Hannover 2020 – scientific programme

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MO: Fachverband Molekülphysik

MO 6: Electronic Spectroscopy II

MO 6.10: Talk

Tuesday, March 10, 2020, 16:15–16:30, f102

Development of a software-based lock-in amplifier for nonlinear spectroscopy — •Daniel Uhl, Ulrich Bangert, Marcel Binz, Lukas Bruder, Friedemann Landmesser, Andreas Wituschek, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany

Lock-in amplification of modulated signals is widely used to improve detection sensitivity. We use this technique in phase-modulated wave packet interferometry and two-dimensional spectroscopy, which drastically improves the sensitivity [1,2].

To further improve our detection scheme, we*ve developed a software-based lock-in amplifier that provides additional flexibility in the data analysis and readily enables up-scaling of demodulation channels. With this approach, multiple signals can be demodulated simultaneously and custom demodulators and filters can be implemented. As an application example, we have used this technique to improve the phase noise characteristics in wave packet interferometry experiments performed in the XUV spectral range.

[1] L. Bruder et al., Phys. Chem. Chem. Phys. 17, 23877 (2015).

[2] L. Bruder et al., Nat Commun 9, 4823 (2018).