Song Rui, Hou Jing, Chen Shengping, Yang Weiqiang, Lu Qisheng
College of Optoelectronic Science and Engineering, National University of Defense Technology, Chang Sha, China.
Appl Opt. 2012 May 1;51(13):2497-500. doi: 10.1364/AO.51.002497.
An all-fiber high-power picosecond laser is constructed in a master oscillator power amplifier configuration. The self-constructed fiber laser seed is passively mode locked by a semiconductor saturable absorber mirror. Average output power of 157 W is obtained after three stages of amplification at a fundamental repetition rate of 60 MHz. A short length of ytterbium double-clad fiber with a high doping level is used to suppress nonlinear effects. However, a stimulated Raman scattering (SRS) effect occurs owing to the 78 kW high peak power. A self-made all-fiber repetition rate increasing system is used to octuple the repetition rate and decrease the high peak power. Average output power of 156.6 W is obtained without SRS under the same pump power at a 480 MHz repetition rate with 0.6 nm line width.
采用主振荡功率放大器结构构建了全光纤高功率皮秒激光器。自制的光纤激光种子源由半导体可饱和吸收镜被动锁模。在60MHz的基频重复频率下经过三级放大后，获得了157W的平均输出功率。使用短长度、高掺杂水平的镱双包层光纤来抑制非线性效应。然而，由于78kW的高峰值功率，产生了受激拉曼散射（SRS）效应。使用自制的全光纤重复频率增加系统将重复频率提高到八倍，并降低高峰值功率。在相同泵浦功率下，以480MHz的重复频率和0.6nm的线宽获得了156.6W的平均输出功率且无SRS效应。
