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Frontiers in Optics

Observation Of Slow-Light And Matched Dispersion In Sodium Vapor For Applications To Laub-Drag Enhanced Rotation Sensing

Renu Tripathi, G. S. Pati, M. Messall, K. Salit, Venkatesh Gopal, M. S. Shahriar

Published Jan 1, 2005• 0 citations
Publisher

Abstract

We demonstrate EIT and slow light (vg ≈ c/600) in sodium vapor, in excellent agreement with a direct interferometric phase measurement of dispersion, for applications to experiments currently pursued to demonstrate Laub-drag enhanced rotation sensing.
DOI
10.1364/fio.2005.jtuc54

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The change in the speed of light as it propagates through a moving material has been a subject of study for almost two centuries. This phenomenon, known as the Fresnel light-drag effect, is quite small and usually requires a large interaction path length and/or a large velocity of the moving medium to be observed. Here, we show experimentally that the observed drag effect can be enhanced by over 2 orders of magnitude when the light beam propagates through a moving slow-light medium. Our results are in good agreement with the theoretical prediction, which indicates that, in the limit of large group indices, the strength of the light-drag effect is proportional to the group index of the moving medium.
We report the experimental observation of enhanced rotation sensing in a slow-light structure. We demonstrate that the differential of the phase difference, introduced by rotation, between the counterpropagating waves is proportional to the group index, and thus we can obtain large rotation sensitivity in the slow-light structure with high dispersion (large group index). The results also predict the realization of highly sensitive and compact integrated rotation sensors and gyroscopes by using microwaveguides.