Medium wave infrared filter based on lead germanium tellurium high refractive index material

Abstract

The invention discloses a medium wave infrared filter based on lead germanium tellurium high refractive index material. The filter adopts lead germanium tellurium as high refractive index material. The refractive index of the lead germanium tellurium material is higher than the germanium material in the prior art, and the fundamental absorption edge position of the lead germanium tellurium material is near 3 um, and the lead germanium tellurium material can be applied in a medium wave infrared band. nH / nL specific value of the high-low refractive index material is improved, so that the number of filter film can be reduced, the strength of the film is improved, and spectrum performance of the filter can be improved.

Description

technical field [0001] The invention relates to an optical filter, in particular to a mid-wave infrared filter based on tellurium-germanium-lead high-refractive-index materials. Background technique [0002] Infrared filter is an important spectroscopic device, and its application has penetrated into many scientific and technological fields such as aerospace remote sensing, laser, communication, and analytical instruments. [0003] Infrared filters are made of a series, with high refractive index n H and have a low refractive index n L The film layer is alternately formed, and the film layer has a refractive index ratio n H / n L The larger the value is, the fewer layers are required to form an optical film. [0004] At present, the high refractive index material used in the mid-wave infrared band is mainly germanium, whose refractive index is 4.0, and the material with the highest refractive index known to be used is lead telluride, whose refractive index is as high as ...

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Problems solved by technology

[0004] At present, the high refractive index material used in the mid-wave infrared band is mainly germanium, whose refractive index is 4.0, and the material with the highest refractive index known to be used is lead telluride, whose refractive index is as high as 5.6, but its light transmission ranges from 3.8 um, cannot be used in the mid-wave infrared band

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