使用全像波導之快照式高光譜技術

Hyperspectral technology is a technology to obtain 3D spectrum cube. It can obtain richer and more accurate information than a color photo. Among them, the snapshot hyperspectral technology does not require scanning to obtain hyperspectral information, it has the advantages of real-time shooting, high durability, low maintenance costs, and low mechanical complexity. Although it trades spatial resolution with the spectral resolution, it still keeps sufficient spatial resolution, because of the advances of CMOS sensor technique. In recent years, we have developed a snapshot hyperspectral technology. Two imaging systems are set up in the optical path to generate intermediate images, and the holes-array screen is used for sparse sampling to avoid the overlap of hyperspectral images. Later, we developed the encoding aperture technology. It can increase the amount of light entering the system. However, the large system size makes it difficult to promote. In this project, we combine the holographic light guide and the hyperspectrometer, to improve the system performance and reduce the volume. We will also use the spatial selectivity of the volume holographic optical element to replace the sparse sampling function of thescreen. It thus avoids the use of the optical imaging system to reduce the system volume. In the first year of the project, a theoretical model will be established. And we will increase the spectral bandwidth of holographic optical components with the degeneracy of wavelength tolerance and angle tolerance. In the second year, the reflective lens-type holographic optical element is developed to eliminate focusing dispersion. In the third year, a volume holographic optical element with the sparse sampling technology will be developed to replace thesparse sampling function of the screen. The lightweight snapshot hyperspectrometer with holographic optical light guide will be gradually developed. Since no imaging lens is used, and spectral resolution is not sacrificed, it will be more competitive than the existing snapshot hyperspectral technology.