A Volume Holographic Grating Tunable Filter

Abstract

The present invention discloses a volume holographic grating tunable filter which comprises a dielectric cavity and two identical volume holographic gratings. The dielectric cavity has a set of parallel outer surfaces. The two volume holographic gratings are located on the parallel outer surfaces of the dielectric cavity, and the installation directions are opposite. The dielectric cavity is vacuumed or is filled with other optical media. Compared with the prior art, the optical path structure is simple, the spectra transmittance rate is high, a secondary body grating lateral dimension requirement is low, the processing difficulty of the volume holographic grating is reduced, a spectral imaging system is easily built, the size is small, the weight is small, the portability is strong, and the filter is suitable for a variety of spectroscopic imaging system optical paths.

Description

technical field [0001] The invention relates to the technical field of spectral imaging, in particular to a volume holographic grating tunable filter. Background technique [0002] Spectral imaging technology can obtain the spectral information and spatial information of the target at the same time, which is of great significance for effectively increasing the amount of information in optical detection and completing the feature recognition of targets in complex backgrounds. There are broad application prospects in many fields such as monitoring and natural disaster forecasting. [0003] The spectral imaging technology based on the volume holographic grating tunable filter can realize the target area array spectral imaging and panchromatic imaging at the same time, and has the advantages of high spectral transmittance, wide spectral tuning range, high resolution, less stray light, small imaging distortion, It has a series of advantages such as simple structure and channel r...

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Problems solved by technology

[0004] However, for spectral imaging under the condition of wide-spectrum non-collimated light, ordinary volume holographic gratings will produce serious color blur, and the method of using corner cube prisms and other optical path reentrant devices to make the optical path return to the original path for correction will cause serious damage to the light energy. Great loss, and the requirement for the lateral size of the grating is relatively large, which makes it difficult to make volume holographic gratings

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