Abstract
Medium and long wave infrared (MDIR) filters are one of the key devices on aerospace optical remote sensing cameras. The spectral response of the high-resolution detector is determined by the spectral characteristics of the filter, of which the medium and long wave infrared accounts for a large proportion. The medium and long wave infrared filter prepared in the traditional way has a gap with the theoretical value, which makes the medium and long wave infrared filter suffer from spectral angular drift or temperature drift, resulting in a mixed superposition of high-frequency and low-frequency spectra in the high-resolution detector, leading to distortion of the recovery spectrum. This paper presents the design and spectral characteristic of a medium and long wave IR filter using for high-resolution detectors in the operating band 3.7 μm–6.2 μm. In order to achieve the wavelength-specific filtering characteristics of the medium and long wave IR filter (99% or more pass-through in the 3.7 μm–6.2 μm band and cut-off in the 2.7 μm–3.65 μm and 6.25 μm–7.2 μm bands), a structural iteration was carried out using Si material as the filter substrate and a band-pass filtered high and low reflectivity film stack structure. The structure of the film is designed with TiO2 for the high refractive index and SiO2 for the low refractive index. The number of layers is greatly reduced, and the medium and long wave infrared filter achieves a dual-band front-to-back cut-off and high transmittance through temperature drift tests, angular drift tests, spectral characteristic and surface shape tests. Environmental tests have shown that the medium and long wave infrared filters are well matched to the substrate material and have high stability, making them suitable for the harsh temperature variations and high-energy particle irradiation in space.
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Chen, Y. et al. (2023). Design and Spectral Analysis of Medium and Long Wave Infrared Filter for HRD. In: Urbach, H.P., Jiang, H. (eds) Proceedings of the 7th International Symposium of Space Optical Instruments and Applications. ISSOIA 2022. Springer Proceedings in Physics, vol 295. Springer, Singapore. https://doi.org/10.1007/978-981-99-4098-1_45
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DOI: https://doi.org/10.1007/978-981-99-4098-1_45
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