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Instabilities in dispersive optical bistability

A. J. van Wonderen, L.G. Suttorp

Published May 21, 1990• 0 citations
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Abstract

Recently1 accurate experiments on multimode instabilities and self-pulsing in optical bistability have been performed at the University of Lille. The nonlinear medium in these experiments, which could effectively be described as a set of two-level molecules, was contained in a long Fabry- Perot cavity with nonideal mirrors.

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We have recently observed a sinewave self-pulsing in the beam transmitted by a passive cavity containing 2-level molecules, driven by a continuous wave. In this experiment made at a wavelength λ ≅ 3.5 mm, the intracavity Rabi frequency is comparable to the free spectral range ( 830 kHz ) of the very long cavity used (l =182 m) {1} and much larger than the collisional linewidth (≅ 25 kHz) .The medium is then strongly saturated by the driving field ( saturation parameter > 1000) so that its absorption , heavy in the linear regime (αl > 100), is in fact quite moderate. We claim that the self-pulsing observed in these conditions is the first experimental evidence of the multimode instability, predicted a long time ago by Bonifacio and Lugiato {2} but not yet observed. This instability is the multimode counterpart of the single mode instability, recently observed by Orozco et al {3}.