https://doi.org/10.1140/epjs/s11734-022-00671-x
Regular Article
A Raman-delayed nonlinearity for elliptically polarized ultrashort optical pulses
1
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
a
alexandre.stathopulos@cea.fr
Received:
18
May
2022
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.
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