Evidence of slow-light effects from rotary drag of structured beams

Wisniewski-Barker, E., Gibson, G. , Franke-Arnold, S. , Shi, Z., Boyd, R.W. and Padgett, M.J. (2013) Evidence of slow-light effects from rotary drag of structured beams. New Journal of Physics, 15(8), 083020. (doi: 10.1088/1367-2630/15/8/083020)

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Publisher's URL: http://dx.doi.org/10.1088/1367-2630/15/8/083020


Self-pumped slow light, typically observed within laser gain media, is created by an intense pump field. By observing the rotation of a structured laser beam upon transmission through a spinning ruby window, we show that the slowing effect applies equally to both the dark and bright regions of the incident beam. This result is incompatible with slow-light models based on simple pulse-reshaping arising from optical bleaching. Instead, the slow-light effect arises from the long upper-state lifetime of the ruby and a saturation of the absorption, from which the Kramers–Kronig relation gives a highly dispersive phase index and a correspondingly high group index.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Gibson, Dr Graham and Padgett, Professor Miles and Franke-Arnold, Professor Sonja
Authors: Wisniewski-Barker, E., Gibson, G., Franke-Arnold, S., Shi, Z., Boyd, R.W., and Padgett, M.J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:New Journal of Physics
Publisher:Institute of Physics Publishing Ltd.
ISSN (Online):1367-2630
Copyright Holders:Copyright © 2013 The Authors
First Published:First published in New Journal of Physics 15(8):083020
Publisher Policy:Reproduced under a Creative Commons License

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