Chow, Jong H.Sheard, Benjamin S.McClelland, David E.Gray, Malcolm B.Littler, Ian C. M.2016-05-182016-05-180146-9592http://hdl.handle.net/1885/101447Photothermal effects in passive Fabry–Perot resonators are caused by the conversion of circulating optical energy into heat as a result of absorption. This results in thermal change in the resonator’s optical path length, the round-trip phase, and hence the resonance condition. We describe a simplified dynamic numerical model for photothermal effects in passive fiber Bragg grating resonators and present results of their experimental observation.This research was supported by the Australian Research Council under the auspices of the Australian Consortium for Interferometric Gravitational Astronomy, with partial assistance from the Centre for Ultrahigh Bandwidth Devices for Optical Systems.© 2005 Optical Society of AmericaKeywords: Energy conversion; Fabry-Perot interferometers; Laser beams; Light absorption; Light amplifiers; Nonlinear optics; Optical Kerr effect; Optical pumping; Optical resonators; Phase shift; Photorefractive materials; Material expansion; Optical path length (O200510.1364/OL.30.0007082016-06-14