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Quantum Electronics and Laser Science Conference

Guiding of light in an ultracold, anisotropic medium

Mukund Vengalattore, Mara Goff Prentiss

Published Dec 10, 2005• 0 citations
Publisher

Abstract

Guiding of a weak probe beam in an ultracold, anisotropic medium is demonstrated. The guide can be tuned by dressing the atoms with a strong pump. This medium is also used to realize a fast, all-optical switch.
DOI
10.1109/qels.2005.1548823

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We investigate the propagation of a weak probe laser field in a medium of warm Rb atoms, controlled with two strong resonant pump fields tuned to the D1 and D2 optical transitions to form an N-scheme arrangement. We have shown theoretically that four-wave mixing has a profound effect on the probe-field group velocity and absorption, allowing the probe-field propagation to be continuously tuned from superluminal to slow-light regimes with amplification. We have also identified the experimental conditions for observation of such tunable slow-to-fast light regime (continuously through the point of zero group index) with positive probe-field gain, and demonstrated that the spectral range corresponding to the zero group index can be tuned by controlling the power of one of the pump laser.
We propose a design of an all-optical transistor based on a one-dimensional photonic-crystal cavity doped with a four-level N\mathsf{N}N-type active Raman gain medium. The calculated results show that in a photonic-crystal cavity of this kind transmission and reflection of the probe (Raman) beam are strongly dependent on the optical switching power. Transmission and reflection of the probe beam can be greatly amplified or attenuated. Therefore the optical switching field can serve as a gate field of the transistor to effectively control propagation of the weak probe field. It is shown that the group velocity of the probe pulse can be controlled in the range from subluminal (slow light) to superluminal (fast light).
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