激光与光电子学进展, 2018, 55 (8): 082804, 网络出版: 2018-08-13
机载激光雷达用高重复频率亚纳秒双波长全固态激光器 下载: 1461次
High Repetition Rate Sub-Nanosecond Dual-Wavelength Solid-State Laser for Airborne Lidar
激光器 亚纳秒 电光调Q 激光放大器 双波长 lasers sub-nanosecond electro-optics Q-switch laser amplifier dual-wavelength
摘要
研究了晶体材料、腔长、抽运功率等对调Q脉冲宽度的影响,研制了一台基于Nd∶YVO4晶体的高效率、结构紧凑的双波长激光器。该激光系统采用主振荡功率放大(MOPA)结构,振荡级产生重复频率为5 kHz、脉冲能量为400 μJ、脉冲宽度为1.1 ns的1064 nm基横模激光,通过878.6 nm零线抽运的Nd∶YVO4级联放大器,脉冲能量和脉冲宽度变为2.72 mJ和1.03 ns;通过三硼酸锂(LBO)晶体腔外倍频,获得了脉冲能量为1.54 mJ,倍频效率大于56%,激光脉冲宽度小于910 ps,峰值功率为1.7 MW的532 nm绿光激光输出。
Abstract
The effect of crystal material, cavity length, pump power and other parameters on the width of Q-switched pulse is investigated, and a compact dual-wavelength laser with high efficiency based on Nd∶YVO4 crystal is developed. Master oscillator power amplifier (MOPA) structure is used in the laser system. A transverse fundamental mode of 1064 nm pulse with repetition frequency of 5 kHz, pulse energy of 400 μJ and pulse width of 1.1 ns is generated in the oscillator. Through the 878.6 nm zero-line pumped cascade amplifier, pulse energy and pulse duration turn to 2.72 mJ and 1.03 ns, respectively. A 532 nm green laser pulse with energy of 1.54 mJ, second harmonic generation efficiency larger than 56%, pulse duration shorter than 910 ps and peak power of 1.7 MW is obtained through the external frequency doubling by lithium triborate (LBO) crystal.
陆俊, 丁建永, 贺岩, 于广礼, 杨彬, 姚红权, 周军. 机载激光雷达用高重复频率亚纳秒双波长全固态激光器[J]. 激光与光电子学进展, 2018, 55(8): 082804. Lu Jun, Ding Jianyong, He Yan, Yu Guangli, Yang Bin, Yao Hongquan, Zhou Jun. High Repetition Rate Sub-Nanosecond Dual-Wavelength Solid-State Laser for Airborne Lidar[J]. Laser & Optoelectronics Progress, 2018, 55(8): 082804.