Darmstadt 2008 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 26: Poster Ultrakurze Laserpulse

Q 26.6: Poster

Dienstag, 11. März 2008, 16:30–19:00, Poster C1

Compensation of undesired amplitude and phase effects in polarization pulse shaping — •Jens Köhler, Marc Krug, Cristian Sarpe-Tudoran, Matthias Wollenhaupt, and Thomas Baumert — Universität Kassel, Institut für Physik und Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Heinrich-Plett-Str. 40, D-34132 Kassel, Germany

Undesired polarization dependent amplitude modulations and phase shifts are of great importance in femtosecond polarization pulse shaping. These effects are introduced by components of the pulse shaper itself as well as additional optical elements. For accurate generation of pulses with a desired time-dependent polarization profile on an ultrashort timescale it is important to understand and to control these effects. Here we present two approaches allowing for the compensation of these disturbing factors. Using VPHGs (Volume Phase Holographic Gratings) the polarization dependent losses normally present in polarization pulse shapers could be minimized. The phase shifts can be handled by the use of an appropriate retardation plate. Femtosecond laser pulses with different polarization states were generated with our high-resolution polarization pulse shaper based on a 2x640 pixel LC-SLM (Liquid Crystal-Spatial Light Modulator). The shaped pulses were analyzed using a simple optical scheme and employing PEIS (Photoelectron Imaging Spectroscopy). First results demonstrating the successful compensation of the above mentioned amplitude and phase effects are presented.