JPH03280011A - Magneto-optical material - Google Patents
Magneto-optical materialInfo
- Publication number
- JPH03280011A JPH03280011A JP8195390A JP8195390A JPH03280011A JP H03280011 A JPH03280011 A JP H03280011A JP 8195390 A JP8195390 A JP 8195390A JP 8195390 A JP8195390 A JP 8195390A JP H03280011 A JPH03280011 A JP H03280011A
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- temp
- crystal film
- faraday rotation
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 12
- 239000002223 garnet Substances 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 15
- 239000013078 crystal Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 abstract description 8
- 229910052771 Terbium Inorganic materials 0.000 abstract description 5
- 229910052691 Erbium Inorganic materials 0.000 abstract description 4
- 230000000295 complement effect Effects 0.000 abstract description 4
- 239000000155 melt Substances 0.000 abstract description 3
- 230000004907 flux Effects 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 abstract 2
- 229910011255 B2O3 Inorganic materials 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910052761 rare earth metal Inorganic materials 0.000 description 7
- 150000002910 rare earth metals Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 101000574352 Mus musculus Protein phosphatase 1 regulatory subunit 17 Proteins 0.000 description 1
- 240000005499 Sasa Species 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
この発明は光アイソレータや光サーキュレータなどに用
いられる磁気光学材料に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to magneto-optical materials used in optical isolators, optical circulators, etc.
［従来の技術］
従来より、半導体レーザから放出された光線と戻り光と
を分離するための光アイソレータとして、あるいは光フ
アイバ損失測定において光ファイバの後方散乱光を受光
ダイオードのみに導くための光サーキュレータとしてフ
ァラデー回転効果を有する磁気光学材料が利用されてい
る。[Prior Art] Conventionally, optical circulators have been used as optical isolators for separating the light beam emitted from a semiconductor laser and returning light, or for guiding backscattered light from an optical fiber only to a light receiving diode in optical fiber loss measurement. Magneto-optical materials having a Faraday rotation effect are used as such.
ファラデー回転効果は磁気光学材料が磁界の中に置かれ
た場合、材料中を磁界方向に進む光の偏光面が回転する
現象であり、光アイソレータ等に適用される磁気光学素
子としては、ファラデー回転係数（単位長当りの回転角
）か大きいこと、且つファラデー回転係数の温度依存性
が少ないこと、更に挿入損失か少ないことか条件となる
。The Faraday rotation effect is a phenomenon in which when a magneto-optical material is placed in a magnetic field, the plane of polarization of light traveling in the direction of the magnetic field rotates. The conditions are that the coefficient (rotation angle per unit length) is large, the Faraday rotation coefficient has little temperature dependence, and the insertion loss is small.
この種の磁気光学材料として、Ｂｉ置換を行った希土類
鉄ガーネット（一般式Ｂ ｉ 、ＲＥ、Ｆ ｅ５０．２
で表わされるもので、ＲＥは希土類を表わしｘ＋ｙ＝３
である）か開発されている。このような希土類鉄ガーネ
ット結晶は基板となるガーネット上に液相エピタキシャ
ル法によって育成することができ、Ｂｉの置換量が多い
はいとファラデー回転係数が向上する。Ｂｉを多量に置
換するためにＦｅをＡＩおよび／又はＧａで置換するこ
とか行なわれている（特開昭６１−２０９２５号）。Rare earth iron garnet with Bi substitution (general formula B i , RE, Fe50.2
where RE represents rare earth and x+y=3
) or has been developed. Such a rare earth iron garnet crystal can be grown on a garnet substrate by a liquid phase epitaxial method, and the Faraday rotation coefficient increases as the amount of Bi substitution increases. In order to replace a large amount of Bi, it has been attempted to replace Fe with AI and/or Ga (Japanese Patent Application Laid-open No. 20925/1983).
