Open Access
UVX 2008
UVX 2008 - 9e Colloque sur les Sources Cohérentes et Incohérentes UV, VUV et X ; Applications et Développements Récents
Page(s) 107 - 111
Publié en ligne 7 juillet 2009
UVX 2008 (2009) 107-111
DOI: 10.1051/uvx/2009017

High-contrast pump-probe spectroscopy with high-order harmonics

Y. Mairesse1, W. Boutu2, P. Breger2, E. Constant1, D. Descamps1, N. Dudovich3, B. Fabre1, S. Haessler2, J. Higuet1, E. Mével1, S. Petit1, P. Salières2, D.M. Villeneuve4 and P.B. Corkum4

1  CELIA, Université Bordeaux I, UMR 5107 (CNRS, Bordeaux 1, CEA), 351 cours de la Libération, 33405 Talence Cedex, France
2  CEA-Saclay, DSM, Service des Photons, Atomes et Molécules, 91191 Gif-sur-Yvette, France
3  Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel
4  Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada

Published online: 7 July 2009

The high order harmonic generation process from molecules can be used to probe the structure of the emitting medium with high spatial resolution [1, 2]. The measurements of molecular dynamics with such a probe is thus very appealing. Contrast is an important issue in pump probe spectroscopy: in general the probe only excites part of the molecules, so that the detected signal can be dominated by contributions from non-excited molecules. In this article we review two techniques that can be used to enhance the contrast of pump probe measurements: transient grating spectroscopy and polarization-resolved spectroscopy. We use these techniques to detect rotational wavepackets and demonstrate a dramatic improvement in the contrast of the measured signal.

© EDP Sciences 2009

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