Mainz 2017 – scientific programme

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MO: Fachverband Molekülphysik

MO 16: Posters 3: Experimental Techniques and Theoretical Approaches

MO 16.5: Poster

Thursday, March 9, 2017, 17:00–19:00, P OG1

Optimization of data acquisition in time-domain spectroscopy experiments — •Daniel Uhl, Lukas Bruder, Marcel Binz, Ulrich Bangert, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Germany

We are exploring different approaches to optimize the data acquisition in time-domain spectroscopy, in particular, in phase-modulated pump-probe and 2D spectroscopy experiments. On the one hand, compressed sensing can be used to significantly reduce the amount of data points, while yielding the same information content. This method allows in principle to go below the fundamental boundary of the sampling rate given by the Nyquist-Shannon-Theorem. On the other hand, we work on a software-based lock-in amplifier to improve data acquisition which represents a cost-effective alternative to commercial devices. This provides much higher flexibility: simultaneous detection with custom demodulators and filter algorithms is possible and acquisition times can be individually optimized for specific applications.