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The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting

Wide band optical switch via white light cavity

M. Al-Amri, Jingping Xu, Muhammad Suhail Zubairy

Published Jan 1, 2013• 1 citation
Publisher

Abstract

Controlling reflectivity optically over a wide range of frequency band can be of great demand. We show how such a devise can be realized using a Fabry-Pérot cavity filled with a three-level atomic gas.
DOI
10.1364/cqo.2013.m6.56

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We propose a device whose reflectivity can be controlled optically over a wide frequency band. To this objective, we propose a Fabry-P\'erot cavity filled with a three-level atomic gas such that the effective susceptibility can be adjusted through incoherent pump and coherent driving fields. Adopting the concepts of electromagnetic-induced transparency and the white light cavity, we can control the susceptibility to break or satisfy the resonance condition over a wide frequency range, resulting in a wide-band optical switch. In addition to numerical calculation, we first give the analytical parameters, such as pump rate, and the Rabi frequency of the driven field, required for white light cavity in this paper. Using such a cavity as a wall of another cavity, we can, optically, realize a wide-band QQQ-switched cavity. Such a device can also be used as a new type of optical switch for quantum information.
We theoretically investigate the double-$\mathrm{\ensuremath{\Lambda}}$ scheme inside a Fabry-P\'erot cavity employing a weak probe beam and two strong driving fields together with an incoherent pumping mechanism. By generating analytical expressions for the susceptibility and applying the white-light cavity conditions, we devise a procedure that reaches the white-light condition at a smaller gas density than the values typically cited in similar previous studies. Further, when the intensities of the two driving fields are equal, a single giant white band is obtained, while for unequal driving fields three white bands can be present in the cavity. Two additional techniques are then advanced for generating three white bands and a method is described for displacing the center frequency of the bands. Finally, some potential applications are suggested.