Fig. 1. Experimental setup of a high-power single-frequency continuous-wave Innoslab laser

Fig. 2. Schematic diagram of single-end-pumped configuration

Fig. 3. Simulations of heat distribution and thermal lensing effect of laser crystal. (a) Thermal distribution in laser crystal; (b) fitted thermal lensing data

Fig. 4. Crystal thermal stress distribution maps. (a) XX direction; (b) XY direction; (c) XZ direction; (d) YY direction; (e) YZ direction; (f) ZZ direction

Fig. 5. 4f imaging system based on Fourier transform

Fig. 6. Simulation results of 4f thermal lens spherical aberration self-reproduction imaging system based on Innoslab multi-pass amplifier. (a) Input seed beam profile; (b) simulation beam profile after amplification

Fig. 7. BeamXpert simulates change in spot size of optical path. (a) Spot distribution on left side of crystal; (b) spot distribution in center of crystal; (c) spot distribution on right side of crystal; (d) spot size data

Fig. 8. Amplifier output power versus seed optical power and number of amplification stages

Fig. 9. Beam quality of seed laser and output laser before and after amplification under a pump power of 25 W. (a) Beam quality of seed laser; (b) beam quality of output laser before and after amplification

Fig. 10. Power stability