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

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.
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https://hal-cea.archives-ouvertes.fr/cea-01244396
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Submitted on : Tuesday, December 15, 2015 - 4:41:38 PM
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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, 2014, 9, pp. 93-98. ⟨10.1038/nphoton.2014.314⟩. ⟨cea-01244396⟩

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