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Communication Dans Un Congrès Année : 2017

Higher Order Kerr Terms vs. Plasma: Saturation of the Nonlinear Refractive Index

Résumé

In this talk, I will present a study on atomic nonlinear polarization induced by high-intensity ultrashort laser pulses in hydrogen by numerically solving the time-dependent Schrodinger equation. The aim is to reveal the origin of the nonlinear index saturation and subsequent intensity clamping in femtosecond _laments. This allows for the comparison between the proposed model of the higher-order Kerr effect (HOKE) and two versions of the standard model for femtosecond _lamentation, including either a multiphoton or tunnel ionization rate. We find that around the clamping intensity the instantaneous HOKE model does not reproduce the temporal structure of the nonlinear response obtained from the quantum-mechanical results. In contrast, the noninstantaneous charge contributions included in the standard models ensure a reasonable quantitative agreement. Therefore, the physical origin for the observed saturation of the overall electron response is confirmed to mainly result from contributions of free or nearly-free electrons.
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Dates et versions

hal-01739607 , version 1 (21-03-2018)

Identifiants

  • HAL Id : hal-01739607 , version 1

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Roland Guichard, Christian Koehler, Luc Bergé, E Lorin, S. Chelkowski, et al.. Higher Order Kerr Terms vs. Plasma: Saturation of the Nonlinear Refractive Index. Computational Plasma Physics Conference, Nov 2017, York, United Kingdom. ⟨hal-01739607⟩
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