1. Articles from Andrew Beaumont

    1-3 of 3
    1. Refractive index mapping of layered samples using optical coherence refractometry

      In this paper a novel method for determining refractive indices of a multi-layered samples using low coherence interferometry (LCI), developed at the National Physical Laboratory, UK, is introduced. Conventional Optical Coherence Tomography (OCT) utilises a lateral scanning optical probe beam to construct a depth resolved image of the sample under investigation. All interfaces are detected in optical path length, resulting in an image depending on the refractive index of all prior layers. This inherent ambiguity in optical and geometric path length reduces OCT images to purely qualitative ones. We have demonstrated that by optically probing the sample at multiple angles ...
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    2. Optical coherence refractometry

      Peter H. Tomlins, Peter Woolliams, Christian Hart, Andrew Beaumont, Matthew Tedaldi 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 ... [Opt. Lett. 33, 2272-2274 (2008)]
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    3. Measurement of the three-dimensional point-spread function in an optical coherence tomography imaging system

      Peter H. Tomlins, Peter Woolliams, Matthew Tedaldi et al. Two significant figures of merit for optical coherence tomography (OCT) systems are the axial and transverse resolutions. Transverse resolution has been defined using the Rayleigh Criterion or from Gaussian beam optics. The axial resolution is generally defined in terms of the coherence length of a ... [Proc. SPIE Int. Soc. Opt. Eng. 6847, 68472Q (2008)] published Mon Feb 18, 2008.
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    1-3 of 3
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  2. Topics in the News

    1. (3 articles) Matthew Tedaldi
    2. (3 articles) Peter D. Woolliams
    3. (3 articles) Pete H. Tomlins
    4. (2 articles) UK National Physical Laboratory
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