JPS638601A - Optical fiber with anti-reflection coating - Google Patents
Optical fiber with anti-reflection coatingInfo
- Publication number
- JPS638601A JPS638601A JP61152468A JP15246886A JPS638601A JP S638601 A JPS638601 A JP S638601A JP 61152468 A JP61152468 A JP 61152468A JP 15246886 A JP15246886 A JP 15246886A JP S638601 A JPS638601 A JP S638601A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- end surface
- optical fiber
- as2se3
- potassium chloride
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 22
- 238000000576 coating method Methods 0.000 title claims abstract description 9
- 239000011248 coating agent Substances 0.000 title claims abstract description 8
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 27
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 13
- 239000001103 potassium chloride Substances 0.000 claims abstract description 13
- WBFMCDAQUDITAS-UHFFFAOYSA-N arsenic triselenide Chemical compound [Se]=[As][Se][As]=[Se] WBFMCDAQUDITAS-UHFFFAOYSA-N 0.000 claims abstract description 12
- PGAPATLGJSQQBU-UHFFFAOYSA-M thallium(i) bromide Chemical compound [Tl]Br PGAPATLGJSQQBU-UHFFFAOYSA-M 0.000 claims abstract description 8
- 239000006104 solid solution Substances 0.000 claims abstract description 4
- CMJCEVKJYRZMIA-UHFFFAOYSA-M thallium(i) iodide Chemical compound [Tl]I CMJCEVKJYRZMIA-UHFFFAOYSA-M 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 abstract description 11
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 8
- 230000031700 light absorption Effects 0.000 description 5
- 229910017000 As2Se3 Inorganic materials 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical class [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052798 chalcogen Inorganic materials 0.000 description 1
- 150000001787 chalcogens Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Landscapes
- Surface Treatment Of Optical Elements (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、赤外のエネルギ光伝送に用いられる臭化タリ
ウムと沃化タリウムの固溶体より成る光ファイバと、そ
の反射防止膜に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical fiber made of a solid solution of thallium bromide and thallium iodide used for transmitting infrared energy light, and an antireflection coating thereof.
従来の技術
臭化タリウムと沃化タリウムの固溶体（以下、ＫＲ’３
−ｓ とする）より成る光ファイバは、赤外光を低損
失で伝送する。特に、光吸収が小さいので炭酸ガスレー
ザ光（波長１０．６ ｕｉｎ ）など赤外のエネルギ伝
送が可能である。しかしＫＨ２−６は、屈折率が２．３
７と大きいためファイバ人出射両端の合計反射損失が約
２８チになる。これは、内部損失と比較して５−１０倍
大きい値であり、ファイバ全体の伝送効率向上のために
は、反射防止膜が必要である。Conventional technology A solid solution of thallium bromide and thallium iodide (hereinafter referred to as KR'3)
-s) transmits infrared light with low loss. In particular, since light absorption is small, infrared energy transmission such as carbon dioxide laser light (wavelength 10.6 uin) is possible. However, KH2-6 has a refractive index of 2.3.
7, so the total reflection loss at both ends of the fiber output is about 28 inches. This value is 5 to 10 times larger than the internal loss, and an antireflection coating is necessary to improve the transmission efficiency of the entire fiber.
ファイバ用の反射防止膜は、レンズの焦点付近で使用さ
れるため、既に実用化きれている一般のレーザ光学部品
に比べ、レーザエネルギ密度が１−２桁高い。例えば出
力ｓｏＷ級のレーザメスの場合、レーザ入射ビーム径を
直径０．１７ ｍｍ （エネルギ強度が１／ｅ になる
径）とすると、そのエネルギ密度は約１６０ＫＷ／ｉに
なる。また基材であるＫＲＳ−５は、熱伝導率が小さい
ので、発生熱が逃げ難い。従って、ＫＲＳ −５ファイ
バ用の反射防止膜は、光吸収の小さな膜で、如何に端面
の発熱を押えるかにかかっていた。Since antireflection coatings for fibers are used near the focal point of the lens, the laser energy density is one to two orders of magnitude higher than that of general laser optical components that have already been put into practical use. For example, in the case of a laser scalpel with an output soW class, if the diameter of the laser incident beam is 0.17 mm (the diameter where the energy intensity is 1/e), the energy density will be about 160 KW/i. Furthermore, since the base material KRS-5 has a low thermal conductivity, it is difficult for the generated heat to escape. Therefore, the antireflection coating for the KRS-5 fiber is a coating with low light absorption, and it depends on how well the heat generation at the end face can be suppressed.
