CN100346195C - 无需外加偏磁场的45°法拉第旋转器 - Google Patents
无需外加偏磁场的45°法拉第旋转器 Download PDFInfo
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- CN100346195C CN100346195C CNB2005100502935A CN200510050293A CN100346195C CN 100346195 C CN100346195 C CN 100346195C CN B2005100502935 A CNB2005100502935 A CN B2005100502935A CN 200510050293 A CN200510050293 A CN 200510050293A CN 100346195 C CN100346195 C CN 100346195C
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- 239000013078 crystal Substances 0.000 claims abstract description 24
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 9
- 230000005415 magnetization Effects 0.000 claims abstract description 8
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 8
- 238000005520 cutting process Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 abstract description 14
- 230000003287 optical effect Effects 0.000 abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 239000002223 garnet Substances 0.000 description 2
- VMXUWOKSQNHOCA-UKTHLTGXSA-N ranitidine Chemical compound [O-][N+](=O)\C=C(/NC)NCCSCC1=CC=C(CN(C)C)O1 VMXUWOKSQNHOCA-UKTHLTGXSA-N 0.000 description 2
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000005408 paramagnetism Effects 0.000 description 1
- -1 rare-earth ion Chemical class 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
本发明公开了一种无需外加偏磁场的45°法拉第旋转器。它的成份是(Re3-x-yYxBiy)(Fe5-zGaz)O12晶体,其中,0<x<2,0<y<1,Re:表示稀土大离子,所述的稀土大离子为Eu3+、Yb3+、Sm3+。沿(Re3-x-yYxBiy)(Fe5-zGaz)O12晶体<111>晶轴方向切割、充磁后,使其处于饱和磁化状态。本发明鉴于稀土大离子Eu3+与Y3+离子有相反的磁致伸缩系数和大的单离子磁晶各向异性,Bi3+离子能提高θf角,Ga3+离子进入四面体晶位在一定范围内又能降低Ms值从而提高剩磁比和配合大稀土离子的替代,因此生长(Re3-x-yYxBiy)(Fe5-zGaz)O12晶体,沿其<111>晶轴方向切割、充磁后形成无需外加偏磁场使其处于饱和磁化状态的45°法拉第旋转器,这将使光隔离器不需要外加偏磁场而结构微型化和解决了在集成光学系统中对光隔离器外加偏磁场的困难。
Description
技术领域
本发明涉及光通信、光集成,尤其涉及一种无需外加偏磁场的45°法拉第旋转器。
背景技术
光隔离器是光通信、集成光学等系统中不可缺少的关键器件之一。以偏振敏感型光隔离器为例,作为光隔离器核心部件的45°法拉第旋转器目前国内外都采用含Bi铁石榴石晶体,其中GdBiIG材料得到普遍应用。这种晶体薄膜是在顺磁性石榴石晶体GGG表面上用液相外延工艺的方法生长而成,其长度总和约小于1mm,还需一定尺寸的永久磁铁使其处于饱和磁化状态,永久磁铁的采用对光隔离器小型化和集成光学系统中使用是有局限的。
发明内容
本发明的目的是提供一种无需外加偏磁场的45°法拉第旋转器。
它的成份是(Re3-x-yYxBiy)(Fe5-zGaz)O12晶体,其中,0<x<2,0<y<1,Re:表示稀土大离子Eu3+、Yb3+、Sm3+,沿(Re3-x-yYxBiy)(Fe5-zGaz)O12晶体<111>晶轴方向切割、充磁后,使其处于饱和磁化状态。
本发明鉴于稀土大离子与Y3+离子有相反的磁致伸缩系数和大的单离子磁晶各向异性,Bi3+离子能提高θf角,Ga3+离子进入四面体晶位在一定范围内又能降低Ms值从而提高剩磁比和配合大稀土离子的替代。因此,生长(Re3-x-yYxBiy)(Fe5-zGax)O12晶体)并沿其<111>晶轴方向切割、充磁后使其处于饱和磁化状态而形成无需外加偏磁场的45°法拉第旋转器,这将使光隔离器不需要外加偏磁场而结构微型化和解决了在集成光学系统中对光隔离器外加偏磁场的困难。
附图说明
附图是光隔离器结构示意图,图中:起偏器1、45°法拉第旋转器2、检偏器3。
具体实施方式
如附图所示,光隔离器具有起偏器1、45°法拉第旋转器2、检偏器3,45°法拉第旋转器2设置在起偏器1和检偏器3之间即可不需要外加偏磁场。
无需外加偏磁场的45°法拉第旋转器成份是(Re3-x-yYxBiy)(Fe5-zGaz)O12晶体(0<x<2,0<y<1,Re:表示稀土大离子,为Eu3+、Yb3+、Sm3+)。沿(Re3-x-yYxBiy)(Fe5-zGaz)O12晶体<111>晶轴方向切割、充磁后,使其处于饱和磁化状态。
本发明以B2O3/Bi2O3为助熔剂,采用高温溶液自发成核缓慢降温方法生长(Re3-x-yYxBiy)(Fe5-zGaz)O12晶体。为提高晶体生长质量,拟采用顶部籽晶、加速坩埚旋转技术。通过改变Re、Y、Bi、Ga的成分比例,获取有高矩形度θf迟滞回线的(Re3-x-yYxBiy)(Fe5-zGaz)O12晶体,并沿其<111>晶轴方向切割、充磁后形成无需外加偏磁场的45°法拉第旋转器。
无需外加偏磁场的45°旋转器的主要性能指标为;
中心波长(nm) 1550
法拉第旋转角θf(deg/cm) >450 即45°旋转器的厚度<1.0mm
晶体的矫顽力Hc(Oe) >1000
晶体饱和磁化强度4πMs(Gs) <600
晶体剩磁比(矩形度)Mr/Ms >0.87。
Claims (1)
1.一种无需外加偏磁场的45°法拉第旋转器,其特征在于它的成份是(Re3-x-yYxBiy)(Fe5-zGaz)O12晶体,其中,0<x<2,0<y<1,Re:表示稀土大离子Eu3+、Yb3+、Sm3+,沿(Re3-x-yYxBiy)(Fe5-zGaz)O12晶体<111>晶轴方向切割、充磁后,使其处于饱和磁化状态。
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4735489A (en) * | 1985-05-17 | 1988-04-05 | U.S. Philips Corporation | Device for rotating the plane of polarization of linearly polarized light and method of fabrication |
CN1397026A (zh) * | 2000-11-30 | 2003-02-12 | Tdk株式会社 | 法拉第旋转器和光衰减器 |
US20030177975A1 (en) * | 2000-09-18 | 2003-09-25 | Akio Ikesue | Rare earth-iron garnet single crystal material and method for preparation thereof and device using rare earth-iron garnet single crystal material |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4735489A (en) * | 1985-05-17 | 1988-04-05 | U.S. Philips Corporation | Device for rotating the plane of polarization of linearly polarized light and method of fabrication |
US20030177975A1 (en) * | 2000-09-18 | 2003-09-25 | Akio Ikesue | Rare earth-iron garnet single crystal material and method for preparation thereof and device using rare earth-iron garnet single crystal material |
CN1397026A (zh) * | 2000-11-30 | 2003-02-12 | Tdk株式会社 | 法拉第旋转器和光衰减器 |
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