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Applied Optics

Applied Optics


  • Vol. 30, Iss. 25 — Sep. 1, 1991
  • pp: 3656–3660

Interferometric method for concurrent measurement of thermo-optic and thermal expansion coefficients

John M. Jewell, Charles Askins, and Ishwar D. Aggarwal  »View Author Affiliations

Applied Optics, Vol. 30, Issue 25, pp. 3656-3660 (1991)

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A Fabry–Perot-type interferometer is described that permits the concurrent measurement of the coefficient of thermal expansion (α) and the thermooptic coefficient (dn/dT) of transparent materials. Measurements of the a and the dn/dT of vitreous silica and a heavy-metal fluoride glass show that the technique is accurate, reproducible, and easily performed. In addition, the technique is used to show that the dn/dT of heavy-metal fluoride glasses is negative and temperature dependent. The magnitude of dn/dT is found to increase with increasing temperature.

© 1991 Optical Society of America

Original Manuscript: April 23, 1990
Published: September 1, 1991

John M. Jewell, Charles Askins, and Ishwar D. Aggarwal, "Interferometric method for concurrent measurement of thermo-optic and thermal expansion coefficients," Appl. Opt. 30, 3656-3660 (1991)

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