Development of a twyman-green interferometer capable of measuring the thermal properties of optical materials

William E. Green, James A. Corsetti, Greg R. Schmidt, Duncan T. Moore, Jonathan D. Ellis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

When the temperature of an optical element changes, both its physical dimensions as well as its index of refraction change as a result. When designing an optical system that operates across a broad range of temperatures, knowledge of these thermal properties is critical. An interferometric method is presented for simultaneously measuring both the coefficient of thermal expansion (CTE) and the temperaturedependent refractive index (dn/dT) of materials in air. Any instrument that characterizes temperature-dependent properties must itself be largely insensitive to those same temperature changes. The design and realization of such an interferometer is detailed, highlighting the methods used for mitigating vibrations and undesirable temperature gradients. A discussion of measurement results on a Mitutoyo steel gauge block and CaF2 is also included.

Original languageEnglish (US)
Title of host publicationProceedings - ASPE 2016 Annual Meeting
PublisherAmerican Society for Precision Engineering, ASPE
Pages209-214
Number of pages6
ISBN (Electronic)9781887706728
StatePublished - Jan 1 2016
Externally publishedYes
Event31st Annual Meeting of the American Society for Precision Engineering, ASPE 2016 - Portland, United States
Duration: Oct 23 2016Oct 28 2016

Publication series

NameProceedings - ASPE 2016 Annual Meeting

Conference

Conference31st Annual Meeting of the American Society for Precision Engineering, ASPE 2016
CountryUnited States
CityPortland
Period10/23/1610/28/16

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Mechanical Engineering

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  • Cite this

    Green, W. E., Corsetti, J. A., Schmidt, G. R., Moore, D. T., & Ellis, J. D. (2016). Development of a twyman-green interferometer capable of measuring the thermal properties of optical materials. In Proceedings - ASPE 2016 Annual Meeting (pp. 209-214). (Proceedings - ASPE 2016 Annual Meeting). American Society for Precision Engineering, ASPE.