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Infrared Bandpass Filters with High Rectangularity Transmission Curves

A technology of transmittance curve and band-pass filter, applied in the direction of filter, etc., can solve the problems of low refractive index and poor waveform squareness, to meet performance requirements, good waveform squareness, and improve resolution. Effect

Inactive Publication Date: 2011-12-07
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] At present, germanium and zinc sulfide are commonly used as coating materials in foreign countries. The refractive index of the two materials is relatively low. Bandwidth ratio at overrate), waveform squareness difference

Method used

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  • Infrared Bandpass Filters with High Rectangularity Transmission Curves
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  • Infrared Bandpass Filters with High Rectangularity Transmission Curves

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Embodiment Construction

[0018] The concrete implementation method of the present invention will be further described below in conjunction with accompanying drawing:

[0019] Since the main film system of the optical filter of this patent adopts a multi-resonant cavity structure, and the order of the intermediate resonant cavity is relatively high, the band-pass rectangularity and the ability to limit the band of the optical filter are improved. The lead telluride material is selected as the high refractive index layer of the film system, and the sub-peaks smaller than 4.0 microns are cut off by using its intrinsic absorption characteristics, and the cut-off depth is increased. The front film layer and the back film layer are respectively realized by vacuum coating, and zinc selenide and lead telluride film materials are alternately vapor-deposited on the two surfaces of the substrate (attached figure 1 ).

[0020] In order to effectively improve the spectral resolution of the target infrared radiati...

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Abstract

The invention discloses an infrared bandpass filter with a high squareness transmittance curve. The filter uses germanium as a base, zinc selenide and lead telluride as film materials, and is prepared by a vacuum thin film deposition method. The main film system adopts five resonant cavity precision film structure. It consists of a front film system, a substrate and a back film system. It has good band-pass transmission performance and can suppress optical radiation interference in other bands. It is applied to a space infrared scanning radiation instrument to meet the detection requirements for the infrared radiation of atmospheric targets.

Description

technical field [0001] The invention relates to an infrared band-pass filter, in particular to an infrared band-pass filter with a high rectangularity transmittance curve, which is used as a 10.8 micron infrared radiation amount in optical remote sensing under space environment conditions The detection filter, which can also work on the ground, meets the detection requirements for the infrared radiation of atmospheric targets. technical background [0002] In order to meet the needs of the development of space infrared technology, various new detection devices have developed rapidly, among which the development of array detection elements is particularly rapid, which puts forward high-resolution requirements for the corresponding optical spectroscopic system. Therefore, the development of 10.8-micron high-rectangularity infrared band-pass filter has been put on the agenda and has attracted much attention. The infrared filter with a central wavelength of 10.8 microns is used...

Claims

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Application Information

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IPC IPC(8): G02B5/20
Inventor 张麟刘定权李斌倪榕黄春
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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