JP2019074685A - Optical coupling device - Google Patents

Optical coupling device Download PDF

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JP2019074685A
JP2019074685A JP2017201810A JP2017201810A JP2019074685A JP 2019074685 A JP2019074685 A JP 2019074685A JP 2017201810 A JP2017201810 A JP 2017201810A JP 2017201810 A JP2017201810 A JP 2017201810A JP 2019074685 A JP2019074685 A JP 2019074685A
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core
optical fiber
coupling device
laser light
optical
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JP7127268B2 (en
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直也 石垣
Naoya Ishigaki
直也 石垣
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Shimadzu Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4206—Optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/421—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical component consisting of a short length of fibre, e.g. fibre stub

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

To provide an optical coupling device capable of uniformizing intensity of a near field pattern of a laser beam emitted from an optical fiber including a circular core.SOLUTION: An optical coupling device comprises: a laser light source 1 for emitting a laser beam; a lens 2 for condensing the laser beam emitted from the laser light source 1; an optical fiber 3, having a rectangular core 3a, in which the laser beam condensed by the lens 2 is made incident on the rectangular core to generate a uniformized rectangular beam; and an optical fiber 5 that has a circular core 5a and makes the uniformized rectangular beam from the optical fiber 3 incident on the circular core 5a.SELECTED DRAWING: Figure 1

Description

本発明は、レーザ光源からのレーザ光をレンズで集光させて光ファイバに結合させる光結合装置に関する。   The present invention relates to a light coupling device in which laser light from a laser light source is condensed by a lens and coupled to an optical fiber.

従来のこの種の光結合装置として、例えば、特許文献１に記載されたレーザ治療装置が知られている。このレーザ治療装置は、レーザ光源から発生されたレーザ光を、導光路ファイバにその一方端から導入し、導入されたレーザ光を導光路ファイバの出力側に設けられたハンドピースを介して生体患部に照射することにより治療を行う。   As a conventional light coupling device of this type, for example, a laser treatment device described in Patent Document 1 is known. This laser treatment apparatus introduces laser light generated from a laser light source into a light guide fiber from one end thereof, and introduces the introduced laser light through a handpiece provided on the output side of the light guide fiber. The treatment is done by

導光路ファイバの光伝搬機能を有するコア部材の横断面形状を多角形とし、導光路ファイバの他方端に握り部材を構成してハンドピースを構成している。   The cross-sectional shape of the core member having the light propagation function of the light guide path fiber is a polygon, and the grip member is configured at the other end of the light guide path fiber to configure the hand piece.

この光結合装置によれば、導光路ファイバに入射されたレーザ光は、四方の壁で全反射を繰り返し、方形形状ファイバの横断面いっぱいに広がった均一のエネルギー分布となって導光路ファイバの出力端から出射される。このため、透過効率の良いレーザ治療装置を得ることができる。   According to this optical coupling device, the laser light incident on the light guide fiber repeats total reflection on the walls of the four sides, resulting in a uniform energy distribution spread over the entire cross section of the rectangular fiber, and the output of the light guide fiber It is emitted from the end. For this reason, it is possible to obtain a laser treatment apparatus with good transmission efficiency.

このように、断面が方形状に形成された方形コアを備えた光ファイバでは、レーザ光のニアフィールドパターン（レーザ光源の出力端近傍のビームパターン）における強度が均一分布になる。   As described above, in the optical fiber provided with the square core whose cross section is formed in a square shape, the intensity in the near-field pattern of the laser light (the beam pattern near the output end of the laser light source) becomes uniform distribution.

特公平３−４９５９１号公報Japanese Examined Patent Publication No. 3-49591

しかしながら、断面が円形状に形成されたコアを備えた光ファイバでは、出射されるレーザ光のニアフィールドパターンにおける強度分布がガウス分布になってしまう。   However, in an optical fiber provided with a core whose cross section is formed in a circular shape, the intensity distribution in the near-field pattern of the emitted laser beam becomes a Gaussian distribution.

