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

We present a bright and coherent soft x-ray source based on high harmonic generation delivering up to 10(10) 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.


Published in:
New Journal of Physics, 15, 7, 073040
Year:
2013
Publisher:
Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft
ISSN:
1367-2630
Laboratories:




 Record created 2015-03-12, last modified 2018-03-18


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