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A wide-spectrum dichroic film with visible near-infrared transmission and medium-long-wave infrared reflection

A long-wave infrared and near-infrared technology, which is applied in the field of wide-spectrum dichroic films, can solve the problems of high steepness in the spectral transition region and high reflectivity of mid- and long-wave infrared, and achieve the effects of high reflectivity, easy preparation and good process repeatability.

Active Publication Date: 2019-01-25
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

[0004] The purpose of the present invention is to provide a wide-spectrum color separation film, which can transmit visible light near-infrared bands and reflect mid- and long-wave infrared bands, solve the problem of wide-spectrum color separation films for space remote sensing. The technical problem that the steepness of the transition zone and other indicators cannot be realized at the same time

Method used

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  • A wide-spectrum dichroic film with visible near-infrared transmission and medium-long-wave infrared reflection
  • A wide-spectrum dichroic film with visible near-infrared transmission and medium-long-wave infrared reflection
  • A wide-spectrum dichroic film with visible near-infrared transmission and medium-long-wave infrared reflection

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Embodiment 1

[0028] Embodiment 1: the specific technical index requirement of the present embodiment is:

[0029] Dichroic film working angle is 45°, transmission band: 0.45~1.6μm, T≥75%; reflection zone band: 2.3~4μm, R≥70%; 4~8μm, R≥82%, 8~14μm, R ≥90%.

[0030] According to technical requirements, JGS-1 quartz glass is used as the substrate, and tantalum oxide (Ta 2 o 5 ) and silicon dioxide (SiO 2 ) are respectively used as high-refractive-index materials and low-refractive-index materials for matching film layers; zinc sulfide (ZnS) and silver (Ag) are respectively used as dielectric materials and metal materials for induced transmission film layers. When the color separation film adopts a single induced transmission film layer, that is, the film system is Glass / 60nm ZnS / 6nm Ag / 60nm ZnS / Air, by figure 2 The transmittance curve of curve a and image 3 From the reflectance curve of the middle curve a, it can be seen that none of the spectral performance can meet the technical spec...

Embodiment 2

[0038] Embodiment 2: the specific technical index requirement of the present embodiment is:

[0039]Dichroic film working angle is 45°, transmission band: 0.50~1.70μm, T≥75%; reflection zone band: 2.6~4μm, R≥70%; 4~8μm, R≥80%; 8~14μm, R ≥90%.

[0040] According to technical requirements, JGS-1 quartz glass is used as the substrate, and tantalum oxide (Ta 2 o 5 ) and silicon dioxide (SiO 2 ) are respectively used as high-refractive-index materials and low-refractive-index materials for matching film layers; zinc sulfide (ZnS) and silver (Ag) are respectively used as dielectric materials and metal materials for induced transmission film layers. When the color separation film adopts a single induced transmission film layer, that is, the film system is Glass / 80nm ZnS / 6nm Ag / 80nm ZnS / Air, by Figure 4 The transmittance curve of curve a and Figure 5 From the reflectance curve of the middle curve a, it can be seen that none of the spectral performance can meet the technical spe...

Embodiment 3

[0048] Embodiment 3: the specific technical index requirement of the present embodiment is:

[0049] Dichroic film working angle is 45°, transmission band: 0.35~1.6μm, T≥75%; reflection zone band: 2.4~4μm, R≥70%; 4~8μm, R≥80%; 8~14μm, R ≥88%.

[0050] According to technical requirements, JGS-1 quartz glass is used as the substrate, and tantalum oxide (Ta 2 o 5 ) and silicon dioxide (SiO 2 ) are respectively used as high-refractive-index materials and low-refractive-index materials for matching film layers; zinc sulfide (ZnS) and silver (Ag) are respectively used as dielectric materials and metal materials for induced transmission film layers. When the color separation film adopts a single induced transmission film layer, that is, the film system is Glass / 45nm ZnS / 5nm Ag / 45nm ZnS / Air, by Figure 6 The transmittance curve of curve a and Figure 7 From the reflectance curve of the middle curve a, it can be seen that none of the spectral performance can meet the technical spe...

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Abstract

The invention discloses a broadband spectrum color separation film with infrared reflection of middle and long waves of near-infrared transmission of a visible light. The color separation film consists of an optical base slice, and a matching film layer and an inductive transmission film layer which are orderly plated at one side of the base slice. Through adding the matching film layer between the base slice and the inductive transmission film layer, the width of a transmission band of the color separation film is widened and the gradient of a spectrum transmission zone is improved. The matching film layer is a multi-layered irregular medium film structure; the inductive transmission film layer is a combining structure of adding a metal film between two medium films. The color separation film has the width of the pass band of the near-infrared band of the visible light, the reflection rate of the infrared band of middle and long waves is high, and the gradient of the spectrum transmission zone is big, and so on.

Description

technical field [0001] The present invention relates to optical thin film technology. Specifically, it refers to a wide-spectrum color separation film that transmits visible light near-infrared bands and reflects mid- and long-wave infrared bands. technical background [0002] Broad-spectrum dichroic film is an optical device that can separate visible near-infrared and mid-to-far infrared spectral energy. It has important applications in the field of aerospace remote sensing. In order to obtain rich remote sensing information, many space optical remote sensing instruments adopt multi-spectral channels. More, a trend towards a denser spectrum. In order to assign different spectra to different optical paths and detection focal planes, it is necessary to develop a (ultra) wide-spectrum color separation plate, which requires that the spectrum of the color separation plate covers all spectral channels, the optical energy of reflection or transmission is high, and the reflection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/20
CPCG02B5/201G02B5/204G02B5/208
Inventor 刘保剑李大琪段微波余德明蒋林刘定权
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI