Darmstadt 2008 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 26: Poster Ultrakurze Laserpulse

Q 26.3: Poster

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

Specially parameterized evolutionary algorithm for spatial optimization — •Jan Lohbreier, Stefan Eyring, Christian Kern, Robert Spitzenpfeil, Dominik Walter, and Christian Spielmann — Universität Würzburg, Physikalisches Institut, Am Hubland, 97074 Würzburg

We present a method to achieve an optimal spatial phase shape for a femtosecond laser pulse via an evolutionary algorithm. 'Optimal' here is meant to be specifically designed for one signal (e.g. overall intensity as fitness) that is fed back to the computer. The 768x768 pixels of our pulse shaper allow high-resolution phase shaping but also need a lot of computing power for a real-time optimization. Our new approach is to minimize the required informational size of a generation and thus to reduce the computing time per generation. Furthermore the technique to use planes instead of meta-pixels generates a smoother phase mask which is generally preferred to a rough surface. To test this scheme a picture was set to be the ideal phase mask and the time for the algorithm to match the intended picture was measured. Thus it was possible to downsize the controlling environment to make the optimization as good and fast as possible for its current challenges.