Narrowband double-filtering hyperspectral imaging based on a single AOTF

A method of spectral resolution improvement was presented based on the double filtering in a single AOTF. A special narrowband hyperspectral imaging system using this single-AOTF double-filtering method was established. The spectral bandwidth of double-filtered spectra was 39% narrower than that of the single-filtered optical signal experimentally. We achieved hyperspectral images of the resolution target with better image resolutions than the single-filtering images because of the improved spectral resolution after the double-filtering process.