公开(公告)号：US5256242A

公开(公告)日：1993-10-26

申请号：US516907

申请日：1990-04-30

申请人： Minoru Imaeda ,  Emi Asai ,  Katsunori Okamoto

发明人： Minoru Imaeda ,  Emi Asai ,  Katsunori Okamoto

IPC分类号： C01G49/00 ,  C04B35/26 ,  C04B35/645 ,  H01F1/34

CPC分类号： H01F1/346 ,  C01G49/0018 ,  C01G49/0036 ,  C01G49/0054 ,  C04B35/26 ,  C04B35/6455 ,  C01P2002/30 ,  C01P2002/50 ,  C01P2004/52 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2006/42 ,  C01P2006/60

摘要： A method of manufacturing ferrite crystals such as single crystal bodies and polycrystal bodies with garnet structure is disclosed, which includes the steps of effecting a composition controlling for raw powders, forming raw powders, sintering formed bodies and effecting hot isostatic press treatment for sintered bodies. Also, a method of producing ferrite powders preferably used for the ferrite crystal manufacturing method mentioned above.The thus obtained ferrite crystal bodies with garnet structure show good magnetooptical properties such as light transmissivity, Faraday rotation angle and Verdet constant, and are preferably used for magnetooptical elements such as optical isolators and optical magnetic field sensors etc.

公开(公告)号：US5584928A

公开(公告)日：1996-12-17

申请号：US451739

申请日：1995-05-26

申请人： Emi Asai ,  Minoru Imaeda

发明人： Emi Asai ,  Minoru Imaeda

IPC分类号： G02F1/09 ,  C04B35/26 ,  C30B1/00 ,  C30B1/10 ,  C30B29/28 ,  G02B27/28 ,  G02F1/00 ,  H01F1/34

CPC分类号： H01F1/346 ,  C04B35/2675 ,  C30B1/00 ,  C30B29/28 ,  G02F1/0036

摘要： A material for use in a 1.5 .mu.m wide-band optical isolator, includes a bismuth-substituted terbium-iron garnet single crystal having a composition of Bi.sub.x Tb.sub.3-x Fe.sub.5 O.sub.12 in which x is 0.35 to 0.45. This bismuth-substituted terbium-iron garnet single crystal is grown by a solid phase reaction. A process for producing such a material is also disclosed.

摘要翻译： 用于1.5μm宽带光隔离器的材料包括具有BixTb3-xFe5O12组成的铋取代的铽 - 铁石榴石单晶，其中x为0.35至0.45。 该铋取代的铽 - 铁石榴石单晶通过固相反应生长。 还公开了一种生产这种材料的方法。

公开(公告)号：US5140156A

公开(公告)日：1992-08-18

申请号：US572227

申请日：1990-08-24

申请人： Minoru Imaeda ,  Emi Asai ,  Katsunori Okamoto

发明人： Minoru Imaeda ,  Emi Asai ,  Katsunori Okamoto

IPC分类号： G01R33/032

CPC分类号： G01R33/0322

摘要： A high sensitivity optomagnetical sensor comprising a light source, a magnetic field-detecting section, a light-receiving section for receiving light emitted from the light source through the magnetic field-detecting section, a measurement-controlling section for controlling the light source, the magnetic field-detecting section, and the light-receiving section, and for measuring an intensity of light received by the light-receiving section, and light transmission paths using optical fibers for optically connecting the light-source section and the magnetic field-detecting section and optically connecting the magnetic field-detecting section and the light-receiving section. The magnetic field-detecting section is constituted by a polarizer, an analyzer and a magnetooptical element arranged between the polarizer and the analyzer. A garnet type ferrite polycrystal is used as a magnetooptical element of the sensor. The ferrite polycrystal has a Verdet constant of not less than 1 deg/cm.Oe, a thickness of not less than 100 .mu.m, a light transmittance of not less than 10%, a temperature dependency on detecting the magnetic field in a temperature range of -20.degree. to +60.degree. C. being within .+-.1.0%, a magnetic field-detecting precision of not more than 1/10,000, and a composition of Bi.sub.x Gd.sub.y Y.sub.z Fe.sub.5 O.sub.12 (X+Y+Z=3).