High-power thulium fiber laser Q switched with single-layer graphene.

  title={High-power thulium fiber laser Q switched with single-layer graphene.},
  author={Yulong Tang and Xuechao Yu and Xiaohui Li and Zhiyu Yan and Qi Jie Wang},
  journal={Optics letters},
  volume={39 3},
We report high-power 2 μm Tm3+ fiber lasers passively Q switched by double-piece single-layer graphene transferred onto a glass plate. Through manipulating intracavity laser beam size and increasing pump ratios, an average power of 5.2 W is directly achieved from the laser oscillator with an optical-to-optical slope efficiency of 26%. The laser pulse energy can be as high as ∼18  μJ, comparable to that from actively Q-switched fiber lasers. The narrowest pulse width is 320 ns, and the pulse… CONTINUE READING