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Applied Physics B

The magnesium ramsey interferometer: Applications and prospects

Uwe Sterr, K. Sengstock, J. H. M�ller, D. Bettermann, Wolfgang A. Ertmer

Published May 1, 1992• 93 citations
Publisher
DOI
10.1007/bf00325377

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Laser cooling and laser manipulation of free neutral atoms have reached a level of sophistication not foreseen just a few years ago. This concerns trapping of neutral atoms at μK temperatures as well as the precise preparation of extreme dense and ultra cold atomic beams. These techniques offer plenty of new experiments answering basic physical questions or allowing totally new levels of precision. The following article will explain, how to prepare such cold beams and it will demonstrate the resulting possibilities for a Ramsey spectrometer at the intercombination line of magnesium. Furthermore first results with this spectrometer set up as magnesium atom interferometer will be presented.

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Scheme for measuring a Berry phase in an atom interferometer

Matthias Reich, Uwe Sterr, Wolfgang A. Ertmer

We present a concept for measuring a Berry phase using an atom interferometer in an optical Ramsey arrangement. The adiabatic cyclic process needed for the appearance of a Berry phase consists of the adiabatic change of population in one of the interferometer arms. A closed circuit in parameter space is realized by the time-dependent Doppler detuning of two additional strongly focused Gaussian beams, which couple selectively to one of the interferometer arms. It is shown that the resulting additional atomic phase consists of a Berry phase corresponding to the phase difference of the two Gaussian beams and a dynamical phase caused by the dynamical Stark effect. By recombining the two interferometer arms this total phase gives rise to a shift of the interference pattern. In case of a Ramsey arrangement with magnesium atoms the parameters of an experimental realization have been calculated. Further improvements using laser-cooled and trapped atoms are discussed.

Physical Review A•Apr 1, 1993•11 citations
Laser cooling and laser manipulation of free neutral atoms have reached a level of sophistication not foreseen just a few years ago. This concerns trapping of neutral atoms at μK temperatures as well as the precise preparation of extreme dense and ultra cold atomic beams. These techniques offer plenty of new experiments answering basic physical questions or allowing totally new levels of precision. The following article will explain, how to prepare such cold beams and it will demonstrate the resulting possibilities for a Ramsey spectrometer at the intercombination line of magnesium. Furthermore first results with this spectrometer set up as magnesium atom interferometer will be presented.
We present a concept for measuring a Berry phase using an atom interferometer in an optical Ramsey arrangement. The adiabatic cyclic process needed for the appearance of a Berry phase consists of the adiabatic change of population in one of the interferometer arms. A closed circuit in parameter space is realized by the time-dependent Doppler detuning of two additional strongly focused Gaussian beams, which couple selectively to one of the interferometer arms. It is shown that the resulting additional atomic phase consists of a Berry phase corresponding to the phase difference of the two Gaussian beams and a dynamical phase caused by the dynamical Stark effect. By recombining the two interferometer arms this total phase gives rise to a shift of the interference pattern. In case of a Ramsey arrangement with magnesium atoms the parameters of an experimental realization have been calculated. Further improvements using laser-cooled and trapped atoms are discussed.