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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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.

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Journal Article
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Classical and Quantum Gravity
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18 Jun 2008 13:36
Last Modified:
21 Sep 2023 01:01