Fig. 1. The working principle of PGP imaging spectrometer

Fig. 2. Schematic image of the curved slit on the detector

Fig. 3. Schematic diagram of optical path in PGP combined dispersive element

Fig. 4. The smile when grating line is 280 lp/ mm

Fig. 5. The smile from 400~800 nm

Fig. 6. The slit image on the detector

Fig. 7. Schematic diagram of curved slit

Fig. 8. The smile of the circular slit from 400 nm to 800 nm

Fig. 9. Flow chart of the design of the eliminate smile imaging spectrometer

Fig. 10. Flow chart of genetic algorithm

Fig. 11. Smile of PGP spectrometers with the curved slit

Fig. 12. Optical path diagram of collimator lens

Fig. 13. Optical structure diagram of the focusing lens

Fig. 14. Schematic diagram of processed curved slits

Fig. 15. Optical structure diagram of the PGP spectrometer

Fig. 16. Smile of PGP spectrometer

Fig. 17. Keystone of PGP spectrometer

Fig. 18. Spot diagrams

Fig. 19. RMS spot radius versus wavelength

Fig. 20. Energy concentration diagram

Fig. 21. The modulation transfer function of multiple wavelengths

Fig. 22. The correspondence between straight slit and curved spectral lines

Fig. 23. The correspondence between curved slit and straight spectral lines

Fig. 24. The push process of curved slit

Fig. 25. Quadratic element measuring instrument

Fig. 26. Slit measurement results