Abstract
High-harmonic generation (HHG), where a short-pulse high-power laser ionises a gas which upon recombination emits high energy radiation, is an exciting option for table-top sources of coherent X-rays and XUV light for imaging and spectroscopy. Traditionally, the pump lasers have been femtosecond Ti:Sapphire lasers. As more high-power ultrafast pump laser systems are becoming commercially available, for example fibre lasers and wavelength shifted systems based on OPAs, it is important to understand how their different operating regimes (wavelength, pulse length, peak power, repetition rate) affect HHG efficiency and flux.
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