Photorefractive material
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United States of America Patent
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Dec 30, 2003
Grant Date -
N/A
app pub date -
Jun 21, 2000
filing date -
Jun 24, 1999
priority date (Note) -
Expired
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Abstract
A photorefractive material provides a high photosensitivity without reduction. The material comprises a single crystal of terbium (Tb)-doped niobate or tantalate. The single crystal is a single crystal of lithium niobate (LiNbO.sub.3) whose molar fraction of [Li.sub.2 O]/([Li.sub.2 O]+[Nb.sub.2 O.sub.5 ]) lies in a range of 0.482 to 0.505, or a single crystal of lithium tantalate (LiTaO.sub.3) whose molar fraction of [Li.sub.2 O]/([Li.sub.2 O]+[Ta.sub.2 O.sub.5 ]) lies in a range of 0.482 to 0.505. The amount of terbium added in the photorefractive material ranges from 10 weight ppm to 1000 weight ppm.
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