Programmable optical filter capable of realizing any spectrum transmittance

A technology of spectral transmittance and optical filter, applied in the optical field, can solve the problems of slow switching rate, slow filter switching rate, inability to realize transmittance filtering, etc., and achieve the effect of fast switching speed and simple operation.

Inactive Publication Date: 2017-09-08
NORTHEASTERN UNIV
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Problems solved by technology

[0006] (1) The filter switching rate is slow: most of the existing filter switching systems are mechanically controlled to switch filters, and the switching rate is slow
[0007] (2) The spectral transmittance of the filter is fixed: the existing filter swi

Method used

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  • Programmable optical filter capable of realizing any spectrum transmittance

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[0015] Example 1

[0016] The optical path design diagram of the present invention is as follows figure 1 As shown, the programmable filter that can realize any spectral transmittance is mainly composed of grating A2, grating B5, lens 3, and digital micromirror device or spatial light modulator 4. Wherein, the grating A and the grating B are arranged side by side on the focal plane of one side of the lens 3, and the distance from the lens 3 is the focal length of the lens 3; the digital micromirror device or the spatial light modulator is arranged on the other side of the focal plane of the lens 3. , The distance from lens 3 is the focal length of the lens. After the white beam of incident light 1 is split by grating A and passed through lens 3, the light from the same wavelength is condensed to the same micro lens of the digital micro mirror device or the same pixel of the spatial light modulator, and the digital micro mirror is controlled by the controller Each pixel point on...

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Abstract

The invention belongs to the optical field and discloses a programmable optical filter capable of realizing any spectrum transmittance. The optical filter comprises an incident module, a control module and an outgoing module. The control module comprises a digital micro-mirror device or a space light modulator, and its combination with a grating is equal to realize an optical filter for any spectrum transmittance. The digital micro-mirror device can control the angles of various micro mirrors at different positions, and its binary system mode speed can be as high as 32kHz. The space light modulator can control the reflection rates of different pixels, and its frame frequency can be 180Hz at most. Therefore, with the programmable optical filter of the invention, following functions can be realized: 1) fast optical spectrum transmittance switching; 2) any spectrum transmittance realizing; and 3) optical snapshot function. With the programmable optical filter, it is possible to realize an optical filter of any spectrum transmittance, and the switching speed is fast and the operation process is simple. Through the programmable manner, the optical spectrum transmittance and optical radiation amount can be controlled.

Description

technical field [0001] The invention belongs to the field of optics and relates to a programmable optical filter capable of realizing arbitrary spectral transmittance. Background technique [0002] Existing filter switching systems mainly include filter wheels and tunable filters. [0003] The filter wheel mainly controls the switching of different filters mechanically to achieve different spectral transmittances. The disadvantage is that the number of filters is limited, and the spectral transmittance is fixed once the filter is installed, and commercial filters cannot achieve arbitrary spectral transmittance. [0004] Tunable filters are mainly divided into two types, liquid crystal tunable filter (LCTF) and acousto-optic tunable filter (AOTF). At present, due to the high production cost of tunable optical filter crystals, the price of tunable optical filters is generally high; in addition, although its spectral transmittance can be adjusted, it cannot achieve arbitrary ...

Claims

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Application Information

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IPC IPC(8): G02B26/08G02B27/42
CPCG02B26/0833G02B27/4244
Inventor 陈硕吴佳豪丛婧
Owner NORTHEASTERN UNIV
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