Controlling high harmonics generation by spatial shaping of high-energy femtosecond beam

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/231219

Title: Controlling high harmonics generation by spatial shaping of high-energy femtosecond beam
Author(s): Dubrouil, A.; Mairesse, Y.; Fabre, B.; Descamps, D.; Petit, S.; Mevel, E.; Constant, E.
Abstract: We demonstrate controlled high-order harmonic generation in gas using high-energy femtosecond pulses (50 fs. - 50 mJ on target) by performing spatial shaping of the terrawatt fundamental laser beam. We have developed a two optical paths mirror that can withstand high power and shape the pump beam into a quasi-flat-top profile (super Gaussian) near focus. We observe clear signatures of the spatial shaping on the harmonic beam in terms of profile, divergence, level of signal, and spectrum. The harmonic generation in neon with a quasi-flat-top beam results in a broadband extreme UV beam with extremely low divergence (~340 μrad).
Publication type: Journal article
Source: Optics Letters, Vol. 36, no. 13 (Jul 2011), pp. 2486-2488
Publication year: 2011
FOR Code(s): 0205 Optical Physics; 0206 Quantum Physics; 0906 Electrical and Electronic Engineering
Keyword(s): Electromagnetic pulse; Extreme UV; Femtosecond beams; Gaussian beams; Harmonic beams; Harmonic analysis; Harmonic generation; High harmonics; High order harmonic generation; High-power; Low divergence; Neon; Optical path; Pump beams; Super-Gaussian
Publisher: Optical Society of America
ISSN: 0146-9592
Publisher URL: http://dx.doi.org/10.1364/ol.36.002486
Peer reviewed