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Twisted electromagnetic modes and Sagnac ring lasers

Burton, David A. and Noble, Adam and Tucker, Robin W. and Wiltshire, D. L. (2005) Twisted electromagnetic modes and Sagnac ring lasers. Classical and Quantum Gravity, 22 (6). pp. 909-931. ISSN 0264-9381

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Abstract

A new approximation scheme, designed to solve the covariant Maxwell equations inside a rotating hollow slender cavity (modelling a ring laser), is constructed. It is shown that for well-defined conditions there exist TE and TM modes with respect to the longitudinal axis of the cavity. A twisted mode spectrum is found to depend on the integrated Frenet torsion of the cavity and this in turn may affect the Sagnac beat frequency induced by a non-zero rotation of the cavity. The analysis is motivated by attempts to use ring lasers to measure terrestrial gravito-magnetism or the Lense–Thirring effect produced by the rotation of the earth.

Item Type: Article
Journal or Publication Title: Classical and Quantum Gravity
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 9664
Deposited By: Ms Margaret Calder
Deposited On: 18 Jun 2008 14:36
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 22:17
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9664

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