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1. 发明授权

US5547613A Magneto-optical element material formed of magnetic garnet single crystals 失效
标题翻译：由磁性石榴石单晶形成的光电元件材料
公开(公告)号：US5547613A
公开(公告)日：1996-08-20
申请号：US498226
申请日：1995-07-05
申请人： Hirotaka Kawai , Shinzo Fujii , Hiromitsu Umezawa
发明人： Hirotaka Kawai , Shinzo Fujii , Hiromitsu Umezawa
IPC分类号： G02F1/09 , C30B15/00 , C30B29/28 , G02F1/00 , H01F10/24 , G02B5/20 , C01F17/00
CPC分类号： H01F10/245 , C30B15/00 , C30B29/28 , G02F1/0036
摘要： A material made of magnetic garnet single crystals has excellent characteristics particularly in a wavelength band of from 950 to 1070 nm, which is usable for a wavelength 980 nm for pumping light of erbium doped fiber amplifier, and for a wavelength of 1017 nm for pumping light of an praseodymium doped fiber amplifier. One example of the material is made of magnetic garnet single crystals expressed by a composition formula of Nd.sub.3-x Bi.sub.x Fe.sub.5 O.sub.12 (0.5.ltoreq.x.ltoreq.1.9), the single crystals being formed by liquid-phase epitaxial growth on a non-magnetic garnet substrate having a lattice constant specified in the range of 12.61 .ANG..ltoreq.a.ltoreq.12.63 .ANG.. The material is suitably used for a magneto-optical element having a wavelength band from 950 to 1070 nm. The non-magnetic garnet substrate can be made of a material having a composition formula expressed by Gd.sub.3-y Nd.sub.y Sc.sub.2 Ga.sub.3 O.sub.12 (1.0.ltoreq.y.ltoreq.1.4).
摘要翻译：由石榴石单晶制成的材料具有优异的特性，特别是在波长为950〜1070nm的波长带中，其可用于掺铒光纤放大器的泵浦光的波长980nm，泵浦光的波长为1017nm 的镨掺杂光纤放大器。材料的一个例子是由Nd3-xBixFe5O12（0.5≤x= 1.9）的组成式表示的磁性石榴石单晶制成，单晶通过非磁性石榴石上的液相外延生长形成具有在12.61安培范围内规定的晶格常数的基板

2. 发明授权

US07336418B1 Optical attenuator 有权
标题翻译：光衰减器
公开(公告)号：US07336418B1
公开(公告)日：2008-02-26
申请号：US09959671
申请日：2000-06-16
申请人： Hirotaka Kawai , Hiromitsu Umezawa , Isao Kojima , Hidenori Nakata , Teruhisa Sahashi
发明人： Hirotaka Kawai , Hiromitsu Umezawa , Isao Kojima , Hidenori Nakata , Teruhisa Sahashi
IPC分类号： G02B5/30
CPC分类号： G02B27/281 , G02F1/093 , G02F2203/48
摘要： An optical attenuator with increased dynamic range and reduced temperature-dependence over the dynamic range. The optical attenuator has a Faraday rotational angle variable device which applies an external magnetic field to light polarized by a garnet crystal, and a polarizer and an analyzer disposed at the front and rear of the optical axis of the device. There is an angle x formed between the plane of polarization of the light incident to the garnet crystal and the magnetic field orthogonal to the optical axis, where an angle y is formed between the polarizer and the analyzer, and the angle x is set to satisfy {(−z/2)+90×n}−12
摘要翻译：光衰减器具有动态范围的增加，并且在动态范围内降低了温度依赖性。光衰减器具有法拉第旋转角可变装置，其对由石榴石晶体偏振的光施加外部磁场，偏振器和分析器设置在装置的光轴的前后。在入射到石榴石晶体的光的偏振面和与光轴正交的磁场之间形成有角度x，其中在偏振器和分析器之间形成角度y，并且将角度x设定为满足 {（-z / 2）+ 90xn} -12

