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Geometry, Sagnac ring lasers and twisted EM modes

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>09/2005
<mark>Journal</mark>General Relativity and Gravitation
Issue number9
Number of pages20
Pages (from-to)1555-1574
<mark>Original language</mark>English


A new geometric approximation scheme, designed to solve the covariant Maxwell equations inside a rotating hollow slender conducting cavity (modelling a ring-laser) on a background spacetime, is constructed. It is shown that for well-defined conditions the electromagnetic spectrum splits into TE- and TM-type modes. 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.