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Journal Articles New Journal of Physics Year : 2013

Spectral characterization of fully phase-matched high harmonics generated in a hollow waveguide for free-electron laser seeding

Abstract

We present a bright and coherent soft x-ray source based on high harmonic generation delivering up to 1010 photons per second centered at 120 eV within an 80 eV bandwidth. The source profits from fully phase-matched harmonic generation in an unmodulated hollow waveguide. Under these conditions, the resulting high harmonic spectrum is shown to be flat-top up to the cutoff photon energy and in line with the theoretical single-atom response. The source is characterized in view of seeding a free-electron laser and is shown to overcome the free-electron laser noise floor for wavelengths as short as 8.9 nm. This opens the perspective toward direct high harmonic seeding of a free-electron laser at soft x-ray wavelengths.

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hal-01163769 , version 1 (15-06-2015)

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Fernando Ardana-Lamas, Guillaume Lambert, Alexandre Trisorio, Boris Vodungbo, Victor Malka, et al.. Spectral characterization of fully phase-matched high harmonics generated in a hollow waveguide for free-electron laser seeding. New Journal of Physics, 2013, 15 (7), pp.073040. ⟨10.1088/1367-2630/15/7/073040⟩. ⟨hal-01163769⟩
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