一方、Ｂｉはイオン半径が犬であるため、Ｂｉ量が多く
なると基板との格子定数の差が大きくなり格子整合性が
悪い。このため、希土類元素としてイオン半径の小さな
希土類元素を用いることにより、基板との格子整合性を
図っている（特開昭６３−２９１０２８号、特開平１−
２１７３１３号）。On the other hand, since Bi has a dog-shaped ionic radius, as the amount of Bi increases, the difference in lattice constant with the substrate increases, resulting in poor lattice matching. For this reason, lattice matching with the substrate is achieved by using rare earth elements with a small ionic radius (JP-A-63-291028, JP-A-1-1999).
No. 217313).
［発明が解決しようとする課題］
しかし、ＦｅをＡＩ、Ｇａ等の非磁性元素で置換した磁
気光学材料では、一般に温度依存性が低下する傾向があ
る。また、希土類鉄ガーネットを形成する希土類は、１
種又は２種以上を混合して用いられているが、それぞれ
温度特性が異なり、一種のみを用いた場合或いは組合せ
が適当でない場合にはファラデー回転係数の温度依存性
が大きく、磁気光学素子として実用できない。[Problems to be Solved by the Invention] However, in magneto-optical materials in which Fe is replaced with a non-magnetic element such as AI or Ga, temperature dependence generally tends to decrease. In addition, the rare earths that form rare earth iron garnet are 1
Although they are used as a mixture of two or more types, each has different temperature characteristics, and when only one type is used or the combination is inappropriate, the Faraday rotation coefficient has a large temperature dependence, making it difficult to put it into practical use as a magneto-optical element. Can not.
本発明は特定の希土類を２種組み合わせることによりフ
ァラデー回転係数と共に、温度依存性を向上することの
できる磁気光学材料を提供することを目的とし、更に光
アイソレータ等として用いた場合、挿入損失が少ない磁
気光学材料を提供することを目的とする。The purpose of the present invention is to provide a magneto-optical material that can improve the Faraday rotation coefficient and temperature dependence by combining two types of specific rare earth elements, and furthermore has low insertion loss when used as an optical isolator etc. The purpose is to provide magneto-optical materials.
［課題を解決するための手段］
このような目的を達成するために本発明者等は温度特性
が相補的である２種の希土類の組合せについて鋭意研究
の結果、希土類としてＥｒとＴｂを組合せた場合にファ
ラデー回転係数が極めて高く、しかも温度依存性が小さ
いことを見出し本発明に至ったものである。[Means for Solving the Problems] In order to achieve such an objective, the inventors of the present invention have conducted extensive research into combinations of two types of rare earths with complementary temperature characteristics, and have combined Er and Tb as rare earths. In this case, the Faraday rotation coefficient is extremely high and the temperature dependence is small, leading to the present invention.
即ち本発明の磁気光学材料は、非磁性ガーネット基板上
に育成され、組成式
％式％
）
で表わされる磁性ガーネット結晶膜から成るものである
。That is, the magneto-optical material of the present invention is grown on a non-magnetic garnet substrate and consists of a magnetic garnet crystal film represented by the compositional formula %.
ここで、非磁性ガーネット基板は、Ｇｄ５Ｇａｓ０１ｆ
ｆｉ、Ｓｍ５ＧａｓＯｚｚ、ＮｄＢＧＢｓＯ１＊（以下
ＮＧＧという） 、Ｃａ −Ｍｇ−Ｚ ｒ置換Ｇ ｄ
、Ｇ ａ。Here, the non-magnetic garnet substrate is Gd5Gas01f
fi, Sm5GasOzz, NdBGBsO1* (hereinafter referred to as NGG), Ca-Mg-Z r substitution G d
, G a.
０．２（以下５ＧＧＧという）等が用いられるが、上記
組成の結晶膜は格子定数が１２．４９７Ａ前後の５ＧＧ
Ｇ基板との格子整合性が最もよい。0.2 (hereinafter referred to as 5GGG), etc., but the crystal film with the above composition is 5GG with a lattice constant of around 12.497A.
It has the best lattice matching with the G substrate.
