Article Dans Une Revue The European Physical Journal. Special Topics Année : 2023

A Raman-delayed nonlinearity for elliptically polarized ultrashort optical pulses

Résumé

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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hal-03872394 , version 1 (25-11-2022)

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Alexandre Stathopulos, Stefan Skupin, Luc Bergé. A Raman-delayed nonlinearity for elliptically polarized ultrashort optical pulses. The European Physical Journal. Special Topics, 2023, 232 (13), pp.2285-2292. ⟨10.1140/epjs/s11734-022-00671-x⟩. ⟨hal-03872394⟩
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