Kuan Wen-Hsuan, Kao Li-Ting, Wang Jing-Yun, Lin Kuei-Huei
Opt Lett. 2018 Jan 15;43(2):341-344. doi: 10.1364/OL.43.000341.
We report a passively mode-locked erbium-doped fiber laser with pulse widths switchable from 473 fs to 76.8 ns, where the fundamental mode-locking, noise-like pulse, nanosecond mode-locking, and dual-width mode-locking (DML) are obtained by adjusting a polarization controller. Co-existence of femto- and nano-second pulses in DML is attributed to the gain balancing. Analytic modeling of the fiber laser with the cubic-quintic Ginzburg-Landau equation is presented, in which the pulse widths are calculated as functions of dispersion, self-phase modulation (SPM), cubic saturable absorption (SA), and quintic SA. The generation of nanosecond pulses is caused by the weakened intracavity pulse-shortening strength, the reduced effective SPM, and the inclusion of quintic SA in the laser cavity.
我们报道了一种被动锁模掺铒光纤激光器，其脉冲宽度可在473飞秒至76.8纳秒之间切换，通过调整偏振控制器可实现基模锁模、类噪声脉冲、纳秒级锁模和双宽度锁模（DML）。DML中飞秒和纳秒脉冲的共存归因于增益平衡。给出了用立方 - 五次金兹堡 - 朗道方程对光纤激光器进行的解析建模，其中脉冲宽度是作为色散、自相位调制（SPM）、立方饱和吸收（SA）和五次SA的函数来计算的。纳秒脉冲的产生是由于腔内脉冲缩短强度减弱、有效SPM降低以及激光腔内包含五次SA。
