Towards enabling femtosecond helicity-dependent spectroscopy with high-harmonic sources

G. Lambert (), B. Vodungbo, J. Gautier, B. Mahieu, V. Malka, S. Sebban, P. Zeitoun, J. Luning, J. Perron, A. Andreev, S. Stremoukhov, F. Ardana-Lamas, A. Dax, C. P. Hauri, A. Sardinha and M. Fajardo
Additional contact information
G. Lambert: LOA, UMR 7639, ENSTA-ParisTech, CNRS, Ecole Polytechnique, Chemin de la Hunière
B. Vodungbo: LOA, UMR 7639, ENSTA-ParisTech, CNRS, Ecole Polytechnique, Chemin de la Hunière
J. Gautier: LOA, UMR 7639, ENSTA-ParisTech, CNRS, Ecole Polytechnique, Chemin de la Hunière
B. Mahieu: LOA, UMR 7639, ENSTA-ParisTech, CNRS, Ecole Polytechnique, Chemin de la Hunière
V. Malka: LOA, UMR 7639, ENSTA-ParisTech, CNRS, Ecole Polytechnique, Chemin de la Hunière
S. Sebban: LOA, UMR 7639, ENSTA-ParisTech, CNRS, Ecole Polytechnique, Chemin de la Hunière
P. Zeitoun: LOA, UMR 7639, ENSTA-ParisTech, CNRS, Ecole Polytechnique, Chemin de la Hunière
J. Luning: Sorbonne Universités, UPMC Paris 06, UMR 7614, LCPMR
J. Perron: Sorbonne Universités, UPMC Paris 06, UMR 7614, LCPMR
A. Andreev: Faculty of Physics, Lomonosov Moscow State University
S. Stremoukhov: Faculty of Physics, Lomonosov Moscow State University
F. Ardana-Lamas: Paul Scherrer Institute, SwissFEL
A. Dax: Ecole Polytechnique Fédérale de Lausanne
C. P. Hauri: Paul Scherrer Institute, SwissFEL
A. Sardinha: LOA, UMR 7639, ENSTA-ParisTech, CNRS, Ecole Polytechnique, Chemin de la Hunière
M. Fajardo: GoLP, Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Recent advances in high-harmonic generation gave rise to soft X-ray pulses with higher intensity, shorter duration and higher photon energy. One of the remaining shortages of this source is its restriction to linear polarization, since the yield of generation of elliptically polarized high harmonics has been low so far. We here show how this limitation is overcome by using a cross-polarized two-colour laser field. With this simple technique, we reach high degrees of ellipticity (up to 75%) with efficiencies similar to classically generated linearly polarized harmonics. To demonstrate these features and to prove the capacity of our source for applications, we measure the X-ray magnetic circular dichroism (XMCD) effect of nickel at the M2,3 absorption edge around 67 eV. There results open up the way towards femtosecond time-resolved experiments using high harmonics exploiting the powerful element-sensitive XMCD effect and resolving the ultrafast magnetization dynamics of individual components in complex materials.

Date: 2015
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DOI: 10.1038/ncomms7167

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