Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 5: Posters 1: Novelties in Molecular Physics

MO 5.7: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Optimization of the measurement method of fs pump-probe experiment by compressed sensing — •Daniel Uhl, Lukas Bruder, Marcel Binz, Marcel Mudrich, Aaron LaForge, David Groß, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, Germany

Deducing the spectrum of a fs spectroscopy experiment generally requires sampling the signal in the time domain at a rate that suffices the Shannon-Nyquist-Theorem. This boundary condition can result in very long acquisition times especially in multi-dimensional spectroscopy setups where even more data points are required. Compressed sensing reconstructs a signal by exploiting the sparsity of the signal in the frequency domain and allows for sampling far below the Shannon-Nyquist-Theorem in the time domain, while yielding the same information content. In view of combining this method with 2D spectroscopy we are investigating at first its applicability to fs pump-probe spectroscopy. We have investigated quantum beat spectra of atomic vapors and a simple diatomic molecule by analyzing simulated as well as experimental data with this method.