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Optical Engineering

Measurement of capillary core size and taper using whispering-gallery-mode laser emission
Author(s): Jonathan C. Knight; H. Steve T. Driver; Gerald Noel Robertson
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Paper Abstract

We investigate the use of core whispering-gallery modes in a cladded fiber for nondestructive characterization of the fiber core and show how such measurements can be performed by simple extension of known methods for homogeneous scatterers, if the core refractive index is significantly greater than that of the cladding. We describe the effects of dispersion on such measurements. The method is illustrated by using the core-resonance laser emission from a dye-doped solvent flowing in a capillary fiber to demonstrate a linear relationship between mode spacing and core size and to measure the taper of the fiber core.

Paper Details

Date Published: 1 September 1994
PDF: 5 pages
Opt. Eng. 33(9) doi: 10.1117/12.175670
Published in: Optical Engineering Volume 33, Issue 9
Show Author Affiliations
Jonathan C. Knight, Univ. of Cape Town (South Africa)
H. Steve T. Driver, Univ. of Cape Town (South Africa)
Gerald Noel Robertson, Univ. of Cape Town (South Africa)

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