A high beam quality diode-pumped Nd:YAG active mirror laser amplifier was demonstrated. The size of Nd:YAG crystal was 48 mm x 42 mm x 11 mm with 0.6 at.% doped. When the pump energy was 26.8 J and the input energy was 0.3 J, the output pulse energy reached 5.4 J, the pulse width of 11.3 ns at 5 Hz repetition rate was obtained for the two gain modules in three-pass amplification, corresponding optical-to-optical efficiency was 21.2%. The beam quality was measured as M_x^2=2.48, and M_y^2=2.43 in horizontal and vertical directions, respectively.
Liu Jing, Li Lei, Shi Xiangchun, chen rufeng, Wang Jianlei, Chen Weibiao. High-beam-quality, 5.4 J, 5 Hz diode-pumped Nd:YAG active mirror laser amplifier[J]. Chinese Optics Letters, 2018, 16(12): .
