利用非线性偏振旋转锁模方法并引进激光谐振腔色散管理,在1550 nm波段上用展宽脉冲全光纤激光器直接产生50 fs无波分裂的高能量脉冲输出。在330 mW的抽运功率下平均输出功率为56.4 mW,单脉冲能量达到1.5 nJ。因为是全光纤结构,激光器的转换效率高达17%。输出光谱平滑,无任何边带存在,激光器处于无波分裂的单脉冲输出状态。

Using the nonlinear polarization rotation mode-locking and cavity dispersion management,we report the direct generation of 50-fs pulses from a stretched-pulse Er-doped ring laser with all-fiber construction.The average output power was 56.4 mW under a 330 mW pump power with a repetition rate of 37.8 MHz,which had relatively high conversion efficiency of 17% for all-fiber construction.The pulse energy was greatly improved to 1.5 nJ.The smooth output spectrum without any side lobe showed the laser worked on the single-pulse operation.