title: Cavity linewidth narrowing and broadening due to competing linear and nonlinear dispersions.
abstract: We experimentally demonstrate cavity linewidth control by manipulating dispersion of the intracavity medium. By making use of the dramatic change of Kerr nonlinearity near electromagnetically induced transparency resonance in a three-level atomic system, the cavity transmission linewidth can be greatly modified. As the cavity input intensity increases, the cavity linewidth changes from below to above empty cavity linewidth, corresponding to subluminal and superluminal photon propagation in the cavity, respectively.
authors.affiliation: Department of Physics, University of Arkansas, Fayetteville 72701, USA.
authors.forename: Haibin
authors.initials: H
authors.lastname: Wu
authors.forename: Min
authors.initials: M
authors.lastname: Xiao