JPH01307709A - Incident coupling structure to optical fiber - Google Patents
Incident coupling structure to optical fiberInfo
- Publication number
- JPH01307709A JPH01307709A JP13876288A JP13876288A JPH01307709A JP H01307709 A JPH01307709 A JP H01307709A JP 13876288 A JP13876288 A JP 13876288A JP 13876288 A JP13876288 A JP 13876288A JP H01307709 A JPH01307709 A JP H01307709A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- face
- medium
- light
- destruction
- 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 38
- 230000008878 coupling Effects 0.000 title claims description 6
- 238000010168 coupling process Methods 0.000 title claims description 6
- 238000005859 coupling reaction Methods 0.000 title claims description 6
- 230000006378 damage Effects 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000003902 lesion Effects 0.000 description 2
- 230000001225 therapeutic effect Effects 0.000 description 2
- 206010003210 Arteriosclerosis Diseases 0.000 description 1
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 208000007536 Thrombosis Diseases 0.000 description 1
- -1 XeCl Chemical class 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 208000011775 arteriosclerosis disease Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 210000003708 urethra Anatomy 0.000 description 1
Classifications
-
- 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
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は、光ファイバを使用したレーザー手術装置等
におけるレーザー光から光ファイバへの入射結合部の構
造に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a structure of an input coupling portion from a laser beam to an optical fiber in a laser surgical device using an optical fiber.
〈従来の技術〉
従来より、例えば動脈硬化による血管の狭窄もしくは閉
塞、血栓の形成、または腎臓、尿道における結石等を除
去する治療診断装置ないし治療診断方法が種々発明され
ている。<Prior Art> Various therapeutic and diagnostic apparatuses and therapeutic and diagnostic methods have been invented to remove, for example, narrowing or occlusion of blood vessels due to arteriosclerosis, formation of blood clots, stones in the kidney or urethra, and the like.
その一つとして、光ファイバを体外から管腔に挿入し、
ＹＡＧレーザ−、アルゴンレーザー等からのレーザー光
を光フアイバ先端から照射して病変部を直接蒸散させて
しまう治療が行われている。One method is to insert an optical fiber into the lumen from outside the body,
Treatment is performed in which a laser beam from a YAG laser, an argon laser, or the like is irradiated from the tip of an optical fiber to directly evaporate the lesion.
光ファイバから出射されるレーザー光はレンズ等でスポ
ット状に集光できるので、病変部のみを選択的に除去す
ることができ、かつ、レーザー光源の出力を調節するこ
とにより高精度のパワーコントロールが可能である。The laser light emitted from the optical fiber can be focused into a spot using a lens, etc., so only the lesion can be selectively removed, and the power can be controlled with high precision by adjusting the output of the laser light source. It is possible.
特に最近は、生体吸収率の大きな紫外線を照射し、かつ
パルス発振させることで周辺への熱拡散を防止できる、
ＸｅＣ１，ＫｒＦ、ＡｒＦ等の希ガスハライドのエキシ
マレーザ−が注目されている。In particular, recently, it is possible to prevent heat diffusion to the surrounding area by irradiating ultraviolet rays with high bioabsorption rate and oscillating them in pulses.
Excimer lasers using rare gas halides such as XeCl, KrF, and ArF are attracting attention.
〈発明が解決しようとする課題〉
ところで、高エネルギー密度のビームを照射するレーザ
ーにあっては、光フアイバ入射端面が光破壊される現象
が生じる。破壊の原因はいろいろ考えられるが、端面で
発生したプラズマによる破壊が最も有力である。<Problems to be Solved by the Invention> By the way, in the case of a laser that irradiates a beam with high energy density, a phenomenon occurs in which the input end face of the optical fiber is destroyed by light. There are various possible causes of destruction, but the most likely cause is plasma generated at the end face.
特に、上記エキシマレーザ−のようにパルスレ−ザーで
は、単パルスのエネルギー密度が高いので、破壊現象が
生じやすい。さらに、パルスレーザ−の場合、平均出力
は安定していても、各パルスのレベルに変動があるので
、平均出力を低く設定していても、高レベルのパルス光
が入ると破壊されることがある。In particular, in a pulsed laser such as the excimer laser described above, the energy density of a single pulse is high, so that destructive phenomena are likely to occur. Furthermore, in the case of pulsed lasers, even if the average output is stable, the level of each pulse fluctuates, so even if the average output is set low, it may be destroyed by high-level pulsed light. be.
この発明は上記の問題点に鑑みてなされたものであり、
光ファイバに高エネルギーのレーザー光に対して光ファ
イバの入射端面を保護できる光ファイバへの入射結合構
造を提供することを目的としている。This invention was made in view of the above problems,
The object of the present invention is to provide an input coupling structure to an optical fiber that can protect the input end face of the optical fiber against high-energy laser light.
