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An electrically tunable optical filters insensitive to polarization state of incident light

A polarization state and optical filter technology, applied in the field of optics, can solve the problems of restricting the application of electrically tunable optical filters, the full-height half-width of the transmission spectrum, and the thickness of the liquid crystal cell, etc., to achieve a large adjustment range of the transmission wavelength and a short response time , half-height full-width small effect

Pending Publication Date: 2020-06-02
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, traditional liquid crystal-based electrically tunable filters often only have a filtering effect on the incident extraordinary light, but are powerless on the ordinary light component. The index of refraction changes, while that for ordinary light remains the same
The sensitivity of the traditional electrically tunable optical filter to the polarization state of the incident light restricts the application of the electrically tunable optical filter
In addition, traditional liquid crystal-based electrically tunable filters (such as Lyot or Solc type filters) also have defects such as large full-height half-width of the transmission spectrum, large thickness of the liquid crystal cell, and long response time.

Method used

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  • An electrically tunable optical filters insensitive to polarization state of incident light
  • An electrically tunable optical filters insensitive to polarization state of incident light

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Embodiment

[0023] Such as figure 1 As shown, an electrically tunable optical filter insensitive to the polarization state of incident light includes a first Fabry-Perot interference cavity 1 and a second Fabry-Perot interference cavity 2 . The incident light enters the first Fabry-Perot interference cavity 1 to be filtered for the first time, and then enters the second Fabry-Perot interference cavity 2 to be filtered for the second time.

[0024] Both the first Fabry-Perot interference cavity 1 and the second Fabry-Perot interference cavity 2 are liquid crystal cells that can be driven by a power supply.

[0025] The first Fabry-Perot interference cavity 1 includes two glass substrates (3-1, 3-2) separated by a certain distance, defining two opposing glass substrates (3-1, 3-2). The surface is the inner surface of two glass substrates, the inner surfaces of the two glass substrates are parallel to each other, the light incident direction is perpendicular to the inner surfaces of the two...

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Abstract

The invention discloses an electrically tunable optical filter insensitive to the polarization state of incident light, which comprises a first Fabry-Perot interference cavity and a second Fabry-Perotinterference cavity which have the same principle and basic structure and are liquid crystal boxes driven by a power supply, wherein the first Fabry-Perot interference cavity comprises two spaced glass substrates, the two opposite surfaces of the two glass substrates are inner surfaces and are parallel to each other, the incident direction of light rays is perpendicular to the inner surfaces, andthe inner surfaces are sequentially plated with transparent electrodes, broadband high-reflectivity dielectric films and liquid crystal orientation films; the transparent electrodes on the glass substrates are respectively connected with two poles of an alternating-current voltage source through wires, first nematic phase liquid crystals with positive dielectric anisotropy are filled between theglass substrates, and the orientation direction of the first nematic phase liquid crystals is parallel to the inner surfaces of the two glass substrates. The invention has the advantages of large freespectrum range, small transmission spectrum full width at half maximum, large transmission wavelength adjustment range, small liquid crystal box thickness, short response time, simple structure and high reliability.

Description

technical field [0001] The invention belongs to the field of optical technology, and in particular relates to an electrically adjustable optical filter insensitive to the polarization state of incident light. Background technique [0002] Electrically tunable optical filter is an important optical component, which is widely used in optical remote sensing, hyperspectral imaging, medical imaging, etc. Materials such as liquid crystals and electro-optic crystals are often used to make electrically tunable optical filters. By using the electro-optic effect of these materials, the characteristics of optical filters can be adjusted electrically. Due to the large birefringence of liquid crystal materials, it has special advantages to use them to make electrically tunable optical filters, such as a large adjustment range can be achieved. [0003] However, traditional liquid crystal-based electrically tunable filters often only have a filtering effect on the incident extraordinary l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G02F1/137G02F1/139G02F1/21
CPCG02F1/13306G02F1/137G02F1/139G02F1/21G02F1/213
Inventor 何赛灵王楠
Owner ZHEJIANG UNIV
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