Descamps Dominique, Guichard Florent, Petit Stéphane, Beauvarlet Sandra, Comby Antoine, Lavenu Loïc, Zaouter Yoann
Opt Lett. 2021 Apr 15;46(8):1804-1807. doi: 10.1364/OL.419683.
We present an efficient and robust scheme to produce energetic sub-15 fs pulses centered at 515 nm with a peak power exceeding 3 GW. Combining efficient second-harmonic generation of a 135 fs, 50 W Yb-doped fiber amplifier with a low-loss capillary-based visible pulse compression stage, we reach an overall efficiency higher than >20. The system is also designed to take advantage of the repetition rate flexibility of the fiber amplifier, leading sub-15 fs pulse generation from 166 to 500 kHz with an average power exceeding the 10 watt level. The combined reduction of the laser wavelength and pulse duration is expected to highly improve the yield of high-order harmonic generation to provide high photon flux of ultrashort extreme ultraviolet radiation.
我们提出了一种高效且稳健的方案，以产生中心波长为515 nm、脉宽低于15 fs且峰值功率超过3 GW的高能脉冲。通过将135 fs、50 W掺镱光纤放大器的高效二次谐波产生与基于低损耗毛细管的可见光脉冲压缩阶段相结合，我们实现了高于20%的整体效率。该系统还设计为利用光纤放大器的重复频率灵活性，在166至500 kHz范围内产生脉宽低于15 fs的脉冲，平均功率超过10瓦。预计激光波长和脉冲持续时间的共同缩短将极大提高高次谐波产生的效率，以提供高光子通量的超短极紫外辐射。
