Fig. 1. Computational model for siloxane solution refractive index matched liquid-cooled Nd∶YLF thin-disk lasers. (a) Laser structure; (b) simulation model; (c) ideal thermal loading conditions; (d) unideal thermal loading conditions

Fig. 2. Temperature distribution on the interface under ideal thermal loading conditions

Fig. 3. Temperature distribution on the interface under unideal thermal loading conditions

Fig. 4. Effect of flow rate on the cooling of flakes. (a) Variation of the maximum temperature rise at the solid-liquid interface with flow rate; (b) pressure distribution at a flow rate of 5 m/s

Fig. 5. Temperature distribution of fluid and thin-disk in the XZ plane. (a) Ideal thermal loading conditions; (b) unideal thermal loading conditions

Fig. 6. Thin-disk clamping method. (a) Welding fixation at both ends; (b) slot fixation

Fig. 7. Welding fixation at both ends under unideal thermal loading condition. (a) Thermal stress; (b) thermal deformation; (c) thermal deformation in laser flux direction (Z-axis)

Fig. 8. Slot fixation under unideal loading condition. (a) Thermal stress; (b) thermal deformation; (c) thermal deformation in laser flux direction (Z-axis)

Fig. 9. Thermal safety analysis. (a) Temperature; (b) stress

Fig. 10. Comparison between thermal deformation OPD and thermal optical effect OPD

Fig. 11. OPD variation along the fluid flow direction (X-axis) and perpendicular to the fluid flow direction (Y-axis) in the laser aperture under ideal thermal loading conditions

Fig. 12. OPD variation along the fluid flow direction (X-axis) and perpendicular to the fluid flow direction (Y-axis) in the laser aperture under unideal thermal loading conditions

Fig. 13. Comparison of calculated and experimental values of wavefront distortion of gain module. (a) Experimental value;(b) calculated value

Fig. 14. Experimental measurements of the Legendre polynomial expansion