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Communication Dans Un Congrès Année : 2017

Suitability of the unidirectional approach for describing laser-driven terahertz emission

Résumé

Over the past decade, the increasing potential of terahertz (THz) radiation has stimulated intensive efforts to develop efficient emitters based on the ionization of gases by ultrashort laser pulses [1]. In order to properly calibrate dedicated experiments, nonlinear propagation codes have to be particularly accurate to describe the low-frequency part of the pulse spectrum. Usually, solving full Maxwell models accounting for multiple ionization processes as well as optical and plasma nonlinear effects is computationally expensive when simulating long propagation ranges. Therefore, reduced models such as the Unidirectional Pulse Propagation Equation (uppe) [2] are often preferred, assuming that the forward propagating component conveys the major part of the laser energy. So far, no detailed numerical comparison has been performed to confirm the validity of this uppe approach, which is widely used in the scope of laser-driven THz generation [3]. Here, we examine by means of 1D simulations the differences occurring in the THz pulse spectra and fields when these quantities are described either by a full Maxwell-fluid (maxflu) model, encompassing both backward and forward propagations, or by its uppe approximation, modeling only the forward propagating wave.
Dechard et al. - 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEOEurope-EQEC) - 2017.pdf (103.36 Ko) Télécharger le fichier
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Dates et versions

hal-01671285 , version 1 (22-12-2017)

Identifiants

Citer

J Déchard, P González de Alaiza Martínez, A Nguyen, I Thiele, Stefan Skupin, et al.. Suitability of the unidirectional approach for describing laser-driven terahertz emission. Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC, 2017 Conference on), Jun 2017, Munich, Germany. ⟨10.1109/CLEOE-EQEC.2017.8087725⟩. ⟨hal-01671285⟩
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