Experiment Ｒesearch on Spectrum Drift Characteristic at 77 K of Infrared Band-Pass Filters
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Citation
田亚 (TIAN Ya), 张磊 (ZHANG Lei), 林国画 (LIN Guo-hua), 方志浩 (FANG Zhi-hao), & 付志凯 (FU Zhi-kai). (2020). 红外带通滤光片 77 K光谱漂移 特性实验研究 (Experiment Ｒesearch on Spectrum Drift Characteristic at 77 K of Infrared Band-Pass Filters). 红外 (INFＲAＲED (MONTHLY)), 41(5), 19-22. https://doi.org/10． 3969 / j． issn． 1672-8785． 2020． 05． 003
Keywords
- Infrared
- Band-pass filter
- Low temperature
- Spectrum drift
- 77 K
- Band-pass filter
- Cutoff wavelength
Brief
The study experimentally demonstrates that the front cutoff wavelengths of infrared band-pass filters shift towards shorter wavelengths at 77 K, with the magnitude of this shift being primarily influenced by the working waveband, where longer wavelengths exhibit larger drifts, while the substrate material has a minimal effect.
Summary
Infrared filters used in detectors shift their spectral range when cooled to 77K. Specifically, the start of their transmission range (front cutoff wavelength) moves towards shorter wavelengths. The amount of this shift is bigger for filters designed for longer wavelengths (like long-wave and very long-wave infrared. The material the filter is made from has a smaller impact on this shift. This information is important for designing accurate infrared detector systems.
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