このため、円形コアを含む光ファイバから出射されるレーザ光のニアフィールドパターンを均一強度にすることが望まれていた。   Therefore, it has been desired to make the near-field pattern of laser light emitted from an optical fiber including a circular core uniform.

本発明の課題は、円形コアを含む光ファイバから出射されるレーザ光のニアフィールドパターンを均一強度にすることができる光結合装置を提供する。   An object of the present invention is to provide an optical coupling device capable of making the near-field pattern of laser light emitted from an optical fiber including a circular core uniform in intensity.

本発明に係る光結合装置の請求項１は、レーザ光を出射するレーザ光源と、前記レーザ光源から出射されたレーザ光を集光する集光レンズと、多角形コアを有し、前記集光レンズで集光されたレーザ光を前記多角形コアに入射して均一化された多角形ビームを生成する第１の光ファイバと、円形コアを有し、前記第１の光ファイバからの均一化された多角形ビームを前記円形コアに入射する第２の光ファイバとを備えることを特徴とする。   Claim 1 of the optical coupling device according to the present invention comprises a laser light source for emitting a laser beam, a condensing lens for condensing the laser beam emitted from the laser light source, and a polygon core, A first optical fiber for generating laser light condensed by a lens into the polygon core to generate a homogenized polygon beam, and a circular core, and homogenizing from the first optical fiber And a second optical fiber for making the polygon beam incident on the circular core.

また、請求項２は、前記第２の光ファイバへの入射端面において多角形ビームのプロファイルが前記円形コアに外接する多角形となるように前記多角形ビームの大きさを調整するための光学素子を、前記第１の光ファイバと前記第２の光ファイバとの間に配置したことを特徴とする。   A second aspect of the present invention is an optical element for adjusting the size of the polygon beam so that the profile of the polygon beam becomes a polygon circumscribing the circular core at the incident end face to the second optical fiber. Are disposed between the first optical fiber and the second optical fiber.

また、請求項３において、前記多角形コアは、方形コアからなることを特徴とする。   Further, in claim 3, the polygonal core is characterized by comprising a square core.

本発明によれば、第１の光ファイバの多角形コアで、均一化された多角形ビームを生成し、第１の光ファイバからの均一化された多角形ビームを第２の光ファイバの円形コアに入射するので、第２の光ファイバから出射されるレーザ光のニアフィールドパターンを均一強度にすることができる。   In accordance with the present invention, the polygon core of the first optical fiber produces a homogenized polygon beam, and the homogenized polygon beam from the first optical fiber is a circle of the second optical fiber. Since the light is incident on the core, the near-field pattern of the laser light emitted from the second optical fiber can be made uniform in intensity.

本発明の実施例１の光結合装置の構成図である。It is a block diagram of the optical coupling device of Example 1 of this invention. 本発明の実施例１の光結合装置の方形コアを有する光ファイバの出力端におけるニアフィールドパターンを示す図である。It is a figure which shows the near field pattern in the output end of the optical fiber which has a square core of the optical coupling device of Example 1 of this invention. 本発明の実施例１の光結合装置の円形コアを有する光ファイバ入射面における矩形ビームと円形ファイバコア外形を示す図である。It is a figure which shows the rectangular beam in the optical fiber entrance plane which has a circular core of the optical coupling device of Example 1 of this invention, and a circular fiber core external shape. 本発明の実施例１の光結合装置の円形コアを有する光ファイバの出力端におけるニアフィールドパターンを示す図である。It is a figure which shows the near-field pattern in the output end of the optical fiber which has a circular core of the optical coupling device of Example 1 of this invention. 本発明の実施例２の光結合装置の構成図である。It is a block diagram of the optical coupling device of Example 2 of this invention. 本発明の実施例２の光結合装置の円形コアを有する光ファイバ入射面における５角形コアと円形ファイバコア外形を示す図である。It is a figure which shows the pentagonal core in the optical fiber entrance plane which has a circular core of the optical coupling device of Example 2 of this invention, and a circular fiber core external shape.

