Output Spectrum of Single-Atom Lasers

Details Output Spectrum of Single-Atom Lasers Output Spectrum of Single-Atom Lasers

1999-07-26

arxiv.org/abs/quant-ph/9907085v2

Physics

Quantum Physics

11 pages, 20 figures, minor typographical errors corrected

Scientific paper

We consider a laser composed of a single atom in a microcavity, with a coherent or incoherent pump. We consider both three- and four-level gain schemes, and examine the output spectrum of such lasers. We find that the linewidth generally scales as the inverse of the photon number. For large atom-field coupling, a vacuum-Rabi doublet structure is obtained. In the three-level case, this vacuum-Rabi splitting is apparent only for small intracavity photon numbers, and vanishes for large pumps. In the four-level scheme, the vacuum-Rabi structure appears at a nonzero pump level, and is maintained for large pumps, even when the intracavity photon number is larger than unity. This behavior is explained utilizing the quantum trajectory approach.

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