Fig. 1. Schematic of Yb∶YAG surface gain slab laser amplifier

Fig. 2. Schematic of surface gain slab

Fig. 3. (a) Output power curves and (b) optical efficiency curves of single-pass amplifying

Fig. 4. (a) Output power curves and (b) optical efficiency curves of double-pass amplifying

Fig. 5. Transmission wavefront of Yb∶YAG surface gain slab. (a) Wavefront in x direction; (b) wavefront in y direction; (c) wavefront of two-dimension