以下、本発明の実施形態に係る光結合装置を図面を参照しながら詳細に説明する。   Hereinafter, an optical coupling device according to an embodiment of the present invention will be described in detail with reference to the drawings.

（実施例１）
図１は、本発明の実施例１の光結合装置の構成図である。実施例１の光結合装置は、レーザ光源１、レンズ２、光ファイバ３、レンズ４、光ファイバ５を備えている。 Example 1
FIG. 1 is a block diagram of an optical coupling device according to a first embodiment of the present invention. The optical coupling device of the first embodiment includes a laser light source 1, a lens 2, an optical fiber 3, a lens 4, and an optical fiber 5.

レーザ光源１は、レーザ光を出射するもので、半導体レーザ、固体レーザ等からなる。レンズ２は、本発明の集光レンズに対応し、レーザ光源１から出射されたレーザ光を集光して光ファイバ３の方形コアに導光する。   The laser light source 1 emits laser light and is formed of a semiconductor laser, a solid state laser, or the like. The lens 2 corresponds to the condenser lens of the present invention, condenses the laser light emitted from the laser light source 1, and guides the laser light to the square core of the optical fiber 3.

光ファイバ３は、本発明の第１の光ファイバに対応し、図２（ａ）に示すように、正方形をなす方形コア３ａと方形コア３ａを覆うクラッド３ｂを有して構成されている。   The optical fiber 3 corresponds to the first optical fiber of the present invention, and as shown in FIG. 2A, is configured to have a square core 3a forming a square and a cladding 3b covering the square core 3a.

光ファイバ３は、レンズ２で集光されたレーザ光を方形コア３ａに入射して、均一化された方形ビーム（矩形ビームＢＭ）を生成する。   The optical fiber 3 injects the laser light collected by the lens 2 into the square core 3a to generate a homogenized square beam (rectangular beam BM).

レンズ４は、本発明の光学素子に対応し、光ファイバ３と光ファイバ５との間に配置され、光ファイバ３からの均一化された方形ビーム（矩形ビームＢＭ）を光ファイバ５の円形コア５ａに導光する。   The lens 4 corresponds to the optical element of the present invention, and is disposed between the optical fiber 3 and the optical fiber 5, and the homogenized square beam (rectangular beam BM) from the optical fiber 3 is used as a circular core of the optical fiber 5. Guide light to 5a.

光ファイバ５は、本発明の第２の光ファイバに対応し、図４（ａ）に示すように円形コア５ａと円形コア５ａを覆うクラッド５ｂとを有し、光ファイバ３からの均一化された方形ビームをレンズ４を介して円形コア５ａに入射する。   The optical fiber 5 corresponds to the second optical fiber of the present invention, and has a circular core 5a and a cladding 5b covering the circular core 5a as shown in FIG. The rectangular beam is incident on the circular core 5 a through the lens 4.

また、レンズ４は、光ファイバ５への入射端面において方形ビームＢＭのプロファイルが円形コア５ａのコア外形Ｄ１に外接する四角形となるように方形ビームＢＭの大きさを調整する。   In addition, the lens 4 adjusts the size of the square beam BM so that the profile of the square beam BM at the incident end face to the optical fiber 5 becomes a square circumscribed to the core outline D1 of the circular core 5a.

次にこのように構成された実施例１の光結合装置の動作を図面を参照しながら説明する。   Next, the operation of the photocoupler of the first embodiment configured as described above will be described with reference to the drawings.

ここで、図２（ｂ）は、方形コア３ａを有する光ファイバ３の出力端（図１の（ａ）の位置）におけるニアフィールドパターンを示す。図３は、円形コア５ａを有する光ファイバ入射面（図１の（ｂ）の位置）における矩形ビームＢＭと円形ファイバコア外形Ｄ１を示す。図４（ｂ）は、円形コア５ａを有する光ファイバ５の出力端（図１の（ｃ）の位置）におけるニアフィールドパターンを示している。   Here, FIG. 2 (b) shows the near-field pattern at the output end (the position of FIG. 1 (a)) of the optical fiber 3 having the square core 3a. FIG. 3 shows a rectangular beam BM and a circular fiber core outline D1 at the optical fiber incident surface (the position of (b) in FIG. 1) having the circular core 5a. FIG. 4 (b) shows the near-field pattern at the output end (the position of FIG. 1 (c)) of the optical fiber 5 having the circular core 5a.

