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采用基于半导体可饱和吸收镜(SESAM)的被动锁模方案,通过三级主振荡功率放大(MOPA)结构,构建了平均输出功率39.2 W的全光纤皮秒脉冲光纤激光器。输出激光脉冲宽度10.7 ps,重复频率68 MHz。利用该皮秒光纤激光器泵浦一段4.5 m长的国产光子晶体光纤(PCF),实现了平均功率20.1 W的全光纤化结构超连续谱(SC)光纤激光输出。光谱宽度超出所用光谱仪600~1700 nm的观测范围,在观测范围内具有10 d B的光谱平坦度。
An all-fiber picosecond fiber laser with an average output power of 39.2 W was constructed by a three-stage main oscillator power amplifier (MOPA) using a passive mode-locking scheme based on SESAM. Output laser pulse width 10.7 ps, repetition frequency 68 MHz. A 4.5 m-long domestic PCF was pumped by the picosecond fiber laser to achieve an all-fiber superconducting (SC) fiber laser with an average power of 20.1 W. The spectral width exceeds the observed range of 600 to 1700 nm for the spectrometer used and has a spectral flatness of 10 dB over the observed range.