为探究滤光片在低温下的光谱漂移情况,选取了几种典型的红外带通滤光片,并分别在常温和77 K温度下使用自制的低温光谱测试杜瓦对其进行了光谱测试。结果表明,低温下滤光片的前截止波长均向短波方向漂移。该漂移量的大小主要与工作波段有关。工作波长越长,漂移量越大。中波红外带通滤光片的截止波长在低温下的漂移量小于100 nm。基片材料对截止波长漂移的影响较小。该结论对于红外探测器滤光片的光谱设计具有重要的参考价值。

Infrared band-pass filters are important components of infrared detectors to determine spectral response range.But cutoff wavelengths of the spectrum of infrared band-pass filters drift at low temperature,which influences spectral response range of infrared detectors.In order to explore the spectrum drift of the filters at low temperature,several typical infrared band-pass filters are selected and the self-made low temperature spectral test dewar is used to carry out spectral test at room temperature and 77 K respectively.The results show that the front cutoff wavelengths of tested filters all drift toward short wavelength direction at low temperature,and the drifts are mainly related to the waveband of filters.The drifts increase as the waveband increases.The drift of the cutoff wavelength of the medium band-pass filter is less than 100 nm at low temperature.The substrate material has little influence on the cutoff wavelength drift.The conclusion has important reference value for the spectral design of infrared detector filters.