Twisted Electromagnetic Modes and Sagnac Ring-Lasers
General Relativity and Quantum Cosmology
2007-05-23 v1
Abstract
A new approximation scheme, designed to solve the covariant Maxwell equations inside a rotating hollow slender conducting 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.
Cite
@article{arxiv.gr-qc/0411037,
title = {Twisted Electromagnetic Modes and Sagnac Ring-Lasers},
author = {David A. Burton and Adam Noble and Robin W. Tucker and David L. Wiltshire},
journal= {arXiv preprint arXiv:gr-qc/0411037},
year = {2007}
}
Comments
LaTeX 31 pages, 3 Figures