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Experimental investigation of the limit of Sisyphus cooling
Stockholm University, Faculty of Science, Department of Physics.
2000 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, Vol. 62, no 5Article in journal (Refereed) Published
Abstract [en]

We present measurements of the steady-state temperature in a three-dimensional cesium optical lattice, operating in the near-resonance regime of the D2 line. For various detunings between the (F-g=4 -->F-e=5) and the (F-g=4 -->F-e=4) transitions, we systematically determine at which intensities/optical potential modulation depths the Sisyphus cooling process breaks down and what the lowest achievable temperatures are. We find that the minimum temperature decreases as we increase the detuning with respect to the (F-g=4 -->F-e=5) transition.

Place, publisher, year, edition, pages
2000. Vol. 62, no 5
Keyword [en]
Optics, Physics, Atomic, Molecular & Chemical
URN: urn:nbn:se:su:diva-22591OAI: diva2:189132
Part of urn:nbn:se:su:diva-1Available from: 2002-11-01 Created: 2002-11-01 Last updated: 2009-10-07Bibliographically approved
In thesis
1. Experimental Investigation of Three-Dimensional Single and Double optical Lattices
Open this publication in new window or tab >>Experimental Investigation of Three-Dimensional Single and Double optical Lattices
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A complete laser cooling setup was built, with focus on threedimensional near-resonant optical lattices for cesium. These consist of regularly ordered micropotentials, created by the interference of four laser beams. One key feature of optical lattices is an inherent ”Sisyphus cooling” process. It efficiently extracts kinetic energy from the atoms, leading to equilibrium temperatures of a few µK. The corresponding kinetic energy is lower than the depth of the potential wells, so that atoms can be trapped.

We performed detailed studies of the cooling processes in optical lattices by using the time-of-flight and absorption-imaging techniques. We investigated the dependence of the equilibrium temperature on the optical lattice parameters, such as detuning, optical potential and lattice geometry. The presence of neighbouring transitions in the cesium hyperfine level structure was used to break symmetries in order to identify, which role “red” and “blue” transitions play in the cooling. We also examined the limits for the cooling process in optical lattices, and the possible difference in steady-state velocity distributions for different directions. Moreover, in collaboration with ´Ecole Normale Sup´erieure in Paris, numerical simulations were performed in order to get more insight in the cooling dynamics of optical lattices.

Optical lattices can keep atoms almost perfectly isolated from the environment and have therefore been suggested as a platform for a host of possible experiments aimed at coherent quantum manipulations, such as spin-squeezing and the implementation of quantum logic-gates. We developed a novel way to trap two different cesium ground states in two distinct, interpenetrating optical lattices, and to change the distance between sites of one lattice relative to sites of the other lattice. This is a first step towards the implementation of quantum simulation schemes in optical lattices.

Place, publisher, year, edition, pages
Stockholm: Fysikum, 2002. 67 p.
urn:nbn:se:su:diva-1 (URN)91-7265-518-6 (ISBN)
Public defence
2002-10-04, sal FD5, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00
Available from: 2002-11-01 Created: 2002-11-01Bibliographically approved

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