この目的のために本発明者らは、三セレン化工ひ素・塩
化カリウム・三セレン化工ひ素の三層構造（以下、Ａｓ
２ Ｓｅ３／ＫＣｅ／Ａ３２Ｓｅ３とする）による反射
防止膜を得ている。For this purpose, the present inventors developed a three-layer structure of triselenium-modified arsenic, potassium chloride, and tri-selenium-modified arsenic (hereinafter referred to as As
2Se3/KCe/A32Se3) was obtained.
第４図に、三層反射防止膜の構造図を示す。FIG. 4 shows a structural diagram of the three-layer antireflection film.
ＫＲＳ −ｔｓ ファイバ１の端面上に、光学的膜厚
が２、５１８−２．７８３ ｐｍのＡ ｅ２Ｓ ｅ３２
、光学的膜厚が１．１５１−１．２７２μｍのＫＣｅ３
、光学的膜厚が０．６７７−０．７４９μｍのＡｓ２Ｓ
ｅ３４で構成された反射防止膜が形成されている。膜の
形成は、真空蒸着法を用いて行われる。A e2S e32 with an optical thickness of 2,518-2.783 pm is placed on the end face of KRS-ts fiber 1.
, KCe3 with an optical thickness of 1.151-1.272 μm
, As2S with an optical thickness of 0.677-0.749 μm
An antireflection film made of e34 is formed. The film is formed using a vacuum evaporation method.
発明が解決しようとする問題点
一般に、塩化カリウムは光吸収が小さく、炭酸ガスレー
ザには好適な材料であるが、吸湿性を有しているため湿
度雰囲気では、吸湿による光吸収の増加が生ずる。また
、Ａ Ｓ ２ Ｓ ｓ３はカルコゲン系の材料で吸湿性
が無く、従って第４図に示した・Ａ Ｓ２ Ｓ ｅｓ
４ば、ＫＣＩ３を保護するのに役だっている。Problems to be Solved by the Invention In general, potassium chloride has low light absorption and is a suitable material for carbon dioxide lasers, but since it has hygroscopic properties, in a humid atmosphere, light absorption increases due to moisture absorption. In addition, A S2 S s3 is a chalcogen-based material and has no hygroscopicity, so the A S2 S s s3 shown in Figure 4 is
Fourth, it helps protect KCI3.
しかし、光ファイバ１は通常の場合、端面研磨仕上げの
状態で使用されるため、端面のエツジ部分では、Ａｇ３
５ｅ３４は完全に覆われず、Ａで示す様なＭＣＩの僅か
な露出部が出来る。このＡ部より吸湿が生じるため大気
中では、ＫＣｅ層に膜質の変化が起り、光吸収率が増加
する。However, since the optical fiber 1 is usually used with the end face polished, the edge part of the end face is Ag3
5e34 is not completely covered, leaving a slight exposed portion of MCI as shown in A. Moisture absorption occurs from this part A, so that in the atmosphere, the film quality of the KCe layer changes, and the light absorption rate increases.
実際的に、光ケーブルの両端に光学ウィンドウを設けて
、乾燥空気や窒素ガス等を満たし光ファイバ端面付近を
乾燥状態にすることが可能であるが、構造的に複雑にな
り、密閉性の問題も生ずる。In practice, it is possible to provide an optical window at both ends of an optical cable and fill it with dry air or nitrogen gas to keep the area near the end face of the optical fiber dry, but this becomes structurally complex and poses problems with sealing. arise.
本発明は、最外層のＡｓ２Ｓｅ３の保護機能を改善し大
気中においてもＫＣｅ層の吸湿を防せぎ、レーザエネル
ギに対する初期特性を維持させる事を目的とする。The present invention aims to improve the protective function of the outermost As2Se3 layer, prevent the KCe layer from absorbing moisture even in the atmosphere, and maintain the initial characteristics against laser energy.
