Influence of aberrations on confocal-based remote refractive index measurements

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dc.contributor.authorFord, Helen D.
dc.contributor.authorFrancis, Daniel
dc.contributor.authorHallam, Jonathan M.
dc.contributor.authorTatam, Ralph P.
dc.date.accessioned2020-02-05T16:34:36Z
dc.date.available2020-02-05T16:34:36Z
dc.date.issued2019-08-13
dc.description.abstractConfocal scanning combined with low-coherence interferometry is used to provide remote refractive index and thickness measurements of transparent materials. The influence of lens aberrations in the confocal measurement is assessed through ray-trace modeling of the axial point-spread functions generated using optical configurations comprised of paired aspherics and paired achromats. Off-axis parabolic mirrors are suggested as an alternative to lenses and are shown to exhibit much more symmetric profiles provided the system numerical aperture is not too high. The modeled results compare favorably with experimental data generated using an optical instrument comprised of a broadband source and line-scan spectrometer. Refractive index and thickness measurements are made with each configuration with most mirror pairings offering better than twice the repeatability and accuracy of either lens pairing.en_UK
dc.identifier.citationFord HD, Francis D, Hallam JM, Tatam RP. (2019) Influence of aberrations on confocal-based remote refractive index measurements. Applied Optics, Volume 58, Issue 24, August 2019, pp. 6474-6485en_UK
dc.identifier.issn1559-128X
dc.identifier.urihttps://doi.org/10.1364/AO.58.006474
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15096
dc.language.isoenen_UK
dc.publisherOptical Society of Americaen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectconfocalen_UK
dc.subjectlow-coherenceen_UK
dc.subjectinterferometryen_UK
dc.subjectrefractive indexen_UK
dc.subjectparabolic mirroren_UK
dc.subjectaberrationen_UK
dc.subjectpoint-spread functionen_UK
dc.titleInfluence of aberrations on confocal-based remote refractive index measurementsen_UK
dc.typeArticleen_UK

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