Jiang M, Sucha G, Fermann M E, Jimenez J, Harter D, Dagenais M, Fox S, Hu Y
Opt Lett. 1999 Aug 1;24(15):1074-6. doi: 10.1364/ol.24.001074.
We describe an erbium fiber laser that is passively mode locked by a novel, precision antireflection-coated semiconductor saturable-absorber mirror that incorporates an additional two-photon absorber. It is shown that passive mode locking evolves from a Q-switching instability. The results are achieved by use of saturable absorbers that provide a large (15%) nonlinear (saturable) loss. Exploiting two-photon absorption can substantially reduce the peak power of the Q-switched pulses, which results in improved reliability of the laser. Moreover, two-photon absorption can be used to produce an optimal stability range for saturable-absorber mode locking.
我们描述了一种铒光纤激光器，它由一种新型的、经过精密抗反射涂层处理的半导体可饱和吸收镜被动锁模，该吸收镜还集成了额外的双光子吸收体。研究表明，被动锁模是由调Q不稳定性演变而来的。这些结果是通过使用能提供15%的大非线性（可饱和）损耗的可饱和吸收体实现的。利用双光子吸收可大幅降低调Q脉冲的峰值功率，从而提高激光器的可靠性。此外，双光子吸收可用于为可饱和吸收体锁模产生最佳稳定范围。
