Measurement of the temperature-dependent refractive index and relative photoelastic constant of zinc sulfide

David W. Blodgett; Di Yang; Suzanne C. Walts; Michael E. Thomas

doi:10.1117/12.439179

7 September 2001 Measurement of the temperature-dependent refractive index and relative photoelastic constant of zinc sulfide

David W. Blodgett, Di Yang, Suzanne C. Walts, Michael E. Thomas

Author Affiliations +

Proceedings Volume 4375, Window and Dome Technologies and Materials VII; (2001) https://doi.org/10.1117/12.439179
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

Abstract

High quality measurements of the refractive index of Cleartran Zinc Sulfide at different temperatures over a wide frequency range are reported. The simplest expression of temperature dependence is the derivative of refractive index with respect to temperature, i.e. the thermo-optic coefficient. A convenient method for determining refractive index is measuring constructive or destructive interference between surfaces of a thick lamina that produce transmission peaks. Such transmittance measurements, made at several temperatures, along with knowledge of the sample thickness provide a comprehensive picture of the temperature-dependent refractive index. Results from these measurements show that ZnS has a dn/dT between 3x10^-5 and 5.5x10^-5 depending on temperature and wavelength. In addition, photoelastic measurements on both thin and thick samples in the visible and mid-IR region show ZnS to have a relative photoelastic constant of about 1.2x10^-11m²/N.

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David W. Blodgett, Di Yang, Suzanne C. Walts, and Michael E. Thomas "Measurement of the temperature-dependent refractive index and relative photoelastic constant of zinc sulfide", Proc. SPIE 4375, Window and Dome Technologies and Materials VII, (7 September 2001); https://doi.org/10.1117/12.439179

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