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Journal Article

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


Beaulieu,  Samuel
Université de Bordeaux—CNRS—CEA, CELIA, UMR5107;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
ALLS, Institut National de la Recherche Scientifique, Centre EMT;

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Bloch, E., Beaulieu, S., Descamps, D., Petit, S., Légaré, F., Magunov, A., et al. (2019). Hyper-Raman lines emission concomitant with high-order harmonic generation. New Journal of Physics, 21(7): 073006. doi:10.1088/1367-2630/ab28b9.

Cite as: https://hdl.handle.net/21.11116/0000-0004-7491-5
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.