用大模场光子晶体光纤获得高功率飞秒激光

Large-Mode-Area Photonic Crystal Fiber Laser Output High Average Power Femtosecond Pulses

最近许多实验结果表明掺Yb光纤在提高输出功率方面还有很大潜力,而且由于大模面积光子晶体光纤的使用,飞秒光纤激光器的输出已经可以与传统飞秒固体激光器相比拟。报道了利用掺Yb的保偏型大模面积光子晶体光纤进行锁模和放大方面取得的实验结果,光子晶体光纤振荡级输出重复频率为51 MHz,脉冲宽度为450 fs,平均功率为2 W的飞秒激光,对应单脉冲能量40 nJ;同时利用国产双包层大模面积光纤进行了放大实验,在平均功率为毫瓦量级的种子光脉冲输入情况下,获得了103增益。

Many experiments have proven the potential of power scaling of Yb-doped fibers when they are used in lasers and amplifiers. Recently, photonic crystal fibers have pushed the output parameters of femtosecond fiber laser to compare to the solid-state laser system. Our recently work on this field is presented in this paper. A mode-locking high energy photonic crystal fiber laser operating in the dispersion compensation free regime generates positivelychirped pulses with an average power 2 W of 51 MHz in a stable and self-starting operation. The energy of the pulse is up to 40 nJ and the pulse duration is 450 fs. A domestic Yb-doped double-cladding large-mode-area fiber was used for amplication experiment. With the milliwatt seed laser pulse inputting, 103 gain was obtained.