The thermal expansion and temperature dependence of the refractive index in gradient-index glass have been investigated. In an earlier paper [
P. O. McLaughlin and D. T. Moore, “
Models for the Thermal Expansion Coefficient and Temperature Coefficient of the Refractive Index in Gradient Index Glass,”
Appl. Opt. 24, this issue (
15 Dec. 1985)] these two thermal properties were modeled as functions of the local glass composition within the gradient-index region. In this paper measurements of αL and dn/dT are described. A modified multiple Fabry-Perot interferometer was designed and built into an environmental temperature chamber to measure these thermal properties in gradient-index glass in the 0–100°C range. The interferometer operated under computer control to measure optically the differential thermal expansion and change in refractive-index profile in several samples of gradient-index glass.
© 1985 Optical Society of America
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