Fig. 1. Schematic diagram of the grism splitting

Fig. 2. Analysis result of the ZnS prism. (a) Δy under different α; (b) change curve of R_MS with α

Fig. 3. Schematic diagram of the objective optical path

Fig. 4. Aberration analysis of the objective lens. (a) Change curve of D with α; (b) change curve of C with α

Fig. 5. Objective lens analysis result when α=32.5° (before aberration compensation). (a) Change curve of y with k; (b) position interval Δy between adjacent wavenumbers

Fig. 6. Optical path diagram of the spectrometer

Fig. 7. Objective lens analysis result when α=32.5° (after aberration compensation). (a) Change curve of y with k; (b) position interval Δy between adjacent wavenumbers

Fig. 8. Aberration analysis of the objective lens. (a) Vertical axis chromatic aberration; (b) relative distortion

Fig. 9. Point diagram of typical wavelength. (a) 750 nm; (b) 792 nm; (c) 838 nm; (d) 891 nm; (e) 950 nm

Fig. 10. Concentration of the diffracted energy. (a) 750 nm; (b) 838 nm; (c) 950 nm

Fig. 11. Change curve of λ_FWHM with wavelength

Fig. 12. Spectral curve. (a) Spectral curve of the light source; (b) radiation intensity received by the image plane

Fig. 13. Axial response curve. (a) Before aberration compensation; (b) after aberration compensation