3. 发明授权

US06288827B1 Faraday rotator 有权
标题翻译：法拉第旋转器
公开(公告)号：US06288827B1
公开(公告)日：2001-09-11
申请号：US09259039
申请日：1999-02-26
申请人： Hirotaka Kawai , Hiromitsu Umezawa , Hidenori Nakada , Nobuhiro Fukushima
发明人： Hirotaka Kawai , Hiromitsu Umezawa , Hidenori Nakada , Nobuhiro Fukushima
IPC分类号： G02F109
CPC分类号： G02F1/09 , G02F1/093 , G02F2203/21
摘要： Disclosed is a Faraday rotator capable of reducing the temperature dependence on a Faraday rotation angle, thereby enhancing the temperature characteristic, particularly, in a service environment in which the magnetization direction is variable, and an optical device using the Faraday rotator. The Faraday rotator includes a Faraday element which rotates the polarization plane of polarized light rays passing through the Faraday element when an external magnetic field is applied to the Faraday element. In this Faraday rotator, assuming that an angle between a magnetization direction of the Faraday element and a light ray direction is taken as &agr;, the amount of the temperature-dependent change in Faraday rotation angle is reduced by applying the external magnetic field in a direction in which a first amount of the change in Faraday rotation angle due to the temperature dependence on the angle &agr; and a second amount of the change in Faraday rotation angle due to the temperature dependence on the Faraday effect satisfy a relationship in which the sign of the first amount is plus or minus, the sign of the second amount is minus or plus, and the absolute value of one of the first and second amounts is less than twice the absolute value of the other amount, more preferably, substantially equal to the absolute value of the other amount.
摘要翻译：公开了能够降低与法拉第旋转角度的温度依赖性的法拉第旋转器，从而提高温度特性，特别是在磁化方向可变的使用环境中，以及使用法拉第旋转器的光学装置。法拉第旋转器包括法拉第元件，当外部磁场施加到法拉第元件时，该法拉第元件使通过法拉第元件的偏振光的偏振面旋转。在该法拉第旋转器中，假设法拉第元件的磁化方向与光线方向之间的角度为α，则法拉第旋转角度的温度依赖的变化量通过将外部磁场施加在方向其中由于对角度α的温度依赖性而导致的法拉第旋转角度的第一量的变化以及由于对法拉第效应的温度依赖性而产生的法拉第旋转角度的第二量的变化满足关系，其中，第一数量是正负号，第二数量的符号是负数或正数，第一和第二数量之一的绝对值小于其他量的绝对值的两倍，更优选地基本上等于绝对值其他金额的价值。

4. 发明授权

US5965287A Magneto-optical element material and Faraday element using the same 失效
标题翻译：磁光元件材料和使用它的法拉第元件
公开(公告)号：US5965287A
公开(公告)日：1999-10-12
申请号：US959214
申请日：1997-10-28
申请人： Toshiyasu Suzuki , Hirotaka Kawai , Hiromitsu Umezawa
发明人： Toshiyasu Suzuki , Hirotaka Kawai , Hiromitsu Umezawa
IPC分类号： H01F1/34 , G11B5/66
CPC分类号： H01F1/346 , Y10S428/90
摘要： Disclosed is a magneto-optical element material composed of a magnetic garnet single crystal which is small in temperature dependency of a Faraday rotation angle, capable of being formed into a film by the LPE, and significantly small in wavelength dependency of a Faraday rotation angle in a specific composition region defined by. The magneto-optical element material is composed of a magnetic garnet single crystal expressed by a composition formula of R.sub.3-x Bi.sub.x Fe.sub.5-v-w-y Ma.sub.v Mb.sub.w Co.sub.y O.sub.12 where R indicates a rare earth element including yttrium, Ma is a trivalent cationic element, and Mb is a tetravalent cationic element; and x, y, v and w satisfy relationships of 0.6.ltoreq.x.ltoreq.1.9, 0.01.ltoreq.y.ltoreq.0.47, 260y-88x+45.ltoreq.0, 500y-30x+37.ltoreq.0, 0.ltoreq.v.ltoreq.1.0, and 0.ltoreq.w.ltoreq.0.35. The material satisfying the following relationships of 0.01.ltoreq.y.ltoreq.0.28 and 800y-130x+45.ltoreq.0 specifically shows improvement in a wavelength dependency of a Faraday rotation angle. Further disclosed is a Faraday element formed by superimposing an A film on a B film for broadening a usable wavelength band region using difference in wavelength dependency of a Faraday rotation coefficient between both the films A and B. The A film is made, by the LPE, from a Bi-substitution type rare earth-iron garnet single crystal not containing Co and the B film is made, by the LPE, from a rare earth-iron garnet single crystal containing Co.
摘要翻译：公开了一种磁光元件材料，其由能够由LPE形成膜的法拉第旋转角的温度依赖性小的石榴石单晶组成，并且法拉第旋转角度的波长依赖性显着小一个特定的组成区域。磁光元件材料由组成式R3-xBixFe5-vw-yMavMbwCoyO12表示的磁性石榴石单晶组成，其中R表示包括钇的稀土元素，Ma是三价阳离子元素，Mb是四价阳离子元件; 并且x，y，v和w满足0.6≤x≤1.0,0.01≤y≤0.47,260y-88x +45≤0,500y-30x + 37.0的关系，0≤v≤0.0，0≤w≤0.35。满足0.01≤y≤0.28和800y-130x + 45.0的以下关系的材料具体示出了法拉第旋转角度的波长依赖性的改善。进一步公开的是通过在B膜上叠加A膜而形成的法拉第元件，用于使两个膜A和B之间的法拉第旋转系数的波长依赖性的差异使可使用的波长带区域变宽.A膜由LPE 来自不含Co的Bi取代型稀土铁石榴石单晶和B膜由LPE由含稀土铁石榴石单晶的Co制成

