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A table-top ultrashort light source in the extreme ultraviolet for circular dichroism experiments

A. Ferré 1 C. Handschin 1 M. Dumergue 1 F. Burgy 1 A. Comby 1 D. Descamps 1 B. Fabre 1 G. A. Garcia 2 R. Géneaux 3, 4, 5 L. Merceron 1 E. MÉvel 1 L. Nahon 2 S. Petit 1 David Staedter 6 Sébastien J. Weber 3, 4 T. Ruchon 3, 4 B. Pons 1 Valérie Blanchet 1 Y. Mairesse 1, 4
4 ATTO - Attophysique
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
5 DICO - Biomolécules Excitées
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
6 Femto (LCAR)
LCAR - Laboratoire Collisions Agrégats Réactivité
Abstract : Circular dichroism in the extreme ultraviolet range is broadly used as a sensitive structural probe of matter, from the molecular photoionization of chiral species1, 2, 3 to the magnetic properties of solids4. Extending such techniques to the dynamical regime has been a long-standing quest of solid-state physics and physical chemistry, and was only achieved very recently5 thanks to the development of femtosecond circular extreme ultraviolet sources. Only a few large facilities, such as femtosliced synchrotrons6, 7 or free-electron lasers8, are currently able to produce such pulses. Here, we propose a new compact and accessible alternative solution: resonant high-order harmonic generation of an elliptical laser pulse. We show that this process, based on a simple optical set-up, delivers bright, coherent, ultrashort, quasi-circular pulses in the extreme ultraviolet. We use this source to measure photoelectron circular dichroism on chiral molecules, opening the route to table-top time-resolved femtosecond and attosecond chiroptical experiments.
Keywords : ultrashort
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Submitted on : Monday, March 30, 2015 - 10:37:44 AM
Last modification on : Tuesday, April 5, 2022 - 3:15:47 AM

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A. Ferré, C. Handschin, M. Dumergue, F. Burgy, A. Comby, et al.. A table-top ultrashort light source in the extreme ultraviolet for circular dichroism experiments. Nature Photonics, Nature Publishing Group, 2015, 9 (2), pp.93-98. ⟨10.1038/nphoton.2014.314⟩. ⟨hal-01136940⟩

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