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Stability of continuously pumped atom lasers.

S A Haine1, J J Hope, N P Robins

  • 1Department of Physics and Theoretical Physics, Australian National University, ACT 0200, Australia.

Physical Review Letters
|May 15, 2002
PubMed
Summary

A continuously pumped atom laser becomes unstable below a critical scattering length. Above this critical value, the atom laser achieves a stable steady state, with stability increasing with pumping, which may limit the atom laser linewidth.

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Area of Science:

  • Atomic physics
  • Quantum optics

Background:

  • Atom lasers offer a coherent source of atoms.
  • Understanding their stability is crucial for applications.

Purpose of the Study:

  • To investigate the stability of a continuously pumped atom laser.
  • To identify factors influencing atom laser stability and linewidth.

Main Methods:

  • Utilized a multimode model of a continuously pumped atom laser.
  • Analyzed the system's behavior concerning the scattering length and pumping parameters.

Main Results:

  • The atom laser model exhibits instability below a critical scattering length.
  • Above the critical scattering length, a stable steady state is achieved.

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  • Increased pumping enhances the stability of the steady state.

    • Conclusions:

    • The scattering length is a critical parameter for atom laser stability.
    • Instability arises from gain-loss competition in excited states.
    • This instability imposes a fundamental limit on the atom laser linewidth.