Fig. 1. Composition block diagram of a dual-optical path spectrophotometer

Fig. 2. Overall system optical path layout

Fig. 3. Schematic diagram of the optical path structure of C-T type spectroscopic system

Fig. 4. Plot of the focal length of the collimating mirror f₁ versus the spectral resolution δ_λ

Fig. 5. Simulation of the initial structure of the spectroscopic system before optimization

Fig. 6. Simulation of the optical path of the spectroscopic system after optimization

Fig. 7. Spot diagram with 0.1 nm spacing at different wavelengths. (a) 300 nm; (b) 475 nm; (c) 500 nm; (d) 650 nm; (e) 825 nm; (f) 1000 nm

Fig. 8. Minimum resolution for different wavelengths

Fig. 9. Overall system optical path simulation diagram

Fig. 10. Resolution verification experiment

Fig. 11. Spectrograms of 546.1, 577.0, 579.0 nm wavelengths

Fig. 12. Peak and half-peak accounted for the pixel number at 546.1, 577.0, 579.0 nm wavelengths. (a) (b) 546.1 nm; (c) (d) 577.0 nm; (e) (f) 579.0 nm