問題点を解決するための手段
本発明は、上記問題点を解決するために、エツジに丸み
のある光ファイバ端面上に、第１層（Ａ部 ２Ｓｅ３）
・第２層（ＫＣｅ）は、端面に垂直な方向から第３層（
最外層のＡｓ２Ｓｅ３）は、端面に対し斜め方向から膜
形成を行い反射防止膜を得るものである。Means for Solving the Problems In order to solve the above problems, the present invention provides a first layer (part A 2Se3) on the end face of an optical fiber with rounded edges.
・The second layer (KCe) is connected to the third layer (KCe) from the direction perpendicular to the end surface.
The outermost layer (As2Se3) is formed obliquely to the end face to obtain an antireflection film.
作 用
本発明は上記した構成により、最外層のＡｓ ２ Ｓ
ｅ ３が光フデイバ端面のエツジの部分から中間層のＫ
Ｃｅ膜の端まで端面中央と同様に覆われる。Effect The present invention has the above-described structure, and the outermost layer As 2 S
e 3 is K of the intermediate layer from the edge part of the optical fiber end face.
The ends of the Ce film are covered in the same manner as the center of the end face.
実施例
第２図は、本発明の一実施例による反射防止膜を形成す
る前の光ファイバ端面の側面図を示す。Embodiment FIG. 2 shows a side view of an end face of an optical fiber before forming an antireflection film according to an embodiment of the present invention.
光ファイバ１０の端面仕上げをエツジに丸みのある形状
１１とする。光ファイバにレーザを入射させた時光学的
特性が損なわれない様にするためには、端面のフラット
な部分の大きさＢは、レーザ入射スポット径程度でなけ
ればならない。仮に、ファイバの直径を０．５ｍｍとす
ると、光軸合せ精度を考慮して、入射レーザスポット径
は、直径約０．３５ｍｍとなる。従って、Ｂの大きさは
、 ０．３６ｍｍ程度が適当である。The end face of the optical fiber 10 is finished into a shape 11 with rounded edges. In order to prevent optical characteristics from being impaired when a laser is incident on an optical fiber, the size B of the flat portion of the end face must be approximately the diameter of the laser incident spot. If the diameter of the fiber is 0.5 mm, the incident laser spot diameter will be approximately 0.35 mm in consideration of optical axis alignment accuracy. Therefore, the appropriate size of B is about 0.36 mm.
また、ＫＲＳ−ｓファイバはエツチング等により容易に
エツジに丸みのある端面形状にする事ができる。Further, the KRS-s fiber can be easily formed into an end face shape with rounded edges by etching or the like.
次に、反射防止膜の形成法を述べる。第３図は、その形
成過程を示す。まず、（ａ）のように光ファイバ２ｏの
上に、方向ＣよりＡ３２Ｓ６１３２１とＫＣ５２２を順
に形成する。その後、端面のエツジ２５に掛る様に方向
り、Ｅ、ＦからＡｓ２Ｓｅ３２６を形成する。Next, a method for forming an antireflection film will be described. FIG. 3 shows the formation process. First, A32S61321 and KC522 are formed in order from direction C on the optical fiber 2o as shown in (a). Thereafter, As2Se 326 is formed from E and F so as to span the edge 25 of the end face.
第１図は、反射防止膜形成後の、端面の断面図である。FIG. 1 is a sectional view of the end surface after the antireflection film is formed.
光ファイバ端面３ｏ上にＡｓ２Ｓｅ３３１、ＫＣｅ３２
、Ａｓ２Ｓｅ３３３が順に形成されている。As2Se331 and KCe32 on the optical fiber end face 3o
, As2Se333 are formed in this order.
発明の効果
以上の説明から明らかなように、本発明によれば、中間
層のＫＣＩは外側まで端面中央の部分と同程度のＡ ８
２ Ｓ ｅｓで覆われ、Ａｓ２Ｓｅ３は湿度に対しＫＣ
ｅを十分に保護することになる。Effects of the Invention As is clear from the above explanation, according to the present invention, the KCI of the intermediate layer is A8 which is the same level as the central part of the end face up to the outside.
2S es, As2Se3 has KC against humidity.
This will provide sufficient protection for e.
