高吸收调制下掺铥锁模光纤激光器的数值研究

为了验证饱和吸收体参量对被动锁模掺铥光纤激光器的输出特性的影响,基于耦合Ginzburg-Landau方程进行了数值研究,阐明了掺铥锁模光纤激光器在高调制深度饱和吸收体调制下的时域和频域特性。结果表明,优化选择的高调制深度可饱和吸收体可以有效缩短脉宽,减小时间带宽积。此研究结果对发展稳定、超快中红外超快激光具有指导意义。

Numerical study on thulium-doped mode-locked fiber laser with high modulation depth of saturable absorber

In order to validate the impact of saturable absorber on output performance of thulium-doped mode-locked fiber laser, the effect of parameters of saturable absorber was numerically studied based on the coupled Ginzburg-Landau equation. The time domain and frequency domain characteristics of thulium-doped mode-locked fiber laser modulated by high modulation depth saturable absorber were discussed. The results show that pulse width is shortened and time-bandwidth product decreases effectively by choosing high modulation depth saturable absorber with suitable modulation depth. The result would provide some design guidelines for the developing of the steady, ultrafast mid-infrared fiber lasers.