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Refractive-index dispersion for BaF2-GdF3-ZrF4-AlF3 glasses.

S Mitachi1, T Miyashita

  • 1NTT Ibaraki Electrical Communication Laboratory, Tokai, Ibaraki-ken 319-11, Japan.

Applied Optics
|August 15, 1983
PubMed
Summary

This study measured refractive-index dispersion in fluoride glasses, finding that AlF3 concentration and dopants like LiF and PbF2 alter the zero material dispersion wavelength. Temperature also affects this critical optical property.

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Area of Science:

  • Materials Science
  • Optical Materials
  • Glass Science

Background:

  • Fluoride glasses are crucial optical materials, but their refractive-index dispersion characteristics require detailed investigation for applications.
  • Understanding material dispersion and zero material dispersion wavelength (lambda(0)) is essential for designing optical components, especially in the infrared region.

Purpose of the Study:

  • To measure refractive-index dispersion in AlF3-doped and various cation-doped fluoride glasses.
  • To determine the material dispersion curve and zero material dispersion wavelength (lambda(0)) for these glasses.
  • To investigate the effect of AlF3 concentration, dopant type, and temperature on lambda(0).

Main Methods:

  • Refractive-index dispersion measurements were conducted on bulk fluoride glass specimens across a wide wavelength range (0.4047 to 5.3036 microm).
  • Material dispersion curves and lambda(0) were calculated from the refractive-index dispersion data.
  • Temperature dependence of refractive index and material dispersion was analyzed for a specific fluoride glass composition.

Main Results:

  • The slope of the material dispersion curve for the studied fluoride glasses was less steep than that of SiO2 glass.
  • Increasing AlF3 concentration shifted lambda(0) to shorter wavelengths, with lambda(0) = 1.675 microm for 4-mol% AlF3 doped glass.
  • Doping with LiF, CsF, YF3, CdF2, SnF2, or PbF2 resulted in lambda(0) values ranging from 1.668 to 1.704 microm.
  • The refractive index temperature coefficients were negative (dn/dT = -1.0 x 10(-5)/degrees C) with minimal wavelength dependence.
  • An increase in temperature from 25 degrees C to 250 degrees C shifted lambda(0) from 1.675 to 1.605 microm.

Conclusions:

  • The refractive-index dispersion and material dispersion of these fluoride glasses are tunable via AlF3 concentration and specific dopants.
  • The observed temperature dependence of refractive index and material dispersion is significant and must be considered for optical device stability.
  • These findings provide valuable data for the selection and design of fluoride glasses in optical applications sensitive to dispersion and temperature.