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Thorsten Haase - "Laser Cooling in a Parabolic Mirror"

Institut für Angewandte Physik Technische Universität Darmstadt

Max Planck Institute for the Science of Light

Time, place:
Wednesday, February 8, 2017, 11 a.m.
Small Seminar room A.2.500, Staudtstr. 2

The efficient coupling of light to single quantum receivers is of high interest in quantum optics and quantum communication. In the 4piPAC experiment, coupling inside a parabolic mirror is investigated. Measurements of the scattering rate show deviations of the expected saturation behaviour at higher intensities. To explain this kind of unexpected results, we propose a semiclassical theory for laser cooling inside the parabolic mirror which includes both standing waves and strongly focused waves. Our treatment predicts relevant deviations from the usual case of Doppler cooling which typically considers plane running waves only. These generalisations affect the motion of the particle and lead to different probability density functions for the position inside the trap. Stochastic simulations are presented for probability density functions and for the mean excitation probability which corresponds to the scattering rate as
experimentally accessible quantity.