5. 发明授权

US06417952B1 Faraday rotation angle varying device 有权
标题翻译：法拉第旋转角度变化装置
公开(公告)号：US06417952B1
公开(公告)日：2002-07-09
申请号：US09573850
申请日：2000-05-19
申请人： Hirotaka Kawai , Hiromitsu Umezawa
发明人： Hirotaka Kawai , Hiromitsu Umezawa
IPC分类号： G02F109
CPC分类号： B82Y25/00 , G02F1/09 , G02F2201/16 , H01F10/245 , H01F10/3209
摘要： There is provided a Faraday rotation angle varying device in which external magnetic fields are applied from at least two directions to a garnet single crystal having a Faraday effect and a synthesized magnetic field is varied so that Faraday rotation angle of light which transmits through the garnet single crystal is controlled. The device has a base film of garnet single crystal having a rotation angle varied in accordance with variation of a synthesized magnetic field, and a compensating film of a garnet single crystal having a constant Faraday rotation angle. The base film has a wavelength coefficient sign and the compensating film has a wavelength coefficient sign which is different from that of the base film, so that a wavelength variation component of the Faraday rotation angle of the base film is reduced by the compensating film. For example, a fixed magnetic field parallel to a light direction is applied by permanent magnets and a variable magnetic field is applied by an electromagnet.
摘要翻译：提供了一种法拉第旋转角度变化装置，其中外部磁场从至少两个方向施加到具有法拉第效应的石榴石单晶，并且合成磁场变化，使得通过石榴石单透镜的光的法拉第旋转角度晶体被控制。该装置具有根据合成磁场的变化而变化的旋转角度的石榴石单晶基膜和具有恒定法拉第旋转角度的石榴石单晶的补偿膜。基膜具有波长系数符号，并且补偿膜具有与基膜不同的波长系数符号，从而通过补偿膜减小基膜的法拉第旋转角的波长变化分量。例如，通过永磁体施加平行于光方向的固定磁场，并且通过电磁体施加可变磁场。

6. 发明授权

US6108120A Faraday rotation angle varying apparatus 有权
标题翻译：法拉第旋转角度变化装置
公开(公告)号：US6108120A
公开(公告)日：2000-08-22
申请号：US139817
申请日：1998-08-25
申请人： Hirotaka Kawai , Hiromitsu Umezawa , Youichi Suzuki , Hidenori Nakada
发明人： Hirotaka Kawai , Hiromitsu Umezawa , Youichi Suzuki , Hidenori Nakada
IPC分类号： G02F1/01 , G02F1/09
CPC分类号： G02F1/092 , G02F2001/0139
摘要： A Faraday rotation angle varying apparatus for controlling a Faraday rotation angle of a light beam passing through a garnet single crystal having a Faraday effect by applying external magnetic fields to the garnet single crystal in two or more of directions and varying a synthetic magnetic field synthesized from the external magnetic fields is disclosed. According to an aspect of the present invention, the garnet single crystal has the (111) plane polished and the light beam is allowed to pass through the garnet single crystal along the direction of the garnet single crystal perpendicular to the (111) plane. A displacement path of a synthetic vector of the external magnetic fields is within a fan-shaped range (peripheral lines of the fan-shape inclusive) of a stereographic projection chart of the garnet single crystal with the (111) plane taken as the center of the chart. The fan-shaped range is surrounded by two lines connecting a point indicating the (111) plane positioned at the center of the stereographic projection chart to two positions apart 10.degree. rightward and leftward from a point indicating one of crystal planes equivalent to the (110) plane positioned on the outermost peripheral circle of the stereographic projection chart.
摘要翻译：一种法拉第旋转角度变化装置，用于通过在两个或更多个方向上对石榴石单晶施加外部磁场，并且改变由合成磁场合成的合成磁场，来控制通过具有法拉第效应的石榴石单晶的光束的法拉第旋转角度公开了外部磁场。根据本发明的一个方面，石榴石单晶具有抛光的（111）面，并使光束沿垂直于（111）的石榴石单晶的<111>方向通过石榴石单晶，飞机外部磁场的合成矢量的位移路径在以（111）面为中心的石榴石单晶的立体投影图的扇形范围（包括扇形的外围线）内图表。扇形范围由两条线组成，两条线连接指示位于立体投影图中心的（111）面的点与从表示与（110）相等的晶面之一的点向右和向左10度分离的两个位置）平面位于立体投影图的最外周圆上。

