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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster Ultrakurze Lichtimpulse

Q 29.7: Poster

Dienstag, 20. März 2007, 16:30–18:30, Poster C

Adaptive spatiotemporal control of laser-pulses using a high-resolution LCD pulse-shaper — Dominik Walter, Stefan Eyring, Jan Lohbreier, Robert Spitzenpfeil, Matthias Weger, •Sebastian Jung, Nico Franke, and Christian Spielmann — Physikalisches Institut, Universität Würzburg

We demonstrate adaptive spatiotemporal control of laser pulses using a 2D programmable phase modulator (Hamamatsu X8267). Our approach takes advantage of the full resolution of the active area while simultaneously reducing the problem to a limited set of free parameters. This becomes particularly important for pulse optimizations using evolutionary algorithms where the initially huge parameter set has to be reduced significantly. The simplification is achieved by dividing the active area of the 2D phase modulator into quadratic regions whose pixels are combined and represented by tilted planes. Pulse distortions introduced by the pulse shaper can be avoided by realization of a smooth phase surface at the edges of each pixel-plane. We show results that demonstrate successful implementation of our experimental setup and an evolutionary algorithm to both spatially and temporally optimize Ti:sapphire laser pulses close to the bandwidth limit.