まず、レーザ光源１からのレーザ光は、レンズ２により集光されて光ファイバ３の方形コア３ａに導光される。光ファイバ３では、レーザ光を方形コア３ａに入射して、均一化された方形ビーム（矩形ビームＢＭ）を生成する。図２（ｂ）に示すように、方形コア３ａにおけるニアフィールドパターンは、均一強度となる。   First, laser light from the laser light source 1 is collected by the lens 2 and guided to the square core 3 a of the optical fiber 3. In the optical fiber 3, laser light is incident on the square core 3a to generate a homogenized square beam (rectangular beam BM). As shown in FIG. 2 (b), the near-field pattern in the square core 3a has a uniform intensity.

次に、レンズ４は、図３に示すように、光ファイバ５への入射端面において方形ビームＢＭのプロファイルが円形コア５ａのコア外形Ｄ１に外接する四角形となるように方形ビームＢＭの大きさを調整する。具体的には、レンズ４の位置を光軸方向に移動させて方形ビームＢＭの大きさを調整する。   Next, as shown in FIG. 3, the lens 4 measures the size of the square beam BM so that the profile of the square beam BM at the incident end face to the optical fiber 5 becomes a square circumscribed to the core outline D1 of the circular core 5a. adjust. Specifically, the position of the lens 4 is moved in the optical axis direction to adjust the size of the square beam BM.

そして、レンズ４は、光ファイバ３からの均一化された方形ビーム（矩形ビームＢＭ）を光ファイバ５の円形コア５ａに導光する。   Then, the lens 4 guides the homogenized square beam (rectangular beam BM) from the optical fiber 3 to the circular core 5 a of the optical fiber 5.

さらに、光ファイバ５は、光ファイバ３からの均一化された方形ビームをレンズ４を介して円形コア５ａに入射する。   Furthermore, the optical fiber 5 causes the homogenized square beam from the optical fiber 3 to enter the circular core 5 a via the lens 4.

このように実施例１の光結合装置によれば、光ファイバ３の方形コア３ａで、均一化された方形ビームを生成し、光ファイバ３からの均一化された方形ビームを光ファイバ５の円形コア５ａに入射するので、光ファイバ５から出射されるレーザ光のニアフィールドパターンを均一強度にすることができる。   As described above, according to the optical coupling device of the first embodiment, the square core 3 a of the optical fiber 3 generates a homogenized square beam, and the homogenized square beam from the optical fiber 3 is formed into a circle of the optical fiber 5. Since the light is incident on the core 5a, the near-field pattern of the laser light emitted from the optical fiber 5 can be made to have a uniform intensity.

（実施例２）
図５は、本発明の実施例２の光結合装置の構成図である。実施例２の光結合装置は、方形コア３ａを有する光ファイバ３に代えて、六角形コア３０ａを有する光ファイバ３０を用いたことを特徴とする。 (Example 2)
FIG. 5 is a block diagram of an optical coupling device according to a second embodiment of the present invention. The optical coupling device of the second embodiment is characterized in that an optical fiber 30 having a hexagonal core 30a is used instead of the optical fiber 3 having the square core 3a.

図５に示す実施例２の光結合装置のその他の構成は、図１に示す実施例１の光結合装置の構成と同一構成であり、同一部分には、同一符号を付して、その説明は省略する。   The other configuration of the optical coupling device of the second embodiment shown in FIG. 5 is the same as that of the optical coupling device of the first embodiment shown in FIG. 1, and the same reference numerals are given to the same portions. Is omitted.

