@article {rivas_propagation-enhanced_2018,
	title = {Propagation-enhanced generation of intense high-harmonic continua in the 100-eV spectral region},
	journal = {Optica},
	volume = {5},
	number = {10},
	year = {2018},
	pages = {1283{\textendash}1289},
	abstract = {The study of core electron dynamics through nonlinear spectroscopy requires intense isolated attosecond extreme ultraviolet or even X-ray pulses. A robust way to produce these pulses is high-harmonic generation (HHG) in a gas medium. However, the energy upscaling of the process depends on a very demanding next-generation laser technology that provides multi-terawatt (TW) laser pulses with few-optical-cycle duration and controlled electric field. Here, we revisit the HHG process driven by 16-TW sub-two-cycle laser pulses to reach high intensity in the 100-eV spectral region and beyond. We show that the combination of above barrier-suppression intensity with a long generation medium significantly enhances the isolation of attosecond pulses compared to lower intensities and/or shorter media and this way reduces the pulse duration as well as field-stability requirements on the laser driver. This novel regime facilitates the real-time observation of electron dynamics at the attosecond timescale in atoms, molecules, and solids.},
	keywords = {Attosecond pulses, electric fields, Free electron lasers, Nonlinear spectroscopy, Phase matching, Ultraviolet radiation},
	issn = {2334-2536},
	doi = {10.1364/OPTICA.5.001283},
	url = {https://www.osapublishing.org/optica/abstract.cfm?uri=optica-5-10-1283},
	author = {Rivas, D. E. and Major, B. and Weidman, M. and Helml, W. and Marcus, G. and Kienberger, R. and Charalambidis, D. and Tzallas, P. and Balogh, E. and Kov{\'a}cs, K. and Tosa, V. and Bergues, B. and Varj{\'u}, K. and Veisz, L.}
}