磁性ガーネット結晶膜の育成は液相エピタキシャル法に
よって行う。即ち、ＰｂＯ１Ｂ２０３、Ｂｉａｓｓのフ
ラックス中に、Ｆｅ２Ｏ，、Ｅｒ、Ｏ，。The magnetic garnet crystal film is grown by liquid phase epitaxial method. That is, PbO1B203, Fe2O,, Er, O, in the Biass flux.
Ｔｂ、Ｏ，を融かして成る所定組成の融液中にガーネッ
ト基板を浸漬することによって基板上に厚さ５００μｍ
以上の結晶膜を育成することができる。A garnet substrate is immersed in a melt of a predetermined composition made by melting Tb, O, and a thickness of 500 μm is formed on the substrate.
The above crystalline film can be grown.
得られた結晶膜は必要に応じ基板を全部又は１部削り取
った後、光アイソレータ等の磁気光学素子として用いる
。The obtained crystal film is used as a magneto-optical element such as an optical isolator after removing all or part of the substrate as necessary.
［実施例］ 以下、本発明の詳細な説明する。[Example] The present invention will be explained in detail below.
実施例１
表１に示す組成の融液中（７００℃）に５ＧＧＧ基板を
１０分浸漬し、基板上に鏡面を呈する厚さ５μｍの結晶
膜を得た。Example 1 A 5GGG substrate was immersed in a melt having the composition shown in Table 1 (700° C.) for 10 minutes to obtain a 5 μm thick crystal film exhibiting a mirror surface on the substrate.
得られた結晶膜の組成及び波長１．３μｍにおけるファ
ラデー回転係数を表２に示す。Table 2 shows the composition of the obtained crystal film and the Faraday rotation coefficient at a wavelength of 1.3 μm.
実施例２
実施笹１と同様の融液中に、ＮＧＧ基板を１０分浸漬し
、基板上に鏡面を呈する厚さ５μｍの結晶膜を得た。Example 2 An NGG substrate was immersed in the same melt as in Example Sasa 1 for 10 minutes to obtain a 5 μm thick crystal film exhibiting a mirror surface on the substrate.
表
表
［発明の効果コ
以上の実施例からも明らかなように、本発明によれば、
磁性ガーネット結晶膜の希土類として温変時性が相補的
であるＥｒとＴｂを用いることにより、ファラデー回転
係数が極めて大きく、その温度依存性の小さい磁気光学
材料を得ることができる。Table [Effects of the Invention] As is clear from the above embodiments, according to the present invention,
By using Er and Tb, which have complementary thermal chronotropy, as rare earth elements in the magnetic garnet crystal film, it is possible to obtain a magneto-optical material with an extremely large Faraday rotation coefficient and a small temperature dependence.
従って、光アイソレータ等の磁気光学素子として用いた
場合素子の小型化、低コスト化かで実現でき、挿入損失
も極めて小さくすることができる。Therefore, when used as a magneto-optical element such as an optical isolator, the element can be made smaller and at a lower cost, and the insertion loss can also be extremely reduced.
Claims (1)
−＿ｘ＿−＿ｙＴｂ＿ｘＢｉ＿ｙＦｅ＿５Ｏ＿１＿２（
但し、０＜ｘ＜３、０＜ｙ＜３である） で表わされる磁性ガーネット結晶膜から成ることを特徴
とする磁気光学材料。[Claims] Grown on a non-magnetic garnet substrate, having the composition formula Er_3_
−_x_-_yTb_xBi_yFe_5O_1_2(
However, 0<x<3, 0<y<3) A magneto-optical material comprising a magnetic garnet crystal film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8195390A JPH03280011A (en) | 1990-03-29 | 1990-03-29 | Magneto-optical material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8195390A JPH03280011A (en) | 1990-03-29 | 1990-03-29 | Magneto-optical material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03280011A true JPH03280011A (en) | 1991-12-11 |
Family
ID=13760867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8195390A Pending JPH03280011A (en) | 1990-03-29 | 1990-03-29 | Magneto-optical material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03280011A (en) |
-
1990
- 1990-03-29 JP JP8195390A patent/JPH03280011A/en active Pending
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