摘要
报道了一台全光纤结构主振荡功率放大(MOPA)型掺镱脉冲光纤激光器。种子源是工作波长为1064 nm的声光调Q光纤激光器,可以获得重复频率在20～50 kHz间可调、平均输出功率约2 W的随机偏振脉冲种子激光。以大直径保偏(PM)光纤作为增益介质,在6个单管功率10W,波长为915 nm的半导体激光器抽运下,种子激光经过一级放大最终获得平均输出功率23.5W,脉冲宽度约为30 ns,偏振抑制比超过10 dB,光束质量因子M2为1.36的线偏振单模脉冲激光输出。讨论了大直径保偏光纤与种子激光输出光纤的模场不匹配性对输出激光的光束质量和光谱特性的影响。
An all-fiberized master oscillator power amplifier（MOPA） structured pulsed Yb fiber laser is reported. The seed source was an acousto-optic （AO） Q-switched Yb fiber laser working at 1064 nm and emitting a random polarized pulsed emission with an average power of 2 W at repetition rates between 20 kHz and 50 kHz. Using a polarization maintaining（PM） large mode field double-cladding fiber as the gain medium and six LDs each with 10 W power output at 915 nm as the pump, the Yb fiber amplifier delivered a linearly polarized pulsed emission output at 1064 nm with an average power of 23.5 W, pulse duration about 30 ns, polarization extinction ratio greater than 10 dB, and a beam quality factor M^2 of 1.36. The effect of mode field mismatch between the output fiber of seed laser and the large mode field PM fiber, which influenced the beam quality and the spectral distribution of the laser output, was discussed.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2009年第7期1861-1865,共5页
Chinese Journal of Lasers
基金
国家自然科学基金(60778001)
浙江省重大科技专项(2008C01052-4)资助项目
关键词
激光器
Yb光纤激光器
单模
脉冲
线偏振
模场匹配
lasers
Yb fiber laser
single-mode
pulse
linearly polarization
mode field match
