Theory of a single-atom laser including light forces

Thomas Salzburger, P. Domokos, Helmut Ritsch

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We study a single incoherently pumped atom moving within an optical high-Q resonator in the strong-coupling regime. Using a semiclassical description for the atom and field dynamics, we derive a closed system of differential equations to describe this coupled atom-field dynamics. For sufficiently strong pumping, the system starts lasing when the atom gets close to a field antinode, and the associated light forces provide for self-trapping of the atom. For a cavity mode blue detuned with respect to the atomic transition frequency, this is combined with cavity-induced motional cooling, allowing for long-term steady-state operation of such a laser. The analytical results for temperature and field statistics agree well with our earlier predictions based on quantum Monte Carlo simulations. We find sub-Doppler temperatures that decrease with gain and coupling strength, and can even go beyond the limit of passive cavity cooling. Besides demonstrating the importance of light forces in single-atom lasers, this result also gives strong evidence to enhance laser cooling through stimulated emission in resonators.

Original languageEnglish
Article number033805
JournalPhysical Review A
Volume72
Issue number3
DOIs
Publication statusPublished - Sep 2005

Fingerprint

lasers
atoms
cavities
resonators
antinodes
cooling
laser cooling
stimulated emission
lasing
Q factors
pumping
differential equations
trapping
statistics
temperature
predictions
simulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy(all)

Cite this

Theory of a single-atom laser including light forces. / Salzburger, Thomas; Domokos, P.; Ritsch, Helmut.

In: Physical Review A, Vol. 72, No. 3, 033805, 09.2005.

Research output: Contribution to journalArticle

Salzburger, Thomas ; Domokos, P. ; Ritsch, Helmut. / Theory of a single-atom laser including light forces. In: Physical Review A. 2005 ; Vol. 72, No. 3.
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