Osnabrück 2002 – wissenschaftliches Programm
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Q: Quantenoptik
Q 302: Poster: Nichlineare Optik
Q 302.5: Poster
Mittwoch, 6. März 2002, 11:00–13:00, Schloss
Spatio-temporal dynamics of femtosecond pulses in bulk dielectrics — •Tatiana Smirnova1, Olga Fedotova1, Baerbel Rethfeld2, Vasily Temnov2, Oleg Khasanov1, Klaus Sokolowski-Tinten2, Ping Zhou2, and Dietrich von der Linde2 — 1Institut fuer Festkoerper- und Halbleiterphysik, Weissruss. Nat. Academie der Wissenschaften, 17 P.Brovka Str., Minsk 220072 Belarus — 2Institut fuer Laser- und Plasmaphysik, Universitaet Essen, Universitaetstr. 5 , Essen D-45117
We investigate the processes occurring when intense femtosecond laser pulses are focused into bulk dielectric materials. (2+1)-D non-linear Schroedinger equation is analyzed taking into account group velocity dispersion, diffraction, and the polarization change due to non-linear refractive index change, as well as multiphoton absorption and plasma formation. The split-step method on 3-D grid and Crank-Nickolson scheme are used to realize the solution. The asymmetrical pulse splitting character is analyzed in dependence on the sample thickness, the input beam power, the self-focusing threshold, and the group velocity dispersion. Some open questions concerning the femtosecond laser-induced breakdown are discussed. The results of numerical modelling are compared with experimental data provided by time-resolved optical interferometry.