Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Ultra-cold atoms, ions and BEC II (with Q)

A 8.6: Vortrag

Montag, 17. März 2014, 15:15–15:30, BEBEL E34

Electromagnetically induced transparency in optical lattices — •Khaled Mohamed Almhdi Alghtus and Alejandro Saenz — AG Moderne Optik, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany

Electromagnetically induced transparency in ultracold atomic gases trapped in optical lattices should be more efficient than in vapour, since collisions and thus dephasing are reduced. In this work the manipulation of electromagnetically induced transparency in optical lattices by a microwave field coupling the two ground states is discussed. The importance of the relative phases of the optical and microwave fields as well as the light shifts due to the optical-lattice forming laser beams is investigated. It is shown how the microwave field can help to control the group velocity and thus the slowing of the light. Furthermore, it is demonstrated analytically how the additional microwave field can be used to compensate for the light shifts (red-detuned case) caused by the additional lattice-forming beam. In addition, various filling patterns of the atoms over the optical lattice are simulated. The coherence and population decay in various filling patterns are discussed. Finally, we have investigated how the concept of neural networks can be used to classify different patterns of the optical lattice and to simulate the coherence decay for different patterns for optimizing the optical lattice and its filling pattern for an optimal effect of electromagnetically induced transparency.