2.79 μm LGS electro-optical Q-switched Er, Cr: YSGG laser

2.79 μm-band pulsed laser has important application prospects in medicine, military, etc. In this paper, the pulse operation of Er, Cr: YSGG laser Q-switched by piezoelectric crystal La3Ga5SIO14(LGS) is realized, and high-energy output under nanosecond pulse is obtained. In the experiment, LGS crystal was used as the de-voltage Q-switching element. At a repetition frequency of 10 Hz, the obtained pulse width was 27.4 ns, the corresponding single pulse maximum output energy was 136 mJ, and the dynamic–static energy conversion efficiency was 75.6%; The output beam quality factor M2 obtained by self-made spot analysis software in the x and y directions are 1.34 and 1.40, respectively.