单端光纤耦合的声光调Q全光纤化光纤激光器

实现了一种单端光纤耦合的高重复频率、窄脉冲、窄线宽及高效率的主动声光调Q全光纤脉冲光纤激光器。该光纤激光器基于光纤光栅与平面镜组合而成的线性法布里珀罗(F-P)腔结构，采用激光二极管与(2+1)×1抽运耦合器形成后向抽运，并利用单端光纤耦合声光调制器(AOM)实现了全光纤化结构的脉冲掺镱双包层光纤激光器。调Q声光开关工作在一级方向，反向输出调Q脉冲，重复频率20~100 kHz可调。在重复频率50 kHz、抽运功率5.7 W下系统获得了输出激光功率2.64 W、单脉冲能量528 μJ、脉宽56 ns、峰值功率943 W的稳定的高效率、窄线宽的窄脉冲，中心波长在1080 nm左右，线宽为0.06 nm，光光转换效率高达46%。

Abstract

A single-ended fiber coupled actively acousto-optic Q-switched all-fiber laser with high-repetition-rate, short pulse duration, narrow line-width and high efficiency is experimentally demonstrated. Based on the combination of fiber grating and plane mirror providing a linear Fabry-Perot (F-P) cavity, the fiber laser is working on the backward-pump scheme by use of laser diode and (2+1)×1 pump coupler, achieving all-fiber structured pulse ytterbium-doped double-clad fiber laser by adopting single-ended fiber coupled acousto-optic modulator (AOM). AOM operates in the first direction and inversely outputs, inverted output Q-switched pulse with repetition rate of 20~100 kHz adjustable. At the repetition rate of 50 kHz and pump power of 5.7 W, laser system outputs highly efficient, stable, narrow line-width short pulse of 2.64 W average power, corresponding to single pulse energy of 528 μJ, pulse duration of 56 ns and peak power of 943 W. The center wavelength of laser is around 1080 nm with line-width of 0.06 nm, and the optical-optical conversion efficiency is as high as 46%.

参考文献

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何晶, 赵宏明, 周军, 杜松涛, 董景星, 魏运荣. 单端光纤耦合的声光调Q全光纤化光纤激光器[J]. 中国激光, 2012, 39(5): 0502008. He Jing, Zhao Hongming, Zhou Jun, Du Songtao, Dong Jingxing, Wei Yunrong. Single-Ended Fiber Coupled Acousto-Optic Q-Switched All-Fiber Laser[J]. Chinese Journal of Lasers, 2012, 39(5): 0502008.

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