7. 发明授权

US5566017A Material for magneto-optical element and faraday rotator using the same 失效
标题翻译：用于磁光元件的材料和使用其的法拉第旋转器
公开(公告)号：US5566017A
公开(公告)日：1996-10-15
申请号：US510616
申请日：1995-08-03
申请人： Toshiyasu Suzuki , Hirotaka Kawai , Hiromitsu Umezawa
发明人： Toshiyasu Suzuki , Hirotaka Kawai , Hiromitsu Umezawa
IPC分类号： G02F1/00 , H01F10/24 , H01F10/32 , G02F1/09
CPC分类号： B82Y25/00 , G02F1/0036 , H01F10/245 , H01F10/3209 , Y10S372/702
摘要： Disclosed is a material for a magneto-optical element, which is made of magnetic garnet single crystals being wide in a band width in a 1310 nm band and thereby being capable of coping with the wavelength multiplex communication at the wavelength band, and a Faraday rotator using the same. The material for a magneto-optical element is made of a magnetic garnet having a composition formula expressed by R.sub.3-y-x Sm.sub.y Bi.sub.x Fe.sub.5 O.sub.12, where R is one kind of rare earth elements including yttrium (Y), and "x" and "y" are constants defined by 0.3.ltoreq.x.ltoreq.1.9 and 0.4.ltoreq.y.ltoreq.2.7, the magnetic garnet being formed on a non-magnetic substrate by liquid-phase epitaxial growth. R is preferably one of Y, La, Sm and Lu. The Faraday rotator, which is used in a wavelength range of from 1250 to 1370 nm, is formed by superposing a film A made of LPE magnetic garnet single crystals expressed by a composition formula of R1.sub.3-x Bi.sub.x Fe.sub.5-z Z.sub.z O.sub.12, to a film B made of LPE magnetic garnet single crystals expressed by a composition formula of R2.sub.3-y Sm.sub.y Fe.sub.5 O.sub.12, where R1 is one of Al, In of rare earth elements including Y; Z is one of Al, In and Ga; R2 is one kind of rare earth elements including Bi and Y; and "x", "y" and "z" are constants defined by 0.3.ltoreq.x.ltoreq.1.9, 0.5.ltoreq.y.ltoreq.3 and 0.ltoreq.z.ltoreq.0.5.
摘要翻译：公开了一种用于磁光元件的材料，其由在1310nm波段的带宽宽的磁石榴石单晶制成，从而能够应对在波长带处的波长多路复用通信，以及法拉第旋转器使用相同用于磁光元件的材料由具有由R3-y-xSmyBixFe5O12表示的组成式的磁性石榴石制成，其中R是包括钇（Y）在内的一种稀土元素，“x”和“y”是通过液相外延生长在非磁性衬底上形成的磁性石榴石由0.3

8. 发明授权

US07009767B2 Polarization separating/synthesizing element and optical device using it 失效
标题翻译：极化分离/合成元件和使用它的光学器件
公开(公告)号：US07009767B2
公开(公告)日：2006-03-07
申请号：US10415077
申请日：2001-10-03
申请人： Masaharu Hoshikawa , Hiromitsu Umezawa
发明人： Masaharu Hoshikawa , Hiromitsu Umezawa
IPC分类号： G02B27/28 , G02B5/30
CPC分类号： H04Q11/0005 , G02B6/2746 , G02B6/3548 , G02B6/3594 , G02B27/283 , G02B27/285 , G02F1/093 , G02F1/31 , G02F2203/07 , H04Q2011/0024 , H04Q2011/0058
摘要： A polarized-light separating/combining element is obtained which can suppress deviation in a direction of rays (angular error), reduce beam coupling loss and improve extinction ratio. Size reduction and loss lowering is achieved for an optical device (optical circulator or optical switch), to enable manufacture at a low cost and with ease. A polarized-light separating/combining element has a transparent member having flat surfaces parallel with each other on which both parallel surfaces, polarized-light separating/combining films are formed respectively, wherein both polarized-light separating/combining films are faced to air. By using the polarized-light separating/combining element, various kinds of optical devices (optical circulators or optical switches) can be formed. Particularly, it is effective for realizing a low crosstalk characteristic in a matrix optical switch.
摘要翻译：获得能够抑制光线方向偏离（角度误差）的偏振光分离/组合元件，减少光束耦合损耗并提高消光比。对于光学装置（光环行器或光开关）实现尺寸减小和损耗降低，以便以低成本和容易地制造。偏振光分离/组合元件具有彼此平行的平坦表面的透明构件，其中分别形成有两个平行表面，偏振光分离/组合膜，其中两个偏振光分离/组合膜都面对空气。通过使用偏振光分离/组合元件，可以形成各种光学器件（光学循环器或光学开关）。特别地，在矩阵式光开关中实现低串扰特性是有效的。

