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Theoretical Study: High Harmonic Generation by Light Transients

Department für Physik, Ludwig-Maximilians-Universität München, Am Coulombwall 1, D-85748 Garching, Germany
Max-Planck Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(5), 728;
Received: 11 April 2018 / Revised: 25 April 2018 / Accepted: 2 May 2018 / Published: 5 May 2018
(This article belongs to the Special Issue Extreme Time Scale Photonics)
PDF [5951 KB, uploaded 6 May 2018]


The dynamic of electron densities in matter upon the interaction with an intense, few-cycle electric field of light causes variety of nonlinear phenomena. Capturing the spatiotemporal dynamics of electrons calls for isolated attosecond pulses in the X-ray regime, with sufficient flux to allow for: (i) attosecond pump–attosecond probe spectroscopy; or (ii) four-dimensional imaging. Light field synthesizers generate arbitrary sub-cycle, non-sinusoidal waveforms. They have a great potential to overcome the limitations of current laser sources and to extend attosecond pulses towards the X-ray regime. In this paper, we show theoretically how the achievable high-energy, high-power waveforms from current light field synthesizers can be optimized to enhance the harmonic yield at high photon energies and can serve as a promising source for scaling the photon energies of attosecond pulses. We demonstrate that the simulated optimized, non-sinusoidal waveform in this work can increase the photon flux of keV, attosecond pulses by five orders of magnitude compared to the achievable flux from longer wavelength sources and at similar photon energies. View Full-Text
Keywords: ultrafast nonlinear optics; X-rays; soft X-rays; extreme ultraviolet; ultrafast lasers; ultrafast spectroscopy ultrafast nonlinear optics; X-rays; soft X-rays; extreme ultraviolet; ultrafast lasers; ultrafast spectroscopy

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Wendl, M.; Högner, M.; Fattahi, H. Theoretical Study: High Harmonic Generation by Light Transients. Appl. Sci. 2018, 8, 728.

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