Abstract
With the development of lasers emitting pulses with ever decreasing durations and increasing energies, the importance of high-harmonic generation (HHG) in gases as a tool for precision measurements in the extreme ultraviolet (XUV) has been steadily increasing. Of particular importance is the question of the repetition rate scalability of such sources: on the one hand, applications like XUV frequency comb spectroscopy and attosecond nanoscopy would tremendously profit from efficient HHG at > 100 MHz. On the other hand, at these rates, the HHG interaction volume can neither be replenished with neutral atoms, nor can ionized atoms recombine in the ground state. Fundamental understanding of cumulative effects in HHG is crucial for MHz-HHG applications.
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