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Atom laser divergence.

Y Le Coq1, J H Thywissen, S A Rangwala

  • 1Laboratoire Charles-Fabry de l'Institut d'Optique, UMRA 8501 du CNRS, 91403 Orsay, France.

Physical Review Letters
|November 3, 2001
PubMed
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We studied the angular divergence of atom lasers. The primary cause of divergence was found to be the interaction between the atom laser and the condensate, not diffraction or magnetic lensing.

Area of Science:

  • Atomic physics
  • Quantum optics
  • Laser physics

Background:

  • Atom lasers are coherent matter-wave beams derived from Bose-Einstein condensates.
  • Understanding atom laser properties is crucial for applications in atom optics and quantum information.
  • Previous models often simplified or neglected interactions within the source condensate.

Purpose of the Study:

  • To experimentally measure the angular divergence of a quasicontinuous, rf-outcoupled, free-falling atom laser.
  • To compare experimental data with a generalized Gaussian-beam model.
  • To identify the dominant factors contributing to atom laser divergence.

Main Methods:

  • Utilized a quasicontinuous, rf-outcoupled, free-falling atom laser setup.
  • Measured angular divergence as a function of outcoupling frequency.

Related Experiment Videos

  • Employed a Gaussian-beam propagation model incorporating diffraction, magnetic lensing, and condensate-laser interactions.

    • Main Results:

    • The angular divergence was successfully measured and characterized.
    • The experimental data showed deviations from simpler models.
    • The condensate-laser interaction was identified as the most significant contributor to divergence.

    Conclusions:

    • The interaction between the atom laser and the source condensate is the dominant factor limiting its collimation.
    • A generalized Gaussian-beam model provides a more accurate description of atom laser propagation.
    • This finding has implications for the design and optimization of atom laser sources and applications.