The development of attosecond pump–probe experiments at high repetition rate requires the development of novel attosecond sources maintaining a sufficient number of photons per pulse. We use 7 fs, 800 nm pulses from a non-collinear optical parametric chirped pulse amplification laser system to generate few-pulse attosecond pulse trains (APTs) with a flux of >10 6 photons per shot in the extreme ultraviolet at a repetition rate of 100 kHz. The pulse trains have been fully characterised by recording frequency-resolved optical gating for complete reconstruction of attosecond bursts (FROG-CRAB) traces with a velocity map imaging spectrometer. For the pulse retrieval from the FROG-CRAB trace a new ensemble retrieval algorithm has been employed that enables the reconstruction of the shape of the APTs in the presence of carrier envelope phase fluctuations of the few-cycle laser system.

中文翻译：

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以100 kHz重复频率生成和表征几个脉冲的阿秒脉冲串

在高重复率下发展阿秒泵浦-探针实验需要开发新颖的阿秒光源，以维持每个脉冲足够数量的光子。我们使用来自非共线光学参量chi脉冲放大激光系统的7 fs，800 nm脉冲，以极高的重复频率在极紫外光下产生几脉冲的阿秒脉冲串（APT），每发光通量大于10 6个光子。 100 kHz。通过记录频率分辨的光学门控来完全表征脉冲序列，以利用速度图成像光谱仪完整重建阿秒脉冲（FROG-CRAB）轨迹。