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MO: Fachverband Molekülphysik

MO 19: Poster 2: Biomolecules, Cold Molecules, Experimental Techniques, Various Topics

MO 19.28: Poster

Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof

Numerical optimization of excitation spectra for fast Singlebeam- CARS imaging — •Alexander Wipfler, Jean Rehbinder, Tiago Buckup, and Marcus Motzkus — Physikalisch- Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg, Germany

Coherent control schemes can be adapted to fast chemical selective imaging by applying phases to the excitation field that enhance the CARS signal for one constituent while suppressing all others. To determine these phases it is advantageous and sometimes necessary to use numeric simulations of the CARS process. We present a simulation tool based on LabVIEW that calculates entire single-beam-CARS spectra in the order of a few microseconds and enables the use of genetic algorithms for optimization. As input from the experiment the laser spectrum and the nonlinear susceptibility of the probed molecules are needed. The first one is easily measured and the second one can be determined by a method relying on the use of a local oscillator field which is intrinsically generated in single-beam-CARS measurements.[1] Therefore a complete calculation scheme is present allowing for the determination of optimal phase functions for fast imaging.
Wipfler et al. Opt. Lett., 2012. 37(20): p. 4239-4241.