Fig. 1. Preferred geometries of main amplifier in high energy rep-rated nanosecond DPSSL. (a) Multi-slab; (b) active mirror; (c) zigzag slab

Fig. 2. Mercury multi-slab design with room temperature high speed gas cooling^[43]. (a) Schematic; (b) photo

Fig. 3. Thermally induced wavefront aberration of single gain module in Mercury main amplifier^[43]. (a) Simulated result; (b) experimental result

Fig. 4. Gain module of DiPOLE main amplifier^[47]. (a) Large-aperture Yb∶YAG/Cr∶YAG ceramic; (b) multi-slab amplifier head with cryogenic gas cooling

Fig. 5. Output thermal depolarization patterns corresponding to different input polarization states. (a) Experimental results; (b) simulation results^[47]

Fig. 6. Schematic of DiPOLE100X system^[50]

Fig. 7. Schematic of HAPLS system^[55]

Fig. 8. Photo of HILADS pump array^[58]

Fig. 9. Fundamental frequency, frequency doubled pump light and short pulse main laser output curve^[61] (inset: output pulse shape stability curve and photo of operating laser)

Fig. 10. Layout of 100 J Hamamatsu system^[29]

Fig. 11. Photo of the cryogenic He-gas circulation cooling system^[68]

Fig. 12. Photo and schematic of pump coupling device of LUCIA system^[24]

Fig. 13. Three-dimensional temperature distribution and thermal deformation model results ^[77]. (a) Yb∶ YAG crystal; (b) Cr⁴⁺/Yb³⁺∶YAG co-sintered ceramic

Fig. 14. Schematic of TRAM configuration^[78]

Fig. 15. Schematic of multi-TRAM configuration^[79]

Fig. 16. CcAMA layout^[28]. (a) Conceptual design of 100 J 100 Hz amplifier; (b) three-dimensional model of active-mirror head

Fig. 17. Nd∶YAG-Nd∶LuAG hybrid amplifier^[90]. (a) Two-gain medium emission spectrum; (b) amplification chain output curve

Fig. 18. Layout of 10 J large-aperture hybrid active mirror chain^[33]

Fig. 19. Spatiotemporal characterization of amplified pulse in active mirror geometry^[95]. (a)(c) Spatiotemporal information of gain window for backward-and forward-propagating pulses; (b) pulse segments that overlap at a certain time

Fig. 20. Astigmatism measurement results^[36]. (a) Before adjustment; (b) after adjustment

Fig. 21. Schematic of HALNA system^[100]

Fig. 22. TECS technique^[32]. (a) Layout; (b) single-pass optical path difference along slab width of non-TECS mode (dashed line) and TECS mode (solid line); (c) optical path difference of non-TECS and TECS modes under different repetition rate

Fig. 23. Schematic of 5 J, 200 Hz system ^[37]