中国激光, 2018, 45 (6): 0601001, 网络出版: 2018-07-04
短脉冲间隔脉冲组输出电光调Q Nd∶YAG激光器
Electro-Optic Q -Switched Nd∶YAG Laser with Short Pulse Interval and Pulse Group Output
激光器 电光开关 脉冲间隔可调 脉冲个数可调 台阶式开启 lasers electro-optic switch adjustable pulse interval adjustable pulse number stepped open
摘要
提出了一种短脉冲间隔、子脉冲峰值功率高的脉冲组输出电光调Q 激光器。以激光二极管(LD)侧面抽运Nd∶YAG晶体,谐振腔单次储能,控制Q 开关台阶式多次开启,将单次抽运能量分多次调Q 输出,实现短脉冲间隔脉冲组激光输出,为高重复频率、高峰值功率激光器提供研究思路。实验结果表明,用一组半环形激光二极管模块作为工作物质Nd∶YAG的抽运源,铌酸锂(LN)晶体作为Q 开关,激光二极管模块单次抽运工作物质储能,台阶式开启Q 开关,激光器在1~20 Hz频率范围内能够稳定运行,得到子脉冲间隔最小为100 ns的脉冲组输出,子脉冲频率在1.1~10.0 MHz范围内可调,子脉冲能量大于23 mJ,能量波动小于10%,单个脉冲宽度小于37 ns,子脉冲峰值功率接近1 MW,光-光转换效率为22.5%。
Abstract
A kind of electro-optic Q-switched laser in the form of pulse group output with short pulse interval and high subpulse peak power is proposed. The Nd∶YAG crystal is pumped by the diode laser (LD) module, and the single energy storage of resonant cavity is achieved. On the basis of controlling the Q-switch steps open repeatedly, single pump energy can be divided into multiple times Q-switched outputs and the short pulse interval and pulse group laser output are obtained, providing a research way for high repetition frequency and high peak power laser. Results show that with a group of half ring laser diode module as the source for Nd∶YAG crystal, lithium niobate (LN) crystal as the Q-switch, storage material is single pumped by laser diode module, and the Q-switch is stepped opened, the laser can be stably operation in the range of 1-20 Hz, minimum subpulse interval of 100 ns is obtained and subpulse frequency ranges in 1.1-10.0 MHz, subpulse energy is greater than 23 mJ and energy fluctuation is less than 10%, single pulse width is less than 37 ns, subpulse peak power is close to 1 MW, and the optical-optical conversion efficiency is 22.5%.
连亚霄, 王超, 王頔, 段育盛, 郭俊文, 金光勇. 短脉冲间隔脉冲组输出电光调