Fischer Julian, Drs Jakub, Labaye François, Modsching Norbert, Wittwer Valentin J, Südmeyer Thomas
Opt Express. 2021 Feb 15;29(4):5833-5839. doi: 10.1364/OE.414444.
We demonstrate that Kerr lens modelocking is well-suited for operating an ultrafast thin-disk laser with intra-oscillator high harmonic generation (HHG) in the 100-fs pulse duration regime. Exploiting nearly the full emission bandwidth of the gain material Yb:YAG, we generate 105-fs pulses with an intracavity peak power of 365 MW and an intracavity average power of 470 W. We drive HHG in argon with a peak intensity of ∼7⋅10 W/cm at a repetition rate of 11 MHz. Extreme-ultraviolet (XUV) light is generated up to the 31 harmonic order (H31) at 37 eV, with an average power of ∼0.4 µW in H25 at 30 eV. This work presents a considerable increase in performance of XUV sources based on intra-oscillator HHG and confirms that this approach is a promising technology for simple and portable XUV sources at MHz repetition rates.
我们证明，克尔透镜锁模非常适合用于运行一个超快薄片激光器，该激光器在100飞秒脉冲持续时间范围内具有腔内高次谐波产生（HHG）。利用增益材料Yb:YAG几乎整个发射带宽，我们产生了105飞秒脉冲，腔内峰值功率为365兆瓦，腔内平均功率为470瓦。我们以11兆赫兹的重复频率在氩气中驱动HHG，峰值强度约为7×10¹³瓦/平方厘米。在37电子伏特处产生了高达31次谐波（H31）的极紫外（XUV）光，在30电子伏特的H25中平均功率约为0.4微瓦。这项工作显著提高了基于腔内HHG的XUV源的性能，并证实这种方法是一种有前途的技术，可用于产生兆赫兹重复频率的简单便携式XUV源。
