中国激光, 2017, 44 (2): 0201017, 网络出版: 2017-02-22
高重复频率宽光谱皮秒脉冲全光纤掺镱激光器 下载: 541次
Picosecond Pulsed All-Fiber Yb-Doped Laser with High Repetition Rate and Wide Spectrum
激光器 宽光谱 主振荡功率放大 非线性效应 被动锁模技术 声光调制 lasers wide spectrum master oscillator power amplifier nonlinear effect passively mode-locked technique acoustic-optic modulator
摘要
实验研究了高重复频率、宽光谱皮秒脉冲掺镱光纤激光器。该激光器为全光纤结构,采用主控振荡器的功率放大器技术,利用光纤中的非线性效应进行光谱的展宽。利用半导体可饱和吸收镜实现振荡器的被动锁模,输出中心波长为1031.3 nm,3 dB光谱宽度为1.51 nm,脉冲宽度为3.1 ps,重复频率为21.3269 MHz。再利用声光调制器使振荡器的重复频率降低到2.1 MHz,降频后的信号光通过三级掺镱光纤放大器,在30 μm/250 μm大模场双包层掺镱光纤中实现了功率主放大,最后得到平均功率为20 W、脉冲宽度为20.8 ps、光谱宽度为640~1700 nm、单脉冲能量为9.5 μJ、对应峰值功率为0.46 MW的脉冲激光输出。
Abstract
A high repetition rate and wide spectrum picosecond pulsed all-fiber Yb-doped laser is experimentally studied. The laser with all-fiber structure uses the master oscillator power amplifier technology. The broadening of the spectrum is caused by the nonlinear effect. Passively mode-locked technique of oscillator is realized by semiconductor saturable absorber mirror. The laser operates at 1031.3 nm with 3 dB spectral width of 1.51 nm. Its pulse width is 3.1 ps and the repetition frequency is 21.3269 MHz. An acoustic-optic modulator is applied to reduce the repetition rate to 2.1 MHz. The down-converted signal light passes through a three-stage Yb-doped fiber amplifier, and the main power amplification is realized in 30 μm/250 μm large mode field double-clad Yb-doped fiber. In the end, the pulse laser output is obtained with average output power of 20 W, pulse width of 20.8 ps, spectrum range from 640~1700 nm, single pulse energy of 9.5 μJ, and corresponding peak power of 0.46 MW.
李平雪, 王晓晓, 苏宁, 苏盟, 邵月, 肖坤, 刘建国. 高重复频率宽光谱皮秒脉冲全光纤掺镱激光器[J]. 中国激光, 2017, 44(2): 0201017. Li Pingxue, Wang Xiaoxiao, Su Ning, Su Meng, Shao Yue, Xiao Kun, Liu Jianguo. Picosecond Pulsed All-Fiber Yb-Doped Laser with High Repetition Rate and Wide Spectrum[J]. Chinese Journal of Lasers, 2017, 44(2): 0201017.