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Photorefractive Properties of Cobalt-Doped Barium Titanate

Published online by Cambridge University Press:  21 February 2011

J. Y. Chang ,
M. H. Garrett ,
H. P. Jenssen ,
C. Warde  and
P. Tayebati
J. Y. Chang
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Rm 10–372F, Cambridge, MA 02139
M. H. Garrett
Affiliation:
Center for Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Rm 10–372F, Cambridge, MA 02139
H. P. Jenssen
Affiliation:
Center for Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Rm 10–372F, Cambridge, MA 02139
C. Warde
Affiliation:
Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Ave., Rm 10–372F, Cambridge, MA 02139
P. Tayebati
Affiliation:
Foster Miller, Inc., 350 Second Ave., Waltham, MA 02154
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Abstract

A series of cobalt-doped barium titanate crystals were grown that have high beam-coupling gain. Our photorefractive characterization shows that with increasing cobalt concentration in the crystal a deep level is formed and the relative effect of shallow levels on the space-charge field amplitude diminishes. This gives the crystal a long dark storage time. We find that cobalt-doping in barium titanate increases the two-beam coupling gain by reducing the dark conductivity and increasing the total effective trap density.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 228: Symposium N – Materials for Optical Information Processing , 1991 , 157
Copyright
Copyright © Materials Research Society 1992

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References

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