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All-dielectric film color separation element for visible light, laser and middle-infrared wavebands and design method

A technology of infrared band and design method, which is applied in the field of all-dielectric thin film color separation components and design, can solve the problems of limited metal-induced transmission bandwidth, inability to cover the band by transmission band, and spectral sensitivity of metal layers.

Active Publication Date: 2017-10-24
TIANJIN JINHANG INST OF TECH PHYSICS
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Problems solved by technology

The dichroic filter based on the medium-metal-dielectric film structure has a simple film structure and is easy to prepare, but the extremely thin metal layer is more sensitive to the spectrum. Film system optimization design and process integration are the key to the success of spectroscopic film
However, due to the limited bandwidth of metal-induced transmission, the transmission band cannot cover a wide band

Method used

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  • All-dielectric film color separation element for visible light, laser and middle-infrared wavebands and design method
  • All-dielectric film color separation element for visible light, laser and middle-infrared wavebands and design method
  • All-dielectric film color separation element for visible light, laser and middle-infrared wavebands and design method

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Embodiment Construction

[0043] In order to make the purpose, content and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0044] This embodiment proposes an all-dielectric film color separation element and design method for visible light, laser and mid-infrared bands. The design method includes the following steps:

[0045] (1) The dichroic element includes a first surface A and a second surface B parallel to each other, and the structure is as follows figure 1 shown. The first surface A has an optical multilayer film that reflects visible light and laser wavelengths and transmits mid-infrared wavelengths, and the second surface B has an anti-reflection film that transmits mid-infrared wavelengths.

[0046] (2) Selected reference wavelength λ 0 is 0.9μm, and the unit optical thickness is λ 0 / 4; select the substrate Sub material as Si,...

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Abstract

The invention belongs to the technical field of optical films, and specifically relates to an all-dielectric film color separation element reflected in a visible light waveband (0.6-0.9 [mu]m) and a laser waveband (1.06 [mu]m) and transmitted in a middle-infrared waveband (3.0-5.0 [mu]m) and a design method. According to the color separation element and the design method, light splitting is performed according to the methods of visible light and laser reflection and infrared transmission, a silicon material substrate is designed by employing an all-dielectric film material, which is different from a conventional dielectric-metal-dielectric film structure, the average light-splitting efficiency of the visible light and laser wavebands reaches more than 98%, and the average light-splitting efficiency of the middle-infrared waveband reaches more than 97%.

Description

technical field [0001] The invention belongs to the technical field of optical thin films, in particular to the spectroscopic technology for three bands, and specifically relates to a visible light band (0.6-0.9 μm) and laser band (1.06 μm) reflection and mid-infrared band (3.0-5.0 μm) transmission All-dielectric film color separation element and design method. Background technique [0002] The modern photoelectric tracking and aiming pod has the functions of capturing, tracking and aiming. system components. The optical pod integrates infrared imaging, TV tracking and laser ranging functions. Its optical system basically adopts a common-aperture light combination and light splitting system. At present, foreign advanced pods all adopt the scheme of "three lights" such as visible light, laser and infrared sharing the front-end optical system, and then perform information processing on each optical path separately. Therefore, the light-splitting element for the above three ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20G02B1/113G02B27/00
CPCG02B1/113G02B5/201G02B5/207G02B5/208G02B27/0012
Inventor 刘华松姜玉刚李士达杨霄冷健孙鹏季一勤
Owner TIANJIN JINHANG INST OF TECH PHYSICS
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