Abstract

We examine numerically the Q values of some of the core whispering-gallery resonances of a fiber clad with a material of lower refractive index, which differ from those of a homogeneous fiber of the same relative refractive index. The enhancement and reduction of the Q values are explained in terms of interference effects caused by internal reflection from the surface of the fiber cladding; a simple model gives the period of the interference modulation. The effect of this modulation has been observed in the whispering-gallery-modelaser spectra from a dye-doped highly refractive solvent flowing in a normally illuminated fused-silica capillary.

© 1993 Optical Society of America

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