Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 5: Posters 1: Electronic Spectroscopy, Photochemistry, Femtosecond Spectroscopy

MO 5.19: Poster

Montag, 17. März 2014, 16:30–18:30, Spree-Palais

Strong-field control of population transfer in laser dyes with designed femtosecond laser pulses — •Tillmann Kalas¹, Tobias Blumenstein¹, Johannes Schneider¹, Matthias Wollenhaupt², and Thomas Baumert¹ — ¹Universität Kassel, Institut für Physik und CINSaT — ²Universität Oldenburg, Institut für Physik

We present control of the population transfer in commercially available laser dyes by resonant strong-field excitation with shaped near infrared femtosecond laser pulses. Working in the singlet system of the laser dyes, we investigate population control mechanisms discovered earlier in the triplet system of photosensitizer dyes [1] using our high precision pulse shaper [2].
To that end we record control landscapes with respect to the fluorescence intensity of the dyes by a systematic variation of laser pulse shapes combining second order and third order dispersion. In the strong-field regime, we find highly structured topologies with large areas of maximum or minimum population transfer. Furthermore, we compare our experimental results with simulations on generic molecular potentials by solving the TDSE for excitation with shaped pulses. We discuss our findings with respect to our previous work and the therein discovered control mechanisms. Within this context, we give an outlook on the application of strong field controlled fluorescence in the research field of nonlinear microscopy.

[1] J. Schneider et al.: Phys. Chem. Chem. Phys., 13, 8733(2011)

[2] J. Köhler et al.: Opt. Express, 19(12), 11638(2011)