Greifswald 2009 – wissenschaftliches Programm

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K: Fachverband Kurzzeitphysik

K 11: Poster

K 11.4: Poster

Dienstag, 31. März 2009, 17:30–19:30, Foyer des IfP

Dynamics of free electron plasma produced by shaped femtosecond laser pulses in water — Cristian Sarpe-Tudoran, Matthias Wollenhaupt, Alexander Horn, •Lars Englert, Jens Köhler, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, Heinrich-Plett-Str. 40, D-34132 Kassel, Germany

The generation of high density free electron plasma is the first step in the laser induced optical breakdown process; a better knowledge of the plasma dynamics [1] can contribute to increase the precision of the ablation process and to reduce the collateral damage. Recently we have shown that tailored ultrashort laser pulses are suitable for robust manipulation of optical breakdown in the case of high band-gap solid dielectrics [2, 3]. In this contribution we report our studies to investigate the free electron plasma evolution produced by shaped femtosecond laser pulses in a thin water jet. By using a spectral interferometric technique the early times dynamics is observed with a high temporal resolution and the dependence of the free electron density on laser intensity and temporal pulse shapes is accurately obtained.

[1] C. Sarpe-Tudoran et al. Appl. Phy. Lett. 88, 2161109 (2006)

[2] L. Englert et al. Opt. Express 15, 17855 (2007)

[3] L. Englert et al. Appl Phys A 92, 749 (2008)