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1. 发明申请

US20010001944A1 Single crystal of lithium niobate or tantalate and its optical element, and process and apparatus for producing an oxide single crystal 有权
标题翻译：铌酸锂或钽酸锂的单晶及其光学元件，以及用于生产氧化物单晶的工艺和设备
公开(公告)号：US20010001944A1
公开(公告)日：2001-05-31
申请号：US09754187
申请日：2001-01-05
申请人： NATIONAL INSTITUTE FOR RESEARCH IN INORGANIC MATERIALS
发明人： Kenji Kitamura , Yasunori Furukawa , Shunji Takekawa , Shigeyuki Kimura
IPC分类号： C30B015/00
CPC分类号： C30B15/12 , C30B15/00 , C30B29/30 , Y10T117/10
摘要： A single crystal of lithium niobate or tantalate, grown from a melt of a composition having an excessive Li over its stoichiometric composition, and having a molar fraction of Li2O/(Nb2O5nullLi2O) or Li2O/ (Ta2O5nullLi2O) within a range of at least 0.490 and less than 0.500, wherein at least one element selected from the group consisting of Mg, Zn, Sc and In is contained in an amount of from 0.1 to 3.0 mol % based on the total amount of the at least one element, Nb and Li, or the total amount of the at least one element, Ta and Li. A process for producing an oxide single crystal by rotation pulling by means of a double crucible made of a noble metal, consisting of an outer crucible made of a noble metal, and a cylindrical inner crucible for intersecting the surface of a melt in the outer crucible and connecting the melt at the bottom of the melt, which process comprises pulling a single crystal from the inner crucible while directly measuring the weight of the growing crystal for growing, simultaneously supplying a gas into a closed container, supplying a powder material preserved in the closed container between the outer crucible and the inner crucible through a supply tube in the same amount by weight as the crystal growth, and growing the crystal by rotating the double crucible.
摘要翻译：从具有超过其化学计量组成的具有过量的Li的组合物的熔体生长并且具有Li 2 O /（Nb 2 O 5 + Li 2 O）或Li 2 O /（Ta 2 O 5 + Li 2 O）的摩尔分数的铌酸锂或钽酸锂的单晶，至少0.490且小于0.500，其中选自Mg，Zn，Sc和In中的至少一种元素的含量相对于至少一种元素的总量为0.1至3.0mol％ Nb和Li，或至少一种元素Ta和Li的总量。通过由贵金属制成的双坩埚通过旋转拉制制造氧化物单晶的方法，由贵金属制的外坩埚和用于与外坩埚中的熔体表面相交的圆柱形内坩埚并且将熔体连接在熔体的底部，该方法包括从内坩埚中拉出单晶，同时直接测量生长晶体的重量，同时将气体供应到密闭容器中，供应保存在熔体中的粉末材料通过供给管与外坩埚和内坩埚之间的密封容器的重量与晶体生长量相同，并且通过旋转双坩埚使晶体生长。

2. 发明申请

US20020033993A1 Optically functional device, single crystal substrate for the device and method for its use 有权
标题翻译：光功能器件，单晶衬底的器件及其使用方法
公开(公告)号：US20020033993A1
公开(公告)日：2002-03-21
申请号：US09796594
申请日：2001-03-02
申请人： National Institute for Research in Inorganic Materials
发明人： Yasunori Furukawa , Kenji Kitamura , Shunji Takekawa , Masaru Nakamura
IPC分类号： G02F001/35
CPC分类号： G02F1/3558 , G02F1/3775 , G02F2202/20
摘要： An optically functional device comprising a ferroelectric single crystal substrate and polarization-inverted structures formed at portions of the substrate at a temperature of not higher than the Curie temperature by an electron beam scanning irradiation method or a voltage application method and designed to control light passed through the polarization-inverted portions, wherein a LiTaO3 crystal having a molar ratio of Li/Ta within a range of from 0.95 to 1.02, is used as the substrate, so that the propagation loss of light passed through the polarization-inverted portions immediately after formation of the polarization-inverted structures, is not more than 2%.
摘要翻译：一种光功能元件，其特征在于，具有强电介质单晶基板和通过电子束扫描照射法或电压施加方法在不高于居里温度的温度下在基板的部分形成的偏振反转结构，并设计成控制通过的光偏振反转部分，其中使用Li / Ta摩尔比在0.95〜1.02的范围内的LiTaO 3晶体作为基板，使得在形成之后立即通过偏振反转部分的光的传播损耗的极化反转结构不大于2％。

3. 发明申请

US20020024716A1 Optically functional device, single crystal substrate for the device and method for its use 有权
标题翻译：光功能器件，单晶衬底的器件及其使用方法
公开(公告)号：US20020024716A1
公开(公告)日：2002-02-28
申请号：US09797596
申请日：2001-03-05
申请人： National Institute for Research in Inorganic Materials
发明人： Yasunori Furukawa , Kenji Kitamura , Shunji Takekawa , Masaru Nakamura
IPC分类号： G02F001/35
CPC分类号： G02F1/0027 , G02F1/292 , G02F1/3534 , G02F1/3558 , G02F1/3775 , G02F1/39 , G02F2202/20
摘要： An optically functional device comprising a ferroelectric single crystal substrate and polarization-inverted structures formed at portions of the substrate at a temperature of not higher than the Curie temperature by an electron beam scanning irradiation method or a voltage application method and designed to control light passed through the polarization-inverted portions, wherein a LiNbO3 crystal having a molar ratio of Li/Nb within a range of from 0.95 to 1.01, is used as the substrate, so that the propagation loss of light passed through the polarization-inverted portions immediately after formation of the polarization-inverted structures, is not more than 2%.
摘要翻译：一种光功能元件，其特征在于，具有强电介质单晶基板和通过电子束扫描照射法或电压施加方法在不高于居里温度的温度下在基板的部分形成的偏振反转结构，并设计成控制通过的光使用其中Li / Nb的摩尔比在0.95〜1.01的范围内的LiNbO 3晶体作为基板，使得在形成之后立即通过偏振反转部分的光的传播损耗为偏振反转部分的极化反转结构不大于2％。

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