Quantum theory of frequency pulling in the cavity-QED microlaser

Hyun-Gue Hong and Kyungwon An
Phys. Rev. A 85, 023836 – Published 24 February 2012

Abstract

The spectrum of the cavity-QED microlaser or micromaser is expected to show distinctive features of the coherent light-matter interaction, which are obscured in the conventional Schawlow-Townes linewidth theory. However, the spectral studies have been limited to resonant atom-cavity interaction so far. Here we consider the dispersive interaction in the off-resonance case, from which we uncover a quantum frequency pulling effect in the microlaser or micromaser spectrum. We present a quantum theory of the spectrum which introduces the notion of a frequency-pulling distribution associated with the photon number. In contrast to the conventional laser, periodic variation of the mean frequency pulling is observed with increasing pump parameter and it is attributed to the strong atom-cavity coupling. The pulling distribution gives rise to a spectral broadening, which can be dominant over the nondispersive broadening addressed in the previous works. We also developed a corresponding semiclassical theory and discuss how the introduction of the frequency shift fits in with the extended quantum theory.

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  • Received 10 January 2012

DOI:https://doi.org/10.1103/PhysRevA.85.023836

©2012 American Physical Society

Authors & Affiliations

Hyun-Gue Hong and Kyungwon An

  • Department of Physics and Astronomy, Seoul National University, Seoul, 151-742, Korea

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Issue

Vol. 85, Iss. 2 — February 2012

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