Temperature-dependent absolute refractive index measurements of synthetic fused silica

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dc.creatorLeviton, Douglas B.
dc.creatorFrey, Bradley J.
dc.date2008-05-01
dc.date.accessioned2026-07-07T09:36:24Z
dc.date.available2026-07-07T09:36:24Z
dc.descriptionUsing the Cryogenic, High-Accuracy Refraction Measuring System (CHARMS) at NASA's Goddard Space Flight Center, we have measured the absolute refractive index of five specimens taken from a very large boule of Corning 7980 fused silica from temperatures ranging from 30 to 310 K at wavelengths from 0.4 to 2.6 microns with an absolute uncertainty of +/-1 x 10^-5. Statistical variations in derived values of the thermo-optic coefficient (dn/dT) are at the +/-2 x 10^-8/K level. Graphical and tabulated data for absolute refractive index, dispersion, and thermo-optic coefficient are presented for selected wavelengths and temperatures along with estimates of uncertainty in index. Coefficients for temperature-dependent Sellmeier fits of measured refractive index are also presented to allow accurate interpolation of index to other wavelengths and temperatures. We compare our results to those from an independent investigation (which used an interferometric technique for measuring index changes as a function of temperature) whose samples were prepared from the same slugs of material from which our prisms were prepared in support of the Kepler mission. We also compare our results with sparse cryogenic index data from measurements of this material from the literature.
dc.description11 pages
dc.identifierhttps://arxiv.org/abs/0805.0091
dc.identifierhttp://arxiv.org/abs/0805.0091
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/160109
dc.subjectOptics
dc.titleTemperature-dependent absolute refractive index measurements of synthetic fused silica
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