用性能稳定的976 nm激光二极管(LD)作为抽运光源,利用非线性偏振旋转(NPR)作为可饱和吸收体,实现了环形腔结构的被动锁模掺Er3+光纤激光器。在抽运功率为57 mW时,通过调节与波长无关的全光纤在线偏振控制器,获得了谱线宽度为40.8 nm,中心波长1544.0 nm,脉冲宽度为78 fs的稳定飞秒脉冲激光,其重复频率为11.18 MHz,平均输出光功率为5.4 mW,单个脉冲能量为0.5 nJ,峰值功率为6200 W。

A passively mode-locked fiber ring laser with a small segment of Er3+-doped fiber as gain medium, pumped by stable 976 nm laser diode (LD) and mode-locked by the nonlinear polarization rotation (NPR) technique, was successfully achieved. When the laser was pumped at 57 mW, stable mode-locked pulses centered at 1544.0 nm with 40.8 nm spectral bandwidth and 78 fs pulse width were obtained at the repetition rate of 11.18 MHz by modulating the wavelength-independent all-fiber on-line polarization controller. The output power of the laser was 5.4 mW, the pulse energy was about 0.5 nJ and the peak power was 6200 W.