Opt Lett. 2018 Oct 15;43(20):5154-5157. doi: 10.1364/OL.43.005154.
We demonstrate a mode-locked (ML) femtosecond laser based on the disordered garnet crystal Tm,Ho:CNGG. Employing a single-walled carbon nanotube saturable absorber, pulses as short as 83 and 76 fs at 2081 nm are achieved without and with external compression, respectively. The latter represents, to the best of our knowledge, the shortest pulse duration obtained from any Ho-doped or Tm,Ho-codoped laser. The average power amounts to 67 mW at a repetition rate of 102 MHz. By analyzing the soliton ML regime, the nonlinear refractive index of Tm,Ho:CNGG is estimated to be ∼1.1×10 m/W.
我们展示了一种基于无序石榴石晶体 Tm，Ho:CNGG 的锁模（ML）飞秒激光器。采用单壁碳纳米管可饱和吸收体，在没有和有外部压缩的情况下，分别实现了最短为 83 和 76 fs 的脉冲。据我们所知，后者是从任何掺 Ho 或 Tm，Ho 共掺激光器中获得的最短脉冲持续时间。在 102 MHz 的重复率下，平均功率达到 67 mW。通过分析孤子 ML 模式，估计 Tm，Ho:CNGG 的非线性折射率约为 1.1×10 m/W。
