Passively Q-switched Yb:YAG/Cr:YAG ceramics miniature lasers with peak power > 150 kW and nearly diffraction-limited beam quality

摘要

Passively Q-switched Yb:YAG microchip laser with 530 ps pulse width has been obtained by using SESAM[1] as saturable absorber. Recently, laser-diode pumped passively Q-switched Yb:YAG/Cr:YAG all-ceramic microchip laser has been demonstrated[2], pulse energy of 31 μJ, pulse width of 380 ps has been achieved. However, there is coating damage occurrence because of the high energy fluence with low transmission of the output coupler. High transmission of the output coupler will decease the intracavity pulse energy fluence. Here we report on the high peak power laser performance of Yb:YAG/Cr:YAG all-ceramic miniature laser by using low initial transmission of the Cr{sup}(4+):YAG and high transmission of the output coupler.