On the possibility of suppression of self-focusing of a femtosecond laser pulse during its propagation in a cubic nonlinear medium |
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Authors: | A G Volkov and V A Trofimov |
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Institution: | (1) Lomonosov Moscow State University, Moscow, 119991, Russia |
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Abstract: | Based on a computer simulation, the self-focusing of an axially symmetric beam in a cubic nonlinear medium under the anomalous dispersion conditions is studied with the account for the time dispersion of nonlinear response, which manifests for femtosecond pulses. It is shown that, at a certain value of the parameter of linear modulation of the pulse (or of its chirp), the dispersion of nonlinear response can lead either to the suppression of formation of a nonlinear focus and to the possibility of formation of optical shock waves in time or even to a change in the regime of the beam self-action owing to the action of the local response, i.e., to the change from the self-focusing of the beam to the regime of its defocusing. |
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