Simulation of the temporal behavior of one single laser pulse in a photorefractive medium

Abstract : This paper presents a numerical modeling of the temporal evolution of the refraction index induced by a nanosecond single laser pulse propagating in a biased photorefractive crystal. Assuming particular hypotheses typical for a short pulse illumination, a nonlinear time dependent partial differential equation, which describes the mechanisms of space–charge field build up and evolution, is derived from a mono-dimensional Kukhtarev band transport model. The numerical resolution of this space–charge equation is then coupled to the simulation of the propagation of a beam in a nonlinear medium using a beam propagation method. The results evidence the spatial self-focusing of a single nanosecond laser pulse. A description of the output beam profile evolution during the laser pulse is obtained and the role of different physical parameters such as the carriers mobility and the fluence on self-focusing is investigated. A successful comparison to previous experimental measurements is reported.
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https://hal.archives-ouvertes.fr/hal-00169001
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Submitted on : Friday, August 31, 2007 - 10:32:20 AM
Last modification on : Thursday, April 5, 2018 - 12:30:20 PM

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Delphine Wolfersberger, Frédéric Lhommé, Nicolas Fressengeas, Godefroy Kugel. Simulation of the temporal behavior of one single laser pulse in a photorefractive medium. Optics Communications, Elsevier, 2003, 1-6, pp.383-391. ⟨10.1016/S0030-4018(03)01602-X⟩. ⟨hal-00169001⟩

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