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Q: Quantenoptik
Q 10: Poster: Nonlinear Optics
Q 10.17: Poster
Tuesday, April 3, 2001, 12:30–15:00, AT2
Self- focusing and defocusing in sub-picosecond pulses interaction with dielectrics and laser-induced breakdown — •O. Fedotova1, T. Smirnova1, B. Rethfeld2, O. Khasanov1, K. Sokolowski-Tinten2, and D. von der Linde2 — 1Institute of Solid State & Semiconductor Physics, 17 Brovki str., Minsk 220072, Belarus — 2Institut für Laser and Plasmaphysik, Universität Essen, Germany
The non-resonant interaction of high-power femtosecond laser pulses with a
Kerr dielectric medium is investigated.
The necessity of solving the self-consistent problem for the evolution of
both,
the pulse field and the medium is shown. The change of the refraction
index leads to self-focusing in the medium due to normal (Kerr)
dispersion. However, if ionization processes
contribute, plasma induced defocusing needs to be included. We compare the
results of numerical modelling with experiments. In particular, we will
discuss possible reasons for the absence of laser-induced breakdown in
bulk
media, as observed experimentally [1].
[1] D. von der Linde and H. Schüler, Breakdown Threshold and Plasma Formation
in Femtosecond Laser-Solid Interaction, J. Opt. Soc. Am. B 13,
pp.216-222 (1996)