Journal
NATURE PHOTONICS
Volume 9, Issue 2, Pages 93-98Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2014.314
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Funding
- Conseil Regional d'Aquitaine [20091304003, 2.1.3-09010502]
- l'Agence Nationale pour la Recherche [ANR-14-CE32-0014, ANR-14-CE32-0010]
- European Union (Laserlab-Europe II) [228334, EU-FP7 284464]
- RTRA Triangle de la Physique (Attocontrol)
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Circular dichroism in the extreme ultraviolet range is broadly used as a sensitive structural probe of matter, from the molecular photoionization of chiral species(1-3) to the magnetic properties of solids(4). 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 recently(5) thanks to the development of femtosecond circular extreme ultraviolet sources. Only a few large facilities, such as femto-sliced synchrotrons(6,7) or free-electron lasers(8), 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.
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