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报道了一种支持高单脉冲能量输出的被动锁模飞秒光纤激光器.该激光器使用具有极低非线性系数的掺Yb3+双包层大模场面积偏振光子晶体光纤作为激光增益介质,具有很好的环境稳定性.激光器基于线形腔结构,没有色散补偿,利用半导体可饱和吸收镜(SESAM)实现自启动锁模,获得了平均功率为2.5W,重复频率为51.4 MHz(对应于50nJ的单脉冲能量),脉冲宽度为4.2ps的稳定的连续波锁模脉冲输出.经腔外色散补偿,脉冲宽度压缩至410fs.当激光器输出功率比较低时,脉冲成形由SESAM的非线性吸收决定,而在高功率输出的情况下,激光器的锁模运转主要取决于自相位调制展宽光谱与增益带宽的限制之间的平衡.
A passive mode-locked femtosecond fiber laser supporting a high monopulse energy output is reported.The laser uses a Yb3 + double-clad, large-mode-area polarized photonic crystal fiber with a very low nonlinear coefficient as the laser gain medium and has good Based on the linear cavity structure without any dispersion compensation, the self-starting mode-locking was achieved by using SESAM, the average power was 2.5W and the repetition frequency was 51.4 MHz (corresponding to a single pulse of 50nJ Energy), a pulse width of 4.2ps stable continuous-wave mode-locked pulse output by extra-cavity dispersion compensation, pulse width compression to 410fs. When the laser output power is relatively low, the pulse shaping is determined by the nonlinear absorption of SESAM, In the case of high power output, the mode-locked operation of the laser mainly depends on the balance between the self-phase modulation broadening spectrum and the gain bandwidth limitations.