Room‐temperature optical absorption in undoped &agr;‐Al2O3
作者:
M. E. Innocenzi,
R. T. Swimm,
M. Bass,
R. H. French,
A. B. Villaverde,
M. R. Kokta,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 67,
issue 12
页码: 7542-7546
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.345817
出版商: AIP
数据来源: AIP
摘要:
Optical absorption over a large dynamic range obtained by two different experimental techniques is reported for an undoped &agr;‐Al2O3single crystal. Absorption data are presented in two energy ranges: 0.94–3.5 eV and 4.5–8.6 eV. Vacuum ultraviolet (vuv) absorption measurements were performed on three boules of Czochralski‐grown single‐crystal Al2O3with differing starting material purities. The initial powder purities were 99.99%, 99.999%, and 99.999999%. In addition to the vuv measurements, calorimetric absorption results obtained in the visible and near‐infrared (ir) are presented. An empirical formula is obtained that provides an estimate of the absorption coefficient from the near‐ir to the vuv for undoped Al2O3. Detailed impurity analyses and sample histories are given for the optical‐quality &agr;‐Al2O3utilized herein.
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