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Proceedings Paper

Interferometric Measurement Of Refractive Index Differences In Optical Fibres
Author(s): K. W. Raine; J. G. N. Baines; D. E. Putland
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Paper Abstract

This paper will discuss measurements of refractive index differences in optical fibres using an image shearing interference microscope. The technique has been used to characterise a multi-step index fibre suitable as a transfer standard to calibrate other more convenient fibre profiling instruments, eg refracted near-field. The technique of axial interferometry, where a thin slice of the fibre about 100 pm thick is viewed along its axis, has been developed so that uncertainties of about ±1% in refractive index differences are considered possible. The implementation of the technique, sources of error and interferometric measurements of slice thickness will be discussed along with the measurement uncertainties. Finally, an intercomparison of results obtained from interferometry, refracted near field, phase contrast microscopy and far-field measurement of light emerging from the fibre end, will be discussed.

Paper Details

Date Published: 3 April 1989
PDF: 5 pages
Proc. SPIE 1121, Interferometry '89, (3 April 1989); doi: 10.1117/12.961290
Show Author Affiliations
K. W. Raine, National Physical Laboratory (United Kingdom)
J. G. N. Baines, National Physical Laboratory (United Kingdom)
D. E. Putland, National Physical Laboratory (United Kingdom)


Published in SPIE Proceedings Vol. 1121:
Interferometry '89

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