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Proceedings Paper

Evanescent waves outside eccentric optical cavities
Author(s): Stephen C. Creagh; Michael White
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Paper Abstract

It is described how strongly directional emission may be achieved from whispering gallery modes in optical resonators which are only very slightly deformed from spherical or circular geometry. A theoretical description is offered which uses an extension of eikonal approximation to complex ray families. Natural boundaries arise in the complexified ray families which prevents direct application of ray-theoretical methods. By treating the ray dynamics perturbatively, however, it may be possible to obtain explicit approximation of the exterior field for sufficiently weakly deformed resonators.

Paper Details

Date Published: 17 February 2010
PDF: 9 pages
Proc. SPIE 7579, Laser Resonators and Beam Control XII, 757916 (17 February 2010); doi: 10.1117/12.841664
Show Author Affiliations
Stephen C. Creagh, The Univ. of Nottingham (United Kingdom)
Michael White, The Univ. of Nottingham (United Kingdom)

Published in SPIE Proceedings Vol. 7579:
Laser Resonators and Beam Control XII
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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