We generate attosecond pulse train (APT) in argon driven by the high repetition rate (HR) laser of the extreme light infrastructure-attosecond light pulse source (ELI-ALPS), providing 100 kHz, 80 W, 1030 nm, 40 fs pulses from a fiber chirped-pulse amplification (fiber-CPA) laser system. Under the current operating conditions of the high harmonic generation beamline (HR-GHHG), we observed the average pulse duration to be 395 as measured using the technique of reconstruction of attosecond beating by interference of two-photon transitions. The beamline uses an annular-shape laser beam so that the main part of the driving laser co-propagating with the APT can be eliminated by reflection on a holey mirror. An additional 100 nm aluminum foil is used to filter out the remaining laser and the low order harmonics, allowing 2 pJ APT with a bandwidth from 25 eV to 50 eV to be transported to the target position where the APT interacts with matter. The implementation of the HR-GHHG beamline ...

中文翻译：

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在ELI-ALPS 100 kHz重复频率光束线上产生阿秒脉冲

我们在极端光基础设施的高重复频率（HR）激光器的驱动下在氩气中产生阿秒脉冲串（APT）-阿秒光脉冲源（ELI-ALPS），可提供100 kHz，80 W，1030 nm，40 fs的脉冲光纤chi脉冲放大（fiber-CPA）激光系统。在高谐波发生光束线（HR-GHHG）的当前工作条件下，我们观察到平均脉冲持续时间为395，这是通过利用两光子跃迁的干扰重建阿秒跳动的技术测得的。光束线使用环形激光束，因此可以通过在多孔镜上反射来消除与APT共同传播的驱动激光的主要部分。另外使用100 nm铝箔来滤除剩余的激光和低阶谐波，允许将带宽从25 eV到50 eV的2 pJ APT传输到APT与物质相互作用的目标位置。HR-GHHG光束线的实施...