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MO: Fachverband Molekülphysik
MO 19: Poster 2: Biomolecules, Cold Molecules, Experimental Techniques, Various Topics
MO 19.28: Poster
Wednesday, March 20, 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.