67毫焦，137纳秒窄带宽355纳米紫外激光。

67 mJ, 137 ns narrow bandwidth 355 nm UV laser.

作者信息

Li Jiatong, Zhou Xue, Zhang Jiayu, Ma Tiejun, Nie Hongkun, Yang Kejian, He Jingliang, Zhang Baitao

出版信息

Opt Lett. 2023 Nov 1;48(21):5599-5602. doi: 10.1364/OL.502328.

Abstract

A high-efficiency, high-energy, narrow bandwidth, hundred-nanosecond pulse width 355 nm ultraviolet (UV) laser was realized. A high-energy single-frequency 1064 nm fundamental laser was demonstrated firstly with multistage end-pumped preamplifiers and side-pumped main amplifiers. The corresponding pulse energy, repetition rate, pulse duration, bandwidth, and beam quality factor M were determined to be 221 mJ, 100 Hz, 156 ns, 2.25 MHz, and 1.23, respectively. By using type-I phase-matching LBO crystal for second harmonic generation (SHG) and type-II phase-matching LBO crystal for the sum frequency generation of the third harmonic, 67 mJ, a narrow bandwidth 355 nm UV laser was obtained with a pulse width of 137 ns and an energy stability of RMS < 1.2%@2 h. The fundamental to UV optical conversion efficiency was 30.3%. Our results provided a new way for generating high-energy, narrow bandwidth hundred-nanosecond 355 nm UV lasers used for direct-detection Doppler wind lidar (DWL) system.

摘要

实现了一台高效、高能、窄带宽、脉宽为百纳秒的355 nm紫外（UV）激光器。首先采用多级端面泵浦前置放大器和侧面泵浦主放大器，演示了一台高能单频1064 nm基频激光器。测定其相应的脉冲能量、重复频率、脉冲持续时间、带宽和光束质量因子M分别为221 mJ、100 Hz、156 ns、2.25 MHz和1.23。通过使用I型相位匹配的LBO晶体进行二次谐波产生（SHG），以及II型相位匹配的LBO晶体进行三次谐波的和频产生，获得了能量为67 mJ、带宽窄的355 nm紫外激光器，其脉冲宽度为137 ns，能量稳定性为RMS < 1.2%@2 h。基频到紫外的光转换效率为30.3%。我们的结果为用于直接探测多普勒测风激光雷达（DWL）系统的高能、窄带宽百纳秒355 nm紫外激光器的产生提供了一种新方法。