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arXiv:1302.1694 · Physical Review A

Optical instabilities in a three-level Λ and V system inside a double cavity

H. Aswath Babu, Harshawardhan Wanare

Published Aug 9, 2013• 7 citations
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Abstract

We obtain optical instabilities in all-optical bistable systems arising from competing cooperative pathways at low input light levels. In particular, for three-level atomic systems in the $\ensuremath{\Lambda}$ and V configuration interacting with two independent cavity modes, we identify the necessary conditions related to the incoherent pathways required to obtain instabilities. The instabilities arise when atomic states involved in the bistable transition are leaky and have substantial population, where the incoherent processes directly hinder the cooperative preparation of the atomic ensemble.

DOI
10.1103/physreva.88.023814

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We present dual hysteretic behavior of a three-level ladder system exhibiting optical bistability in a double-cavity configuration in the mean-field limit. The two fields coupling the atomic system experience competing cooperative effects along the two transitions. We observe a hump-like feature in the bistable curve arising due to cavity-induced inversion, which transforms into a negative-hysteresis loop. Apart from negative- and positive-hysteresis regions, the system offers a variety of controllable nonlinear dynamical features, ranging from switching, periodic self-pulsing to chaos.
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We theoretically investigate the optical bistability phenomenon in an ensemble of NNN non-interacting three-level atoms trapped inside an optical cavity. The atoms are in a ΛΛΛ-level configuration, where one atomic transition is coupled by a cavity mode, while the other one is coupled by a classical field. In addition, we consider a pumping field driving the cavity mode. With this system, we are able to observe new kinds of hysteresis, while scanning either the frequency of the pumping field or the Rabi frequency (intensity) of the control field. We show that they can be highly controllable via external parameters of the system, achieving very narrow widths, thus being very useful for building new devices, such as small fluctuation detectors in either frequency or intensity of laser fields.
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