%A Xin Zhao(赵鑫), Zheng Song(宋政), Yuan-Ji Li(李渊骥), Jin-Xia Feng(冯晋霞), Kuan-Shou Zhang(张宽收) %T High efficiency sub-nanosecond electro-optical Q-switched laser operating at kilohertz repetition frequency %0 Journal Article %D 2020 %J Chin. Phys. B %R 10.1088/1674-1056/ab8ac4 %P 84205-084205 %V 29 %N 8 %U {https://cpb.iphy.ac.cn/CN/abstract/article_122671.shtml} %8 2020-08-05 %X Based on a theoretical model of Q-switched laser with the influences of the driving signal sent to the Pockels cell and the doping concentration of the gain medium taken into account, a method of achieving high energy sub-nanosecond Q-switched lasers is proposed and verified in experiment. When a Nd:YVO4 crystal with a doping concentration of 0.7 at.% is used as a gain medium and a driving signal with the optimal high-level voltage is applied to the Pockels cell, a stable single-transverse-mode electro-optical Q-switched laser with a pulse width of 0.77 ns and a pulse energy of 1.04 mJ operating at the pulse repetition frequency of 1 kHz is achieved. The precise tuning of the pulse width is also demonstrated.