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Measurement of planar refractive index profiles with rapid variations in glass using interferometry and total variation regularized differentiation

Oven, Robert (2015) Measurement of planar refractive index profiles with rapid variations in glass using interferometry and total variation regularized differentiation. Journal of Modern Optics, 62 (sup2). S59-S66. ISSN 0950-0340. (doi:10.1080/09500340.2015.1083130)

Abstract

Planar refractive index profiles with rapid variations, formed in glass, are measured with interferometry. This involves forming a bevel in the glass and orientating the fringe pattern to be normal to the bevel edge. The index profile is determined by differentiation of the phase function of the fringe pattern. The differentiation has been performed using the total variation regularization method in order to preserve rapid changes in the derivative. This new approach avoids the necessity of filtering, in order to reduce noise, in the direction perpendicular to the bevel, which would otherwise smooth out the rapid index changes. The method is assessed using a model refractive index profile that contains an index gradient of 0.24 ?m?1 and is then applied practically to measure the refractive index profile of electrically poled BK7 glass. The new approach allows the sharp transition in the index between poled and unpoled glass to be observed as well as the accumulation of potassium ions beyond the poled glass region.

Item Type: Article
DOI/Identification number: 10.1080/09500340.2015.1083130
Uncontrolled keywords: fringe pattern analysis, total variation regularization differentiation, poled glass, refractive index profile
Subjects: T Technology
Divisions: Faculties > Sciences > School of Engineering and Digital Arts
Faculties > Sciences > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: Tina Thompson
Date Deposited: 30 Sep 2015 13:21 UTC
Last Modified: 25 Jan 2020 04:08 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50693 (The current URI for this page, for reference purposes)
Oven, Robert: https://orcid.org/0000-0002-8517-3634
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