Fig. 1. Schematic of the Yb∶YAG thin-disk regenerative amplifier

Fig. 2. Theoretical calculation of spot size of fundamental mode in regenerative amplifier cavity

Fig. 3. Results of numerical solution of the theoretical model. (a) Curve of the upper state population density N varying with time; (b) curve of the pulse energy in the cavity varying with time

Fig. 4. Experimental results. (a) Pulse amplification process in the regenerative amplifier cavity measured by experiment; (b) output pulse measured by experiment

Fig. 5. Experimental results. (a) Output power with different round-trips obtained by experimental measurement and theoretical calculation; (b) theoretically calculated output power of different losses with different round-trips

Fig. 6. Experimental results. (a) Continuous output power at different pump powers; (b) beam quality of the output laser

Fig. 7. Spectrum of seed light and amplified light

Fig. 8. Experimental results. (a) Autocorrelation curve of seed light; (b) autocorrelation curve of amplified light

Fig. 9. Schematic of the regenerative amplifier based on double thin-disk modules

Fig. 10. Output power of regenerative amplifier based on double thin-disk modules