Hyper-Raman lines emission concomitant with high-order harmonic generation

Hyper-Raman lines (HRL) resulting from strong-field light-matter interaction have been predicted theoretically in the 1990s but never identified in high-order harmonic generation experiments. Here, we use a combination of 800 and 400 nm laser pulses to control independently the two processes require...

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Bibliographic Details
Published in:New journal of physics 2019-07, Vol.21 (7), p.73006
Main Authors: Bloch, Etienne, Beaulieu, Samuel, Descamps, Dominique, Petit, Stéphane, Légaré, François, Magunov, Alexander, Mairesse, Yann, Strelkov, Vasily
Format: Article
Language:English
Subjects:
Chemical Physics
Electron states
Emission analysis
Excitation spectra
Harmonic generations
high-order harmonic generation
hyper-Raman lines
nonlinear optics
Optics
Physics
strong field physics
ultrafast spectroscopy
XUV free induction decay
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Summary:Hyper-Raman lines (HRL) resulting from strong-field light-matter interaction have been predicted theoretically in the 1990s but never identified in high-order harmonic generation experiments. Here, we use a combination of 800 and 400 nm laser pulses to control independently the two processes required for the hyper-Raman emission: creation of a coherence between two electronic states and laser-dressing of these states. As a result we observe simultaneously high-order harmonics, XUV free induction decay and HRL. We investigate experimentally and numerically the properties of this novel emission source. It can be of high interest, amongst others, for high-resolution spatio-temporal spectroscopy of excited electronic states in the same fashion high-order harmonics generation provides it for ground state.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ab28b9