高能量掺Yb偏振型大模场面积光子晶体光纤孤子锁模飞秒激光器

High energy femtosecond soliton mode-locking laser based on Yb-doped single polarization large-mode-area photonic crystal fiber

实验研究了基于掺Yb偏振型大模场面积光子晶体光纤的孤子锁模激光器,获得了高脉冲能量的飞秒激光输出.激光器基于线形腔结构,利用光栅对补偿腔内色散,并通过半导体可饱和吸收镜实现锁模的自启动.实验中从振荡级直接获得了平均功率为700 mW,重复频率为47.3 MHz(对应于14.8 nJ的单脉冲能量),脉冲宽度为518 fs的稳定锁模脉冲输出.与普通孤子锁模飞秒光纤激光器相比,输出的单脉冲能量提高了两个数量级.

A high energy femtoseeond fiber laser based on Yb-doped single polarization large-mode-area photonie crystal fiber is demonstrated. A simple linear laser eavity is used. The laser works in soliton mode-loeking regime due to the negative dispersion generated by a pair of gratings implemented in the cavity, while the self-starting mode-locking operation is aehieved by sermieonduetor saturable absorber mirror. The fiber laser directly generates 518 fs laser pulses with the average power of 700 mW at the repetition rate of 47.3 MHz （corresponding to a pulse energy of 14.8 nJ）. The single pulse energy is two orders higher than that of conventional soliton mode-locking fiber laser.