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A Broad Spectrum Low Polarization Sensitivity Dichroic from UV to SWIR

A technology of short-wave infrared and dichroic film, which is applied in the direction of optical filters, optics, optical components, etc., to achieve high reflectivity and low polarization sensitivity, wide reflection spectral bandwidth, and avoid absorption

Active Publication Date: 2019-07-23
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

No broad-spectrum, low-polarization-sensitivity color separations are currently available that meet this spectral requirement

Method used

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  • A Broad Spectrum Low Polarization Sensitivity Dichroic from UV to SWIR
  • A Broad Spectrum Low Polarization Sensitivity Dichroic from UV to SWIR
  • A Broad Spectrum Low Polarization Sensitivity Dichroic from UV to SWIR

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Embodiment Construction

[0036] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] The concrete technical index requirement of the embodiment of the present invention is:

[0038]

[0039] The base material is quartz, and the working angle of the color separation film is 32°.

[0040] According to technical requirements, using quartz materials as substrates, it is necessary to reflect ultraviolet, visible, and near-infrared bands and transmit short-wave infrared bands, and requires low polarization sensitivity in both reflection bands and transmission bands. In the design of the film system, it is first necessary to consider the wide reflection bandwidth, so multiple stacks of reflective films with different central wavelengths are required to be superimposed on each other. Secondly, considering the refractive index matching between the substrate and the film layer, a matching layer is added between th...

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Abstract

The invention discloses a low-polarization sensitivity color separation sheet with a wide spectrum from ultraviolet to short wave infrared. The color separation sheet uses quartz as a substrate, a film system uses Nb2O5 and Ta2O5 as high-refractivity materials and uses SiO2 as a low-refractivity material. One surface of the quartz substrate is sequentially added with a long-wave pass reflective film I, a reflective film II, a reflective film III and a reflective film IV whose central wavelengths are gradually reduced from near infrared to ultraviolet; a matching layer I is inserted between the reflective film I and the substrate; a matching layer II is added between the reflective film IV and the air; the thicknesses of all high-refractivity film layers are kept unchanged, and the low-refractivity film layer thickness serves as a unique optimization parameter to optimize the initial film system to thus acquire a final color separation film system. The color separation sheet has a wide spectrum coverage range, the polarization sensitivity is low, a near infrared spectrum with a similar band can be effectively separated, and the low-polarization sensitivity color separation sheet with a wide spectrum from ultraviolet to short wave infrared can be used for color separation by a multi-spectrum low-polarization sensitivity space and ocean remote sensing instrument.

Description

technical field [0001] The invention relates to an optical film color separation sheet, in particular to a quartz substrate-based color separation sheet with wide spectrum and low polarization sensitivity from ultraviolet to short-wave infrared. Background technique [0002] As an important spectroscopic device in the optical system, the color separation plate is widely used in multi-spectrum and wide-spectrum aerospace remote sensing imaging instruments and communication systems. Since dichroic filters are usually used under oblique conditions, the polarization spectrum separation of light will be brought about. For the ocean remote sensing optical system, if there is a change in the polarization state of the incident light, the photoelectric signal received by the system will change, resulting in errors in detection values ​​and data retrieval. Therefore, the ocean remote sensing payload proposes low polarization sensitivity control for the system and optical components. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/20G02B1/11G02B5/26G02B5/22
CPCG02B1/11G02B5/208G02B5/22G02B5/26
Inventor 马小凤于天燕刘定权蒋林成效春蔡渊
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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