Fig. 1. Optical structure diagram of Rowland circle

Fig. 2. Overall design of optical path of double Rowland circle

Fig. 3. Diagram of optical path from plane-convex mirror to incident slit

Fig. 4. Structure simulation diagram and imaging plane spot diagram of Rowland circle in wavelength range of 500 nm~700 nm

Fig. 5. Structure simulation diagram and imaging plane spot diagram of Rowland circle in wavelength range of 200 nm~500 nm

Fig. 6. Effect of position of signal receiving device on aberration

Fig. 7. Signal acquisition device and its placement

Fig. 8. Spot diagram of 253.65 nm and 253.25 nm spectral lines with different slit widths

Fig. 9. Spot diagram of full-band characteristic and edge spectral lines of spectrometer