A Raman-delayed nonlinearity for elliptically polarized ultrashort optical pulses
CEA, DAM, DIF, 91297, Arpajon, France
2 Université Paris-Saclay, CEA, LMCE, 91680, Bruyères-le-Châtel, France
3 Institut Lumière Matière, UMR 5306 Université Lyon 1-CNRS, Université de Lyon, 69622, Villeurbanne, France
Accepted: 20 September 2022
Published online: 21 November 2022
We address the role of the delayed Kerr nonlinearity associated with stimulated rotational Raman scattering on the propagation of intense ultrashort two-color filaments with elliptical polarization in gases and examine its impact on the generation of optical frequencies as well as terahertz frequencies. We find that in air the nonlinearity associated with stimulated Raman scattering strongly impacts the dynamics of the laser filaments and modifies the overall pulse spectral content. In particular, it alters the THz spectra upon propagation in the filamentation regime. Differences between linearly and circularly polarized two-color pump pulses are discussed.
© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.