Fig. 1. Schematic diagram of principle of snapshot spectral imaging system based on diffractive rotation

Fig. 2. Flow chart of reconstruction algorithm

Fig. 3. PSFs corresponding to DOEs with different design parameters simulated at 460 nm

Fig. 4. Schematic diagram of imaging model of refractive-diffractive hybrid optical system

Fig. 5. Schematic diagrams of traditional diffractive rotation imaging system and refractive-diffraction hybrid optical system, and PSFs at 460, 500, and 550 nm. (a) Schematic diagram of refractive-diffraction hybrid optical system; (b) PSFs of refractive-diffraction hybrid optical system simulated at 460, 500, and 550 nm; (c) schematic diagram of traditional diffractive rotation imaging system; (d) PSFs of traditional diffractive rotation imaging system simulated at 460, 500, and 550 nm

Fig. 6. Schematic diagram of diffractive rotation imaging system for long-distance detection application scenarios

Fig. 7. Schematic diagram of telephoto optical system in front and wavefront and PSF of this system. (a) Design results of optical system in front; (b) wavefront of optical system in front at incident light angle of 1.56° and wavelength of 546.1 nm; (c1)-(c5) PSFs without aberration; (d1)-(d5) PSFs with aberration of optical system in front

Fig. 8. Experimental system diagram. (a) Hyperspectral camera based on diffractive rotation; (b) refractive diffractive hybrid lens;(c) PSF calibration system

Fig. 9. PSFs measured by calibration

Fig. 10. Simulation reconstruction results. (a) Generated blurred image with diffractive rotation; (b) full-spectrum visualization image of reconstructed spectral data; (c) full-spectrum visualization image of standard dataset; (d) image corresponding to each spectral channel

Fig. 11. Spectral curves of reconstructed results

Fig. 12. Reconstruction results of captured images. (a) Captured blurred image with diffractive rotation; (b) RGB visualization image of reconstructed hyperspectral image; (c) single channel spectral image; (d) spectral curves of selected patches

Fig. 13. Comparison of PSFs at different imaging distances and infinity