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

An infrared filter and high refractive index technology, applied in the field of optical filters, can solve problems such as the inability to apply the mid-wave infrared band, and achieve the effect of increasing the refractive index ratio nH/nL and improving spectral performance

Inactive Publication Date: 2016-07-13
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0014] Using tellurium germanium lead as the high refractive index film material and silicon dioxide as the low refractive index film material to prepare a mid-wave infrared narrow-band filter with a center wavelength of 4um, the film system is designed as follows:

[0015] Sub|HLLHLHLLHL|Air

[0016] Such as figure 2 As shown, the bandwidth of the filter using tellurium-germanium-lead as the high-refractive index film material is only 160nm, while the same film system uses germanium as the high-refractive index film material. The bandwidth of the filter is 390nm.

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20G02B1/00
CPCG02B5/208G02B1/00
Inventor 谢平李斌
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI