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MO: Fachverband Molekülphysik

MO 7: Poster 1

MO 7.1: Poster

Donnerstag, 23. September 2021, 17:30–19:30, P

Multiple-quantum coherence signals in thermal vapors — •Friedemann Landmesser, Ulrich Bangert, Lukas Bruder, Marcel Binz, Daniel Uhl, and Frank Stienkemeier — Institute of Physics, University of Freiburg, Germany

We investigate collective effects in thermal atomic alkali vapors by multiple-quantum coherence experiments, where multiphoton processes can be separated from one-photon transitions and can be assigned to specific particle numbers [1,2]. We extended our previous collinear phase-modulated electronic coherent spectroscopy scheme [1] from a 2-pulse to a 4-pulse sequence [2]. The technique is sensitive enough to reveal weak interparticle interactions, despite the thermal motion and the spatial separation of the atoms in the micrometer-range [3]. First results of fluorescence measurements of a potassium vapor will be presented.

[1] L. Bruder et al., Phys. Rev. A 92, 053412 (2015).

[2] S. Yu et al., Opt. Lett. 44, 2795 (2019).

[3] L. Bruder et al., Phys. Chem. Chem. Phys. 21, 2276 (2019).