Abstract
Extension of High order Harmonics Generation (HHG) towards XUV and up to soft-x-rays relies on the development of driving sources with specific properties: mid-infrared wavelength, few-cycle pulse duration, high peak intensity, carrier-envelope phase stability and control, high energy and/or high-repetition rate. While longer wavelengths of the driving source extend the HHG cutoff energy through the λ2 dependency of the ponderomotive energy, shorter pulses lead to the higher peak intensities enhancing the HHG conversion yield and extending HHG cutoff energy even further. Additionally, few-cycle driving pulses reduce the number of produced attosecond bursts up to, ideally, a single isolated attosecond pulse. In this case, CEP stability and control is paramount for ensuring optimization and shot-to-shot reproducibility of the HHG yield and spectra.
© 2017 IEEE
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