光ファイバ３０は、図６に示すように、六角形コア３０ａと六角形コア３０ａを覆うクラッド３０ｂを有している。また、レンズ４は、図６に示すように、光ファイバ５への入射端面において六角形ビームのプロファイルが円形コア５ａのコア外形Ｄ１に外接する四角形となるように六角形ビームＢＭの大きさを調整する。   The optical fiber 30, as shown in FIG. 6, has a cladding 30b covering a hexagonal core 30a and a hexagonal core 30a. In addition, as shown in FIG. 6, the lens 4 has a size of the hexagonal beam BM such that the profile of the hexagonal beam becomes a quadrilateral circumscribing the core outline D1 of the circular core 5a at the incident end face to the optical fiber 5 adjust.

そして、レンズ４は、光ファイバ３からの均一化された六角形ビームを光ファイバ５の円形コア５ａに導光する。   The lens 4 then guides the homogenized hexagonal beam from the optical fiber 3 to the circular core 5 a of the optical fiber 5.

このように実施例２の光結合装置によっても、実施例１の光結合装置の効果と同様な効果が得られる。   Thus, the same effects as the effects of the optical coupling device of Example 1 can be obtained by the optical coupling device of Example 2 as well.

なお、本発明は、実施例１及び実施例２の光結合装置に限定されるものではない。実施例１及び実施例２の光結合装置では、光ファイバが方形コアや六角形コアであったが、例えば、三角形コア、五角形コア等の多角形コアであってもよい。   The present invention is not limited to the photocouplers of the first embodiment and the second embodiment. In the optical coupling device of the first embodiment and the second embodiment, the optical fiber is a square core or a hexagonal core, but may be, for example, a polygonal core such as a triangular core or a pentagonal core.

本発明の光結合装置は、レーザ装置に適用可能である。   The optical coupling device of the present invention is applicable to a laser device.

１ レーザ光源
２ レンズ
３ 光ファイバ
３ａ 方形コア
３ｂ クラッド
４ レンズ
５ 光ファイバ
５ａ 円形コア
５ｂ クラッド
３０ 光ファイバ
３０ａ 六角形コア
３０ｂ クラッド
ＢＭ 矩形ビーム
Ｄ１ 円形ファイバコア外形 Reference Signs List 1 laser light source 2 lens 3 optical fiber 3a square core 3b clad 4 lens 5 optical fiber 5a circular core 5b clad 30 optical fiber 30a hexagonal core 30b clad BM rectangular beam D1 circular fiber core outer shape

Claims (3)

レーザ光を出射するレーザ光源と、
前記レーザ光源から出射されたレーザ光を集光する第１の集光レンズと、
多角形コアを有し、前記第１の集光レンズで集光されたレーザ光を前記多角形コアに入射して均一化された多角形ビームを生成する第１の光ファイバと、
円形コアを有し、前記第１の光ファイバからの均一化された多角形ビームを前記円形コアに入射する第２の光ファイバと、
を備えることを特徴とする光結合装置。 A laser light source for emitting laser light;
A first condensing lens for condensing laser light emitted from the laser light source;
A first optical fiber having a polygon core and generating laser light condensed by the first condenser lens into the polygon core to generate a homogenized polygon beam;
A second optical fiber having a circular core, the homogenized polygon beam from the first optical fiber being incident on the circular core;
An optical coupling device comprising: 前記第２の光ファイバへの入射端面において多角形ビームのプロファイルが前記円形コアに外接する多角形となるように前記多角形ビームの大きさを調整するための光学素子を、前記第１の光ファイバと前記第２の光ファイバとの間に配置したことを特徴とする請求項１記載の光結合装置。   An optical element for adjusting the size of the polygon beam so that the profile of the polygon beam becomes a polygon circumscribing the circular core at the incident end face to the second optical fiber, the first light The optical coupling device according to claim 1, wherein the optical coupling device is disposed between a fiber and the second optical fiber. 前記多角形コアは、方形コアからなることを特徴とする請求項１又は請求項２記載の光結合装置。   The optical coupling device according to claim 1 or 2, wherein the polygonal core comprises a square core.
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