Third level Fabry-Perot cavity type tunable ray filter system

A Perot cavity and optical filter technology, applied in the field of spectral imaging, can solve the problems of low free spectral region and tuning capability, non-continuous filtering, complex system structure, etc. high rate effect

Inactive Publication Date: 2009-09-16
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

[0006] Lyot-type and Solc-type tunable filters usually require multi-stage stacking to have a better filtering effect. The higher the spectral resolution requirement, the more stacking stages are required, which leads to complex system structure, larger volume, Contradictions such as lower transmittance; Fabry-Perot cavity is currently mainly used in optical c

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  • Third level Fabry-Perot cavity type tunable ray filter system
  • Third level Fabry-Perot cavity type tunable ray filter system
  • Third level Fabry-Perot cavity type tunable ray filter system

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Embodiment Construction

[0028] As shown in Figure 1, the first Fabry-Perot cavity 1, the second Fabry-Perot cavity 2 and the third Fabry-Perot cavity in the three-stage Fabry-Perot cavity tunable filter system The R-Perot cavities 3 are stacked in any order. The first Fabry-Perot cavity 1, the second Fabry-Perot cavity 2 and the third Fabry-Perot cavity 3 have the same structure. The Brie-Perot cavity includes a first glass substrate 11, a first ITO conductive film 12, a first medium high reflection layer 13 and a first cavity 14, and the first cavity 14 is respectively provided with a first medium high reflection Layer 13, the first ITO conductive film 12 and the first glass substrate 11. The cavity lengths of the first Fabry-Perot cavity 1 and the second Fabry-Perot cavity 2 are the same.

[0029] As shown in Figure 2, the three-stage Fabry-Perot cavity tunable filter system includes a polarizer 4, a fourth Fabry-Perot cavity 5, a fifth Fabry-Perot cavity 6, The sixth Fabry-Perot cavity 7 and the...

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Abstract

The invention discloses a third level Fabry-Perot cavity type tunable ray filter system, comprising two structures. The first structure comprises three Fabry-Perot cavities, wherein, the Fabry-Perot cavities are electrically tunable; the second structure comprises a polarizer, the three Fabry-Perot cavities and an analyzer, wherein, the Fabry-Perot cavities have the tunable effect only on the linearly polarized light which goes through the polarizer. The invention realizes continuously adjustable narrowband light-filtering within the wide spectral range by the reasonable design of the three Fabry-Perot cavities, the Fabry-Perot cavities have mature fabrication process, and the implementation of the whole system is convenient. The invention further has the characteristics of large aperture, simple assembling, wide light-filtering spectrum range and high spectral resolution, and can be applied in the fields of remote sensing, biomedicine, astronomical observation and the like.

Description

technical field [0001] The invention relates to an optical tunable filter device, in particular to a three-stage Fabry-Perot cavity tunable filter system, which can be applied to the field of spectral imaging. Background technique [0002] Tunable filter systems include mechanical tuning, acousto-optic tuning, electro-optic tuning filter systems, etc. [0003] Mechanically tunable filters are mainly used in interference filter systems and polarization interference filter systems. By changing the physical parameters of the devices in the system, such as thickness, angle, etc., the purpose of tuning the spectral characteristics of the filter system is achieved. The mechanical tuning filter system generally has a moving mechanism, poor stability and firmness, slow tuning response speed, and complex structure. [0004] The acousto-optic tunable filter is mainly a tunable filter system made by using the abnormal Bragg diffraction effect of anisotropic crystals under the acousto-...

Claims

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Application Information

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IPC IPC(8): G02F1/01G02F1/061G02F1/13
Inventor 杨国伟李海峰刘旭
Owner ZHEJIANG UNIV
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