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Experimental Investigation of Three-Dimensional Single and Double optical Lattices
Stockholm University, Faculty of Science, Department of Physics.
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.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-1Libris ID: 8636533ISBN: 91-7265-518-6 (print)OAI: oai:DiVA.org:su-1DiVA: diva2:189136
Public defence
2002-10-04, sal FD5, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Available from: 2002-11-01 Created: 2002-11-01 Last updated: 2017-12-01Bibliographically approved
List of papers
1. Temperatures in 3D optical lattices influenced by neighbouring transitions
Open this publication in new window or tab >>Temperatures in 3D optical lattices influenced by neighbouring transitions
2001 (English)In: European Physical Journal D: Atomic, Molecular and Optical Physics, ISSN 1434-6060, E-ISSN 1434-6079, Vol. 13, no 3, 379-384 p.Article in journal (Refereed) Published
Abstract [en]

A detailed experimental study of the steady-state temperature in a 3D optical lattice for cesium has been performed for a wide range of detunings. Specifically, we have investigated the situation with the cooling and trapping light detuned far red of a (J(g) --> J(e) = J(g) + 1)-transition, where the blue detuned interaction with a (J(g) --> J(e) = J(g))-transition can not be neglected. We find that the temperature scales with the optical potential due to the interaction with just the (J(g) --> J(e) = J(g) + 1)-transition. This indicates that blue Sisyphus cooling has essentially no effect on the dynamics of the system, when there exists a neighbouring red detuned transition.

Identifiers
urn:nbn:se:su:diva-22590 (URN)
Note
Part of urn:nbn:se:su:diva-1Available from: 2002-11-01 Created: 2002-11-01 Last updated: 2017-12-13Bibliographically approved
2. Experimental investigation of the limit of Sisyphus cooling
Open this publication in new window or tab >>Experimental investigation of the limit of Sisyphus cooling
2000 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, 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.

Keyword
Optics, Physics, Atomic, Molecular & Chemical
Identifiers
urn:nbn:se:su:diva-22591 (URN)
Note
Part of urn:nbn:se:su:diva-1Available from: 2002-11-01 Created: 2002-11-01 Last updated: 2017-12-13Bibliographically approved
3. Anisotropic velocity distributions in 3D dissipative optical lattices
Open this publication in new window or tab >>Anisotropic velocity distributions in 3D dissipative optical lattices
2003 (English)In: European Physical Journal D: Atomic, Molecular and Optical Physics, ISSN 1434-6060, E-ISSN 1434-6079, Vol. 22, no 3, 333-339 p.Article in journal (Refereed) Published
Abstract [en]

We present a direct measurement of velocity distributions in two dimensions by using an absorption imaging technique in a 3D near resonant optical lattice. The results show a clear difference in the velocity distributions for the different directions. The experimental results are compared with a numerical 3D semi-classical Monte-Carlo simulation. The numerical simulations are in good qualitative agreement with the experimental results.

Keyword
*INTERFERENCE (Light) *OPTICS *LASER beams *MONTE Carlo method *QUANTUM theory *IMAGING systems
National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-22592 (URN)10.1140/epjd/e2003-00038-4 (DOI)
Note
Part of urn:nbn:se:su:diva-1Available from: 2002-11-01 Created: 2002-11-01 Last updated: 2017-12-13Bibliographically approved
4. Experiments with a 3D Double Optical Lattice
Open this publication in new window or tab >>Experiments with a 3D Double Optical Lattice
2003 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 90, no 5, 053001- p.Article in journal (Refereed) Published
Abstract [en]

We present a setup where we trap two different cesium hyperfine ground states in two different near-resonant optical lattices with identical topographies. We demonstrate that we can change the relative spatial phase between the lattices and we measure the equilibrium temperature as a function of the relative spatial phase. This provides a topographical chart of the optical potential. We also determine the rate at which atoms are transferred between the lattices and show that the setup is a promising candidate for implementing coherent quantum state manipulation.

Keyword
ATOMS; DENSITY; CESIUM
National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-22593 (URN)10.1103/PhysRevLett.90.053001 (DOI)
Note
Part of urn:nbn:se:su:diva-1Available from: 2002-11-01 Created: 2002-11-01 Last updated: 2017-12-13Bibliographically approved
5. Temperature and optical pumping rates in a bichromatic 3D Optical Lattice
Open this publication in new window or tab >>Temperature and optical pumping rates in a bichromatic 3D Optical Lattice
(English)Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:su:diva-22594 (URN)
Note
Part of urn:nbn:se:su:diva-1Available from: 2002-11-01 Created: 2002-11-01 Last updated: 2009-12-18Bibliographically approved

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