163 fs被动锁模掺Er^(3+)光纤激光器

163 fs Passively Mode-locked Er^(3+)-doped Fiber Ring Laser

研制了一种采用非线性偏振旋转锁模效应的被动锁模掺Er3+飞秒激光器。利用性能稳定的980 nm激光二极管(LD)作为抽运光源,以高掺杂Er3+光纤为增益介质,在抽运功率为650 m W时,激光器锁模输出重复频率为31.25 MHz、平均输出功率为70 m W、中心波长为1565 nm、光脉冲宽度为163 fs的稳定飞秒脉冲激光。该激光器易于操作和调节,并且锁模状态稳定可以长时间的运行,其光纤结构更有利于小型化和便携化。

A passively mode-locked fiber ring laser with a small segment of Er3 ＋-doped fiber as gain medium,pumped by a stable 980 nm laser diode and mode-locked by the nonlinear polarization rotation（ NPR） technique,was successfully achieved. When the laser was pumped at650 m W,stable mode-locked pulses centered at 1560 nm with 163 fs pulse width,and the output power was 70 m W. The repetition rate is31. 25 MHz. The laser presented here has advantages of being easy to operate and adjust,long-running and better stability. The fiber structure is of miniaturization,integration and portability.