Chinese Journal of Lasers, Volume. 39, Issue 1, 107001(2012)

Design and Fabrication of 3.5~4.0 μm Band-Pass Filter Working at Cryogenic Temperature

Cai Yuan*, Liu Dingquan, and Luo Haihan
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    There is a very high requirement for the spectrum of the band-pass filter in the new generation meteorological satellite that at working temperature (92 K), the spectrum curve of the filter must be within an area restricted by an inner rim and an outer rim. Using germanium (Ge) and silicon oxide (SiO) as the higher and the lower refractive index materials respectively, a band-pass film system with 4 resonators is designed to obtain steep slopes at pass band boundaries. The ripple in the transmission region is flattened by means of optimizing the thickness of reflecting layers in the band-pass film system. The band-pass filter that satisfies the cryogenic spectrum requirements is designed, based on the refractive index versus temperature characteristic. Using vacuum evaporation technics and photometric extrema monitoring method, the band-pass filter has been developed and it meets the requirement of the inner-outer-rim specification at 92 K. In the transmission region, its maximum transmittance is 93.2%, the average transmittance is 91%, and the amplitude of the ripple is 5.2%.

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    Cai Yuan, Liu Dingquan, Luo Haihan. Design and Fabrication of 3.5~4.0 μm Band-Pass Filter Working at Cryogenic Temperature[J]. Chinese Journal of Lasers, 2012, 39(1): 107001

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    Paper Information

    Category: materials and thin films

    Received: Jul. 15, 2011

    Accepted: --

    Published Online: Nov. 15, 2011

    The Author Email: Yuan Cai (ssccyyss@yahoo.com.cn)

    DOI:10.3788/cjl201239.0107001

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