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Effect of nonstoichiometry on the terahertz absorption of Y3Al5O12 optical ceramics

Published online by Cambridge University Press:  09 September 2014

Romain Gaume ,
Daniel Steere  and
S.K. Sundaram
Romain Gaume*
Affiliation:
The College of Optics & Photonics (CREOL), University of Central Florida, Orlando, FL 32816, USA
Daniel Steere
Affiliation:
Terahertz and Millimeter Wave Laboratory (T-Lab), Kazuo Inamori School of Engineering, New York State College of Ceramics at Alfred University, Alfred, NY 14802, USA
S.K. Sundaram
Affiliation:
Terahertz and Millimeter Wave Laboratory (T-Lab), Kazuo Inamori School of Engineering, New York State College of Ceramics at Alfred University, Alfred, NY 14802, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

We report the effect of nonstoichiometry on the terahertz absorption of fully dense optical ceramics of Y3Al5O12 and compare to that of undoped and 1 at.% Nd3+ doped single crystals. Our research is motivated primarily by the necessity of having better control of stoichiometry during the preparation of transparent yttrium aluminum garnet (YAG) ceramics. A set of twenty ceramic samples was prepared by solid-state sintering of Y2O3 and Al2O3 powder mixtures with compositions ranging from −0.62 to +0.96 mol% of Y2O3 on each side of the stoichiometric garnet composition. After sintering, the samples were highly translucent in the visible range, with attenuations better than 2 cm−1. These samples were characterized using time-domain terahertz spectroscopy between 0.06 and 2.8 THz. Ceramic and single-crystal samples exhibit a similar broad absorption band, which we assign to a 2-phonon difference process, and whose width and intensity depend upon composition.

Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 19: Focus Issue: Optical Ceramics Science , 14 October 2014 , pp. 2338 - 2343
Copyright
Copyright © Materials Research Society 2014 

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References

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