Coherence properties of a continuous atom laser

We investigate the coherence properties of an atomic beam evaporatively cooled in a magnetic guide, assuming thermal equilibrium in the quantum degenerate regime. The gas experiences two-dimensional, transverse Bose-Einstein condensation rather than a full three-dimensional condensation because of t...

Full description

Saved in:
Bibliographic Details
Published inarXiv.org
Main Authors Castin, Yvan, Dum, Ralph, Mandonnet, Emmanuel, Minguzzi, Anna, Carusotto, Iacopo
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 15.06.2000
Subjects
Atom lasers
Atomic beams
Atomic interactions
Chemical potential
Coherence length
Condensation
De Broglie wavelengths
Evaporative cooling
Laser beams
Laser cooling
Magnetic properties
Organic chemistry
Variations
Online AccessGet full text

Cover

More Information
Summary:We investigate the coherence properties of an atomic beam evaporatively cooled in a magnetic guide, assuming thermal equilibrium in the quantum degenerate regime. The gas experiences two-dimensional, transverse Bose-Einstein condensation rather than a full three-dimensional condensation because of the very elongated geometry of the magnetic guide. First order and second order correlation functions of the atomic field are used to characterize the coherence properties of the gas along the axis of the guide. The coherence length of the gas is found to be much larger than the thermal de Broglie wavelength in the strongly quantum degenerate regime. Large intensity fluctuations present in the ideal Bose gas model are found to be strongly reduced by repulsive atomic interactions; this conclusion is obtained with a one-dimensional classical field approximation valid when the temperature of the gas is much higher than its chemical potential, k_B T >> |mu|.
ISSN:2331-8422
DOI:10.48550/arxiv.0006250