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报道了一种基于反射式石墨烯可饱和吸收镜锁模的全保偏掺铒光纤激光器。分别使用单层和十层石墨烯作为可饱和吸收器件,通过全保偏结构,避免了外界环境对腔内偏振态的影响,获得了高稳定性、高偏振度、易自启动的锁模脉冲输出,脉冲宽度分别为697 fs和502 fs。实验表明,十层石墨烯相比于单层石墨烯能够获得更窄的脉冲宽度,更高的峰值功率,具有好的锁模效果。研究同时发现,经十层石墨烯锁模,进一步提高泵浦功率,可在全保偏光纤腔中获得重复频率62.94 MHz的二阶谐波锁模脉冲输出。并通过非线性薛定谔方程对谐波锁模产生的机理进行了分析。这种基于反射式可饱和吸收镜的全保偏锁模光纤激光器有望成为实现基频锁模与谐波锁模可切换的单偏振激光源。
A fully-preserved erbium-doped fiber laser based on a reflective graphene saturable absorption mirror was reported. Using single layer and ten layers of graphene as the saturable absorption device respectively, the polarization state of the external environment is avoided by the fully-preserved partial structure, and the mode-locked pulse with high stability, high polarization and easy self-starting is obtained Output, pulse width of 697 fs and 502 fs. Experiments show that ten-layer graphene can obtain narrower pulse width and higher peak power than single-layer graphene, and has good mode-locking effect. The research also found that the second order harmonic mode-locked pulse output with repetition frequency of 62.94 MHz can be obtained in the full polarization-maintaining fiber cavity by clamping the ten layers of graphene to further increase the pump power. The mechanism of harmonic mode-locking is analyzed by the nonlinear Schrödinger equation. This fully reflective polarization-mode-locked fiber laser based on a reflective saturable absorption mirror is expected to become a single polarization laser source that can be switched between fundamental frequency mode-locked and harmonic mode-locked mode.