Dipartimento di Fisica-Politecnico di Milano and Istituto di Fotonica e Nanotecnologie-CNR, Milano, Italy.
Opt Lett. 2013 Aug 1;38(15):2757-9. doi: 10.1364/OL.38.002757.
A Tm-Ho:fiber amplifier based on single-clad geometry is demonstrated for the generation of high-power femtosecond pulses around 1.9 μm. The amplifier is seeded by the low-power Raman soliton generated by an Er:fiber femtosecond laser. Pulse trains at a repetition rate of 250 MHz tunable from 1.84 to 1.92 μm with corresponding powers from 2.6 to 3 W and durations from 80 to 105 fs have been obtained. Beating with a single-frequency Tm laser has shown that the pulse coherence is highly preserved. The overall power fluctuations have been measured to be as low as 0.6%.
基于单包层结构的 Tm-Ho:光纤放大器在产生 1.9μm 附近的高功率飞秒脉冲方面得到了演示。该放大器由掺铒光纤飞秒激光器产生的低功率拉曼孤子种子。在重复率为 250MHz 的情况下，脉冲序列可调谐范围为 1.84μm 至 1.92μm，相应的功率为 2.6W 至 3W，脉宽为 80fs 至 105fs。与单频 Tm 激光器的拍频表明，脉冲相干性得到了很好的保持。测量得到的总功率波动低至 0.6%。
