Coherent light scattering measurements on single and cladded optical glass fibres
- 1 January 1970
- journal article
- Published by Institution of Engineering and Technology (IET) in Radio and Electronic Engineer
- Vol. 39 (2) , 105-111
- https://doi.org/10.1049/ree.1970.0013
Abstract
This paper considers the scattering, at normal incidence, of a laser beam by single and cladded optical glass fibres with a view to estimating their radii and refractive indices. For parallel and perpendicular polarizations of the incident light, the scattered intensity was calculated using the wave theory. The scattering pattern from a single fibre was also calculated by geometrical optics. The light scattered by a cladded fibre in air was photographed for fibres of three different overall diameters. A similar experiment was conducted for the fibre immersed in a liquid having a refractive index near to that of the cladding. Matching was achieved by thermal means.In both cases considered, the experimental results were found to be in agreement with theoretical results. For a cladded fibre in air, information about the core could not be obtained but a measurement of the angular fringe spacings and positions enabled the cladding diameter and index to be calculated. For a cladded fibre immersed in an index matching liquid, it was found that a measurement of the angular positions of minimum intensity enabled the core diameter to be calculated.Keywords
This publication has 1 reference indexed in Scilit:
- Light Scattering by Small ParticlesPhysics Today, 1957