Fig. 1. Schematic of Czerny-Turner spectrometer structure

Fig. 2. Effects of initial incident angle at 500 nm on diffraction angle and off-axis angles of focusing mirror and collimating mirror.(a) diffraction angle at an edge wavelength of 200 nm; (b) diffraction angle at an edge wavelength of 1000 nm; (c) off-axis angle of collimating mirror; (d) off-axis angle of focusing mirror

Fig. 3. YRMS values for different initial incident angles. (a) Initial incident angle at a central wavelength of 500 nm; (b) initial incident angle at an edge wavelength of 1000 nm

Fig. 4. Initial structure diagram before optimization

Fig. 5. Optimized light path diagram

Table 1. Specification of the optical elements

Table 2. Initial structural parameters of the optical system