Generation of broad XUV continuous high harmonic spectra and isolated attosecond pulses with intense mid-infrared lasers

We present experimental results showing the appearance of a near-continuum in the high-order harmonic generation (HHG) spectra of atomic and molecular species as the driving laser intensity of an infrared pulse increases. Detailed macroscopic simulations reveal that these near-continuum spectra are...

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Bibliographic Details
Published inarXiv.org
Main Authors Trallero-Herrero, C, Jin, C, Schmidt, B E, Shiner, A D, J-C Kieffer, Corkum, P B, Villeneuve, D M, Lin, C D, Légaré, F, A-T, Le
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 04.10.2011
Subjects
Attosecond pulses
Blue shift
Defocusing
Far fields
Harmonic generations
Infrared lasers
Physics - Atomic Physics
Physics - Optics
Spatial filtering
Spectra
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Summary:We present experimental results showing the appearance of a near-continuum in the high-order harmonic generation (HHG) spectra of atomic and molecular species as the driving laser intensity of an infrared pulse increases. Detailed macroscopic simulations reveal that these near-continuum spectra are capable of producing IAPs in the far field if a proper spatial filter is applied. Further, our simulations show that the near-continuum spectra and the IAPs are a product of strong temporal and spatial reshaping (blue shift and defocusing) of the driving field. This offers a possibility of producing IAPs with a broad range of photon energy, including plateau harmonics, by mid-IR laser pulses even without carrier-envelope phase stabilization.
ISSN:2331-8422
DOI:10.48550/arxiv.1110.0865