Fig. 1. Solar pumped solid laser simulation structure

Fig. 2. Spectral transmittance of PMMA plate material with thickness of 5 mm

Fig. 3. The relationship between the size of the quartz tube, the input aperture of the metal conical cavity and the diameter of the Fresnel lens. (a) Quartz tube size fitting curve; (b) Metal conical cavity input aperture fitting curve

Fig. 4. Thermal load, temperature distribution and stress distribution of crystal rods. (a) Thermal simulation analysis of \begin{document}$ \phi 6 \times 35 $\end{document} mm crystal rods; (b) Thermal simulation analysis of \begin{document}$ \phi 6 \times 40 $\end{document} mm crystal rods; (c) Thermal simulation analysis of \begin{document}$ \phi 6 \times 45 $\end{document} mm crystal rods

Fig. 5. Fitting curve of crystal rod length to Fresnel lens diameter

Fig. 6. Theoretical output power fitting curve

Fig. 7. Fitting curves of theoretical output power for relative aperture of different Fresnel lenses