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Proceedings Paper

Effect Of Point Defects On High-Temperature Optical Properties In Transparent Polycrystalline Lanthana-Doped Yttria
Author(s): G. C. Wei; C. Brecher; W. H. Rhodes
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Paper Abstract

The effect of point defects on absorption in transparent polycrystalline lanthana-doped yttria was investigated by measuring the absorption coefficient as a function of temperature and oxygen partial pressure P02 at two wavelengths (0.357 and 3.39 μm). The composition of the specimens was controlled by preannealing at 1400°C in appropriate oxygen pressures ranging from 10-16 to 10-5 atm. The technique used for determining the absorption coefficient consisted of measuring the transmittance of two samples of different thicknesses. The absorption at 0.357 μm showed a sharp increase with temperature beginning at about 1000°C. The magnitude of this increase was a function of P02. A broad minimum was found in the high-temperature absorption at 1400°C, ranging from 10-13 to 10-10 atm P02; this represents the stoichiometry range. Initial absorption measurements in the infrared (3.39 μm) indicated much less temperature dependence, with little or no absorption increase above 1000°C at 3 x 10-13 atm P02 and only a small increase at 2 x 10-3 atm P02. Also reported in this paper are other optical properties, including refractive index, temperature coefficient of refractive index, and scattering in lanthana-doped yttria.

Paper Details

Date Published: 19 December 1986
PDF: 7 pages
Proc. SPIE 0683, Infrared and Optical Transmitting Materials, (19 December 1986); doi: 10.1117/12.936430
Show Author Affiliations
G. C. Wei, GTE Laboratories Inc. (United States)
C. Brecher, GTE Laboratories Inc. (United States)
W. H. Rhodes, GTE Laboratories Inc. (United States)


Published in SPIE Proceedings Vol. 0683:
Infrared and Optical Transmitting Materials
Robert W. Schwartz, Editor(s)

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