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Optical coherence refractometry.

Tomlins, P H; Woolliams, P D; Hart, C; Beaumont, A; Tedaldi, M (2008) Optical coherence refractometry. Opt. Lett., 33 (19). pp. 2272-2274.

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In this letter, we introduce a novel approach to refractometry using a low coherence interferometer at multiple angles of incidence. We show that for plane parallel samples it is possible to measure their phase refractive index rather than the group index that is usually measured by interferometric methods. This is a significant development because it enables bulk refractive index measurement of scattering and soft samples, not relying on surface measurements that can be prone to error. Our technique is also non-contact and compatible with {\it in situ} refractive index measurements. Here, we demonstrate this new technique on a pure silica test piece and a highly scattering resin slab, comparing the results with standard critical angle refractometry.

Item Type: Article
Keywords: low coherence interferometry, optical coherence tomography, refractive index
Subjects: Optical Radiation and Photonics
Optical Radiation and Photonics > Bio-Medical
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4305

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