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Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
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Photoelastic Constants of Ruby.

R M Waxler1, E N Farabaugh1

  • 1Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
|June 12, 2020
PubMed
Summary
This summary is machine-generated.

This study determined the piezo-optic and elasto-optic constants for synthetic ruby crystals. Findings suggest changes in oxygen ion polarizability and local fields drive refractive index alterations under stress.

Keywords:
Birefringencecrystals, lasersphotoelasticityruby

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Area of Science:

  • Solid-state physics
  • Crystallography
  • Optics

Background:

  • Piezo-optic and elasto-optic effects describe how a material's refractive index changes under applied stress.
  • Understanding these properties is crucial for optical device design and material science.
  • Synthetic single crystal ruby is a key material in various optical applications.

Purpose of the Study:

  • To comprehensively determine the eight piezo-optic and eight elasto-optic constants of synthetic single crystal ruby.
  • To investigate the influence of hydrostatic pressure on the photoelastic properties of ruby.
  • To introduce a novel device for applying high uniaxial stress.

Main Methods:

  • Utilized cadmium red radiation (643.8 nm) for precise optical measurements.
  • Applied hydrostatic pressure for the first time in a complete photoelastic investigation.
  • Developed and employed a new screw-clamp device for generating high uniaxial stress.

Main Results:

  • All determined piezo-optic and elasto-optic constants were found to be negative or very small positive values.
  • The study identified changes in oxygen ion polarizability and local field effects as primary drivers of refractive index changes.
  • Successfully demonstrated the utility of hydrostatic pressure and the new uniaxial stress device.

Conclusions:

  • The determined optical constants provide critical data for modeling ruby's photoelastic behavior.
  • The findings elucidate the fundamental mechanisms (polarizability and local field changes) governing stress-induced refractive index variations in ruby.
  • The developed methodology and apparatus offer new possibilities for photoelastic investigations.