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NATO ASI series. Series B : Physics

Empty Nonlinear Optical Resonators

A. Dorsel, W. J. Firth, A. Guzman de Garcia, John D. McCullen, Fernand D. S. Marquis, Pierre Meystre, D. P. J. O’Brien, G. Reiner, M. Sargent, Kikuo Ujihara, E. Vignes, HERBERT WALTHER, Ewan M. Wright

Published Jan 1, 1986• 1 citation
Publisher
DOI
10.1007/978-1-4613-2181-1_25

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Optical resonators, usually in the form of spherical-mirror interferometers, are employed in a wide variety of experiments, including studies of steady-state and dynamic behavior in lasers and optical bistability. To make meaningful comparisons between experiment and theory, a resonator must be characterized in terms of its losses; that is, the behavior of the empty, or linear, resonator must be well understood if one wishes to understand the behavior of the filled, nonlinear resonator. In general, however, it is not possible to characterize an optical cavity in terms of a single loss parameter. Doing so results, for example, in a different state equation for optical bistability.
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We present an optical resonator with modified properties due to a nonabsorbing highly dispersive medium. The steep nonabsorbing dispersion is created with an additional pump field in an atomic beam using the effect of coherent population trapping. The linewidth of such a resonator depends on the slope of the dispersion line, which in turn depends on the atomic density and the intensity of pump and probe field. In the experiments presented here, the cavity linewidth is reduced by a factor of more than 50 relative to the linewidth of the empty resonator. We have studied the influence of the relative intensities of pump and probe field on the line profile. Due to the dispersion of the medium, the resonance frequency is nearly independent of the geometrical length of the resonator.