Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Ultracold Atoms I (joint session Q/A)

Q 57.7: Vortrag

Donnerstag, 8. März 2018, 12:00–12:15, K 1.022

Semiclassical Laser Cooling in Standing Wave Configurations — •Thorsten Haase and Gernot Alber — Institut für Angewandte Physik, Technische Universität Darmstadt, Germany

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, 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 a semiclassical model for the interaction of a two-level system with arbitrary field modes, which includes standing and strongly focused waves. Our model exactly reproduces the theory of Doppler cooling for running plane waves. Additionally, it gives rise to different cooling properties inside standing laser fields. Our results are consistent with a special case investigated in [Ci92]. We simulate the interaction of a trapped two-level ion in the particular field configuration relevant for 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.

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)