Hannover 2016 – scientific programme

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MO: Fachverband Molekülphysik

MO 19: Posters 4: Novelties in Molecular Physics: Femtosecond Spectroscopy, Molecular Clusters, Cold Molecules and Helium Droplets

MO 19.2: Poster

Thursday, March 3, 2016, 16:30–19:00, Empore Lichthof

Pump-Probe Experiments in a Collinear Phase Modulation Scheme Using a Low Repetition Rate Laser System — •Marcel Binz, Lukas Bruder, Ulrich Bangert, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, Germany

Recently various active and passive stabilization methods have been developed to facilitate coherent time-resolved spectroscopy in the visible and ultra violet spectral region. Among these, the phase modulation approach of the Marcus group [1] has proven to be particularly sensitive and very versatile. The drawback of this method is however the need of a high repetition rate laser system ( 200kHz) which is not available in many labs. Recently, we have successfully implemented this technique with amplified fs laser pulses at 5kHz repetition rate. Performing electronic wave packet interferometry of dilute atomic vapors we could confirm an excellent SNR. This is surprising since the average laser power in these experiments is factor 800 lower than in previous experiments with 80MHz repetition rate. Moreover, we found that phase-synchronous undersampling can be readily performed with the phase modulation scheme allowing to use even lower repetition rate lasers.

[1] P. F. Tekavec, T. R. Dyke, and A. H. Marcus, J. Chem. Phys. 125, 194303 (2006).