Berlin 2005 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 39: Nichtlineare optische Effekte & Lichtquellen

Q 39.6: Vortrag

Dienstag, 8. März 2005, 12:00–12:15, HU 2014a

Self-focusing of ultrashort intense laser pulses in gases: A variational analysis of the nonlinear Schrödinger equation — •E. Arevalo and A. Becker — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden

We investigate the process of self-focusing of an ultrashort intense laser pulse in gas medium. To this end, we use the self-similarity assumption of the electric field envelope together with a phase correction. In the latter we take into account the low-intensity background part of the pulse via perturbation theory. The ansatz is used as a trial solution in a variational method and solutions for the width, intensity and self-focusing distance of the pulse are derived. The results are in good agreement with numerical solutions over a broad range of input powers and show the important influence of the low-intensity background of the pulse on its propagation dynamics.