Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 61: Ultrashort Laser Pulses: Applications IV

Q 61.1: Talk

Friday, March 12, 2010, 10:30–10:45, F 342

Full control over the electric field using four liquid crystal arrays — •Fabian Weise and Albrecht Lindinger — Institut für Experimentalphysik, Freie Universität Berlin, Arnimalle 14, 14195 Berlin

Femtosecond pulse shaping is a very powerful technique and has already been successfully applied to a wide range of Systems. Extending the capability of phase and/or amplitude shaping to the modulation of the polarization, the pulses took account of the three dimensionality of physical systems. This results in larger optimization factors and a better understanding of the induced processes.

Initially, we will discuss different concepts of femtosecond polarization shaping and their experimental implementation. Then, we introduce a new setup for pulse shaping which enables us to simultaneously and independently modulate the three parameters phase, amplitude, and polarization [1]. This setup uses four liquid crystal arrays for the modulation and therefore it is able to produce any desired pulse shape with arbitrary polarization states.

Furthermore, we present an analytical approach where the pulse parameters distance, energy, ellipticity, orientation, phase, and chirps can be independently controlled. This parameterization allows to design a sequence of pulses in which the parameters of each sub-pulse can be individually set. Experimentally measured multi-pulses illustrate this method.

[1] Fabian Weise and Albrecht Lindinger Opt. Lett. 34, 1258-1260 (2009)