従って、本発明は、光吸収の小さいＡｇ３ Ｓ ｅｓ／
Ｋ Ｃｅ／Ａｓ２Ｓｅ３構造の特徴を、例えば、湿度５
０％程 第度の大気中においても経時的に、安定し
て引出す有用性の高いものである。Therefore, the present invention uses Ag3S es/
The characteristics of the K Ce/As2Se3 structure are, for example, humidity 5
It is highly useful as it can be drawn out stably over time even in an atmosphere of about 0%.
第１図は本発明の一実施例における反射防止膜付光ファ
イバ端面の軸方向断面図、第２図は本発明の光ファイバ
端面の側面図、第３図は本発明の反射防止膜形成方法を
示す断面図、第４図は従来の反射防止膜付端面の軸方向
断面図である。
１ 、１０ 、２０ 、３０・−・・−・ＫＲＳ−５
光ファイバ、２．２１．３１−・・・三セレン化二ひ素
（Ａｓ２Ｓｅ２）、３３・・・・・・三セレン化二ひ素
（Ａｓ２５ｅｓ ）。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名１図
２図FIG. 1 is an axial cross-sectional view of the end face of an optical fiber with an antireflection film according to an embodiment of the present invention, FIG. 2 is a side view of the end face of the optical fiber of the present invention, and FIG. 3 is a method for forming an antireflection film of the present invention. FIG. 4 is an axial cross-sectional view of an end face with a conventional antireflection film. 1 , 10 , 20 , 30...KRS-5
Optical fiber, 2.21.31-... diarsenic triselenide (As2Se2), 33... diarsenic triselenide (As25es). Name of agent: Patent attorney Toshio Nakao and 1 other person Figure 1 Figure 2
Claims (3)
ファイバの端面上に、膜構成が三セレン化二ひ素・塩化
カリウム・三セレン化二ひ素の三層構造の反射防止膜を
形成し、かつ、光ファイバ端面のエッジが外周長０．０
５−０．１５ｍｍの曲率を有することを等徴とする反射
防止膜付光ファイバ。(1) An antireflection film having a three-layer structure of diarsenic triselenide, potassium chloride, and diarsenic triselenide is formed on the end face of an optical fiber made of a solid solution of thallium bromide and thallium iodide, And the edge of the optical fiber end face has an outer circumference of 0.0
5-An optical fiber with an anti-reflection coating having a curvature of 0.15 mm.
素が覆われていることを特徴とする特許請求の範囲第１
項記載の反射防止膜付光ファイバ。(2) Claim 1 characterized in that the outermost layer of diarsenic triselenide is covered to the edge of the potassium chloride layer.
Optical fiber with anti-reflection coating as described in section.
ウムを端面と垂直方向から、第３層の三セレン化ひ素を
端面に対し斜め方向から形成して得られることを特徴と
する特許請求の範囲第２項記載の反射防止膜付光ファイ
バ。(3) The first layer of diarsenic triselenide and the second layer of potassium chloride are formed in a direction perpendicular to the end surface, and the third layer of arsenic triselenide is formed in an oblique direction to the end surface. An optical fiber with an antireflection film according to claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61152468A JPS638601A (en) | 1986-06-27 | 1986-06-27 | Optical fiber with anti-reflection coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61152468A JPS638601A (en) | 1986-06-27 | 1986-06-27 | Optical fiber with anti-reflection coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS638601A true JPS638601A (en) | 1988-01-14 |
Family
ID=15541170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61152468A Pending JPS638601A (en) | 1986-06-27 | 1986-06-27 | Optical fiber with anti-reflection coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS638601A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0455801A (en) * | 1990-06-26 | 1992-02-24 | Nec Corp | Tip structure of optical fiber |
| US6470380B1 (en) | 1996-12-17 | 2002-10-22 | Fujitsu Limited | Signal processing device accessible as memory |
| KR102584433B1 (en) * | 2022-12-08 | 2023-10-04 | 주식회사 집쇼코리아 | 3D Space Camera System |
-
1986
- 1986-06-27 JP JP61152468A patent/JPS638601A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0455801A (en) * | 1990-06-26 | 1992-02-24 | Nec Corp | Tip structure of optical fiber |
| US6470380B1 (en) | 1996-12-17 | 2002-10-22 | Fujitsu Limited | Signal processing device accessible as memory |
| KR102584433B1 (en) * | 2022-12-08 | 2023-10-04 | 주식회사 집쇼코리아 | 3D Space Camera System |
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