Programmable optical filter capable of realizing any spectrum transmittance

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 ...

AI Technical Summary

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 switch mainly switches the filters with different transmittance mechanically to realize the selection of filters with different spectral transmittances. The light transmittance is fixed, so it is impossible to achieve arbitrary light transmittance filtering

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