High-order harmonic generation in an active grating

We study theoretically and experimentally high-order harmonic generation (HHG) using two noncollinear driving fields focused in gases. We show that these two fields form a nonstationary blazed active grating in the generation medium. The intensity and phase structure of this grating rule the far-fie...

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Bibliographic Details
Published in:Physical review. A 2019-03, Vol.99 (3), Article 033806
Main Authors: Chappuis, C., Bresteau, D., Auguste, T., Gobert, O., Ruchon, T.
Format: Article
Language:English
Subjects:
Mechanics
Mechanics of materials
Physics
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Summary:We study theoretically and experimentally high-order harmonic generation (HHG) using two noncollinear driving fields focused in gases. We show that these two fields form a nonstationary blazed active grating in the generation medium. The intensity and phase structure of this grating rule the far-field properties of the emission, such as the relative amplitude of the diffraction orders. Full macroscopic calculations and experiments support this wave-based picture of the process, complementing and extending its standard “photon” picture. This insight into the HHG process allows us to envision structuration schemes to convert femtosecond lasers to attosecond pulses with increased efficiency.
ISSN:2469-9926
1050-2947
2469-9934
1094-1622
DOI:10.1103/PhysRevA.99.033806