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Kiel 2011 – wissenschaftliches Programm

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K: Fachverband Kurzzeitphysik

K 5: Laserstrahlwechselwirkung, Lasermaterialbearbeitung I

K 5.5: Vortrag

Mittwoch, 30. März 2011, 12:15–12:30, HS D

Dynamics of free electron plasma produced by shaped ultrashort laser pulsesCristian Sarpe, Jens Köhler, •Nadine Götte, Jutta Mildner, Dirk Otto, Matthias Wollenhaupt, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, Heinrich-Plett-Str. 40, D-34132 Kassel, Germany

The first step in the process of laser ablation of dielectric materials is the laser induced optical breakdown in which high density free electron plasma is created. A better knowledge of the plasma dynamics [1] can contribute to increase the precision of the ablation process and to reduce the collateral damage. We have shown that tailored ultrashort laser pulses are suitable to increase the precision of ablation one magnitude order below the optical diffraction limit in the case of high band gap solid dielectrics [2, 3]. Here we present our studies to investigate the dynamics of free electron plasma created by shaped femtosecond pulses in a thin water jet by using a robust spectral interference technique. The phase shift between a reference and a probe pulse produced in common-path interferometer give accurate information about the density of free electron plasma. The temporal evolution of the plasma is accurately observed and its dependence on the laser intensity and temporal pulse shapes is analysed.

[1] C. Sarpe 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)

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