Hannover 2016 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Posters 3: Novelties in Molecular Physics: Theory of Molecular Dynamics, Collisions and Energy Transfer, and Experimental Techniques

MO 14.18: Poster

Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof

Spectral focusing with flexible shaped laser pulses for chemical imaging — •Lukas Brückner, Tiago Buckup, and Marcus Motzkus — Physikalisch-Chemisches Institut, Universität Heidelberg, Germany

Due to the high degree of control, the implementation of spectral focusing into a single-beam CARS setup containing a pulse shaper has several advantages over usual multi-beam setups and opens up new possibilities. We show in simulation and experiment how the flexible adjustment of the spectral focusing phase makes it possible to address and optimize multiple important parameters for imaging and microspectroscopy. The effect of the applied chirp on the spectral resolution and the possibility of dividing the spectrum into pump, Stokes and probe frequencies in order to allow for time-delaying the probe for background-free imaging are shown. In addition, their amplitudes can be independently adjusted and certain spectral regions completely suppressed to prevent biological samples from photo damage. The possibility of using a transform-limited probe also greatly increases the signal levels of simultaneously detected SHG and TPEF-signals in multimodal imaging. Furthermore, the applicability of the concept to a broad spectral range from the fingerprint region to the CH-vibrations around 3000 wavenumbers is shown

[1] J. Rehbinder, L. Brückner, A. Wipfler, T. Buckup, and M. Motzkus, Opt. Express 22, 28790 (2014)

[2] L. Brückner, T. Buckup and M. Motzkus, Opt. Lett. 22, 5204-5207 (2015)