Liang Sijing, Xu Lin, Fu Qiang, Jung Yongmin, Shepherd David P, Richardson David J, Alam Shaif-Ul
Opt Express. 2018 Mar 19;26(6):6490-6498. doi: 10.1364/OE.26.006490.
We report a gain-switched diode-seeded thulium doped fiber master oscillator power amplifier (MOPA) producing up to 295-kW picosecond pulses (35 ps) at a repetition rate of 1 MHz with a good beam quality (M ~1.3). A narrow-band, grating-based filter was incorporated within the amplifier chain to restrict the accumulation of nonlinear spectral broadening and counter-pumping of a short length of large-mode-area (LMA) fiber was used in the final stage amplifier to further reduce nonlinear effects. Finally, we generated watt-level >2.5-octave supercontinuum spanning from 750 nm to 5000 nm by using the MOPA output to pump an indium fluoride fiber.
我们报道了一种增益开关二极管种子掺铥光纤主振荡功率放大器（MOPA），它能以1 MHz的重复频率产生高达295 kW的皮秒脉冲（35 ps），光束质量良好（M²~1.3）。在放大器链中加入了一个基于光栅的窄带滤波器，以限制非线性光谱展宽的积累，并在末级放大器中使用短长度大模面积（LMA）光纤的反向泵浦来进一步降低非线性效应。最后，我们通过使用MOPA输出泵浦氟化铟光纤，产生了覆盖750 nm至5000 nm的瓦级>2.5倍频程超连续谱。
