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arXiv:0801.3501 · Physical Review A

Observations of delayed all-optical routing in a slow-light regime

Byoung Seung HAM

Published Jul 30, 2008• 33 citations
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Abstract

We report the observation of a delayed all-optical routing using an ultraslow-light phenomenon in a defected solid medium. Unlike simultaneously enhanced slow-light-based four-wave mixing processes, the present observation demonstrates on-demand delayed all-optical routing via the direct retrieval of atomic coherence strongly coupled with the slow light.

DOI
10.1103/physreva.78.011808

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We report the observation of a delayed all-optical routing using an ultraslow-light phenomenon in a defected solid medium. Unlike simultaneously enhanced slow-light-based four-wave mixing processes, the present observation demonstrates on-demand delayed all-optical routing via the direct retrieval of atomic coherence strongly coupled with the slow light.
Coherent dynamics of slow light for all-optical switching is investigated in a multilevel system of solids for an understanding of self-induced ultraslow light. In an optical population shelving system of a rare-earth doped solid, dynamics of the slow light are presented by using a third optical field controlling shelved atom population. Unlike two-photon coherence-based delayed all-optical switching utilizing electromagnetically induced transparency, the present method relies on one-photon coherence controlling shelved atom population.
Quantum coherent control of slow light for all-optical switching is investigated in a multi-level system of solids for an understanding of self-induced ultraslow light. In an optical population shelving system of a rare-earth doped solid, dynamics of the slow light are presented by using a third optical field controlling shelved atom population. Unlike two-photon coherence-based delayed all-optical switching utilizing electromagnetically induced transparency, the present method relies on one-photon coherence controlling shelved atom population.
Abstract We use a four-wave mixing process to read-out light from atomic coherence which is continuously written. The light is continuously generated after an effective delay, allowing the atomic coherence to evolve during the process. Contrary to slow-light delay, which depends on the medium optical depth, here the generation delay is determined solely by the intensive properties of the system, approaching the atomic coherence lifetime at the weak driving limit. The atomic evolution during the generation delay is further manifested in the spatial profile of the generated light due to atomic diffusion. Continuous generation of light with a long intrinsic delay can replace discrete write–read procedures when the atomic evolution is the subject of interest.