Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster: Quantum Optics and Photonics II

Q 42.5: Poster

Wednesday, March 13, 2019, 16:15–18:15, S Atrium Informatik

Semiclassical Laser Cooling in Strongly Focussed Laser Field Configurations — Thorsten Haase, •Maximilian Schumacher, and Gernot Alber — Institut für Angewandte Physik, Technische Universität Darmstadt, Hochschulstraße 4a, D-64289 Darmstadt

Laser cooling is a widely used technique in experiments in quantum optics and quantum information science. For most purposes of cooling above the Doppler limit laser fields are used which can be modelled by plane running waves. In this regime, the interaction between the radiation field and particles, typically modelled by two-level systems, is well explained by the semiclassical theory of Doppler cooling. Standing waves exhibit a different behaviour with analogies to blue detuned laser cooling at higher intensities [Ci92]. We present simulations of the behaviour of trapped two-level systems and dengerated few-level- systems interacting with different kinds of mode structures, including standing waves and strongly focused waves. We compare the results of our simulations with experimental data from the 4PiPac experiment in Erlangen [Al17], where the ion is trapped around the focus of a parabolic mirror to achieve almost perfect atom-photon coupling.

[Ci92] Cirac et. al, Phys. Rev. A, Vol. 46, No. 5, Sep 1992, 2668-2681

[Al17] Alber et. al, J. Europ. Opt. Soc. Rap. Public. 13, 14 (2017)