Doubly doped lithium niobate crystals
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Dec 28, 2004
Grant Date -
Jan 24, 2002
app pub date -
Jun 18, 2001
filing date -
Jul 20, 2000
priority date (Note) -
Expired
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Abstract
This invention relates to the field of materials of the photorefractive crystal. The composition of these crystals is Li.sub.1-x Nb.sub.1+y O.sub.3 : Fe.sub.m, M.sub.n, where M can be magnesium, indium, or zinc; when using q to denote the ion valence of M (q=2 when M is Mg or Zn, and q=3 when M is In), the values of x, y, m, and n are in the range of 0.05.ltoreq.x.ltoreq.0.13, 0.00.ltoreq.y.ltoreq.0.01, 5.0.times.10.sup.-5.ltoreq.m.ltoreq.7.5.times.10.sup.-4, and 0.02.ltoreq.qn.ltoreq.0.13. This invention greatly improves the photorefractive properties of LiNbO.sub.3 crystals: makes it have a high diffraction efficiency (more than 68%), a fast response speed for photorefraction (an order of magnitude faster than iron doped LiNbO.sub.3), and a high resistance to optical scattering (the light intensity threshold to photorefractive fan scattering near two orders of magnitude larger than LiNbO.sub.3 : Fe). This invention is an excellent three-dimensional optical storage material and has a vast potential market.
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