Armstrong, Kratz, Quintos, Hanson & Brooks, LLP
Doubly doped lithium niobate crystals
This invention relates to the field of materials of the photorefractive crystal. The composition of these crystals is Li1&#8722;xNb1+yO3: Fem, Mn, 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&lE;x&lE;0.13, 0.00&lE;y&lE;0.01, 5.0&times;10&#8722;5&lE;m&lE;7.5&times;10&#8722;4, and 0.02&lE;qn&lE;0.13. This invention greatly improves the photorefractive properties of LiNbO3 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 LiNbO3), and a high resistance to optical scattering (the light intensity threshold to photorefractive fan scattering near two orders of magnitude larger than LiNbO3: Fe). This invention is an excellent three-dimensional optical storage material and has a vast potential market.
Nankai University
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G11B G11C C01P G11B C01G C01P C01G G11B
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Ziheng Qian Guangyin Baiquan Shaolin Jingjun Hui Xiaojun Yongfa Guangao
Huang Sun Zhang Tang Chen Xu Huang Chen Kong Li