9. 发明授权

US07280264B2 Magneto-optical device 有权
公开(公告)号：US07280264B2
公开(公告)日：2007-10-09
申请号：US10569097
申请日：2004-08-26
申请人： Yuji Goto , Mikio Kitaoka , Hiromitsu Umezawa , Tsugio Tokumasu , Toshihiko Watanabe , Akitoshi Mesaki , Takashi Kato , Masaharu Hoshikawa , Chiharu Nishida
发明人： Yuji Goto , Mikio Kitaoka , Hiromitsu Umezawa , Tsugio Tokumasu , Toshihiko Watanabe , Akitoshi Mesaki , Takashi Kato , Masaharu Hoshikawa , Chiharu Nishida
IPC分类号： G02F1/09
CPC分类号： G02F1/09 , G02F1/093
摘要： It is possible to reduce the size of a magneto-optical device, increase the speed of optical control, simplify power supply structure and its control, and maintain a Faraday rotation angle in an arbitrary state even after shut-off of the excitation current. The magneto-optical device includes a magnetic yoke (10) made of a high-permeability magnetic material, the magnetic yoke including a tabular portion (16) and four pillar portions (18) protruding from one side of the tabular portion (16), a coil (12) wound on each of the pillar portions, and a magneto-optical element (14) arranged in an open-magnetic-circuit region surrounded by the end portions of the four pillar portions. A magnetic field obtained by a coil is applied to the magneto-optical element.

10. 发明申请

US20080218841A1 Magneto-Optical Device and Manufacturing Method thereof 失效
标题翻译：磁光器件及其制造方法
公开(公告)号：US20080218841A1
公开(公告)日：2008-09-11
申请号：US11886213
申请日：2006-02-24
申请人： Katsuhiro Iwasaki , Hiromitsu Umezawa
发明人： Katsuhiro Iwasaki , Hiromitsu Umezawa
IPC分类号： G02F1/09 , B05D5/06
CPC分类号： G02F1/09 , G02F2203/12
摘要： Magneto-optical crystals of each pixel of a magneto-optical device are magnetically and completely separated, and the entire surface thereof is flattened.Disclosed is a magneto-optical device including a non-magnetic substrate, a magneto-optical crystal embedded in recessed portions formed in the surface of the non-magnetic substrate at positions where pixels are to be located, and a partitioning wall monolithic with the non-magnetic substrate and magnetically separating the magneto-optical crystal from each other at the position of a gap between the pixels, wherein the entire surface of the magneto-optical device is flattened. A method for manufacturing a magneto-optical device includes a digging down step, executed at positions where pixels are to be located, of digging down into the surface of a non-magnetic substrate in advance at the positions where the pixels are to be formed, so that a gap portion located between the pixels and around the dug areas remains to form a partitioning wall, a magnetic film forming step of forming a film made of a magneto-optical crystal over substantially the entire surface of the non-magnetic substrate, and a surface flattening step of performing flattening by removing a protruded portion formed by the magnetic film that has grown on the gap portion.
摘要翻译：磁光器件的每个像素的磁光晶体被磁性地完全分离，并且其整个表面变平。公开了一种磁光装置，其包括非磁性基板，嵌入在非磁性基板的表面中形成的凹部中的磁光晶体，位于像素的位置，以及与非磁性基板成一体的分隔壁，磁性基板，并且在像素之间的间隙的位置处将磁光晶体彼此磁分离，其中磁光器件的整个表面变平。一种制造磁光装置的方法包括：在要形成像素的位置处执行的挖掘步骤，预先在要形成像素的位置向下挖入非磁性基板的表面; 使得位于像素之间和挖掘区周围的间隙部分保留以形成分隔壁;磁性膜形成步骤，在非磁性基板的基本上整个表面上形成由磁光晶体制成的膜;以及通过去除由在间隙部分上生长的磁性膜形成的突出部分来进行平坦化的表面平坦化步骤。

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