く課題を解決するための手段〉
上記の目的を達成するためのこの発明の光ファイバへの
入射結合構造は、レーザー光が入射する光ファイバの入
射端面を、光ファイバの入射端面に比べて光破壊閾値の
低い媒質で浸漬した構造である。Means for Solving the Problems> In order to achieve the above object, the optical fiber input coupling structure of the present invention makes the input end face of the optical fiber into which the laser beam enters, compared to the input end face of the optical fiber. It is a structure immersed in a medium with a low failure threshold.
上記光ファイバの入射端面よりも光破壊閾値の低い媒質
とは、光ファイバの入射端面が破壊される程度のエネル
ギーよりも低いエネルギーを有する光と作用して光吸収
率、屈折率等の物性を変化させる媒質をいう。例えば、
レーザー光の多光子吸収によりイオン化する媒質、誘導
ラマン散乱効果を生じる媒質、光強度に応じた屈折率変
化を示す３次の非線形光学媒質等があげられ、これらの
条件を満足する媒質として、はとんどの液体（溶液を含
む）があげられる。A medium with a lower optical destruction threshold than the input end face of the optical fiber is a medium that interacts with light having energy lower than the energy that destroys the input end face of the optical fiber, and changes physical properties such as light absorption rate and refractive index. Refers to the medium to be changed. for example,
Examples include a medium that ionizes due to multiphoton absorption of laser light, a medium that produces a stimulated Raman scattering effect, and a third-order nonlinear optical medium that exhibits a change in refractive index depending on the light intensity. Most liquids (including solutions) can be mentioned.
く作用〉
上記の構成によれば、レーザー光源から出射された高エ
ネルギーのレーザー光を、上記光ファイバの入射端面に
比べて光破壊閾値の低い媒質に導くことによって、当該
媒質内での破壊現象を促進し、当該媒質の吸収率、屈折
率等を変化させることができる。したがって、光ファイ
バの入射端面に到達する光の量を減らすことができ、光
フアイバ入射端面の破壊または損傷を押さえることがで
きる。Effect> According to the above configuration, by guiding the high-energy laser beam emitted from the laser light source to a medium whose optical destruction threshold is lower than that of the incident end face of the optical fiber, the destruction phenomenon within the medium is suppressed. can be promoted and the absorption rate, refractive index, etc. of the medium can be changed. Therefore, the amount of light reaching the input end face of the optical fiber can be reduced, and destruction or damage to the input end face of the optical fiber can be suppressed.
〈実施例〉
次いで、この発明の実施例について図を参照しながら以
下に説明する。<Example> Next, an example of the present invention will be described below with reference to the drawings.
第１図は、レンズ等により集光されたレーザー光が入射
する光ファイバ（４）の入射端面（４１）を密閉容器■
で覆い、密閉容器０の中をＣ８ｚ液で浸漬したものであ
る。密閉容器■の一面には、レーザー光入射用の透明窓
（３）が設けられている。Figure 1 shows an entrance end face (41) of an optical fiber (4) into which a laser beam focused by a lens etc. enters into a sealed container.
The inside of the sealed container 0 was immersed in C8z liquid. A transparent window (3) for laser beam incidence is provided on one side of the closed container (2).
上記の構成によって、高エネルギー光が入射しても、Ｃ
３２を通過したときに、ＣＳ２が自己収束により屈折率
変化を起すので、光ファイバ（４）の入射端面（４１）
におけるビームの分布を拡げることができ、もって、光
ファイバを破壊から保護することができる。With the above configuration, even if high energy light is incident, C
32, CS2 causes a change in refractive index due to self-convergence, so that the incident end face (41) of the optical fiber (4)
The distribution of the beam can be widened, thereby protecting the optical fiber from damage.
第２図は、レーザー光の焦点（Ｐ）を光ファイバ（４）
の入射端面（４１）より手前に設定した構成を示す図で
ある。Figure 2 shows the focus (P) of the laser beam on the optical fiber (4).
FIG. 4 is a diagram showing a configuration set in front of the incident end surface (41) of the optical system.
これによれば、焦点（Ｐ）に光が集まるので、光エネル
ギー密度が飛躍的に増加し、液体の破壊を容易に起すこ
とができるようになる。なお、第２図において、密閉容
器（２′）全体を透明な物質で形成しているので、透明
窓（３）は不要となっている。According to this, since the light is concentrated at the focal point (P), the light energy density increases dramatically, and the liquid can be easily destroyed. In addition, in FIG. 2, since the entire closed container (2') is made of a transparent material, the transparent window (3) is unnecessary.
〈発明の効果〉
以上のように、この発明によれば、レーザー光が入射す
る光ファイバの入射端面を、光ファイバの入射端面に比
べて光破壊閾値の低い媒質で浸漬したので、光ファイバ
の入射端面が破壊させる前に、当該媒質が破壊され、こ
れによって、光ファイバの破壊ないし損傷を防ぐことが
できる。<Effects of the Invention> As described above, according to the present invention, the input end face of the optical fiber into which the laser beam enters is immersed in a medium with a lower optical destruction threshold than the input end face of the optical fiber, so that the optical fiber is The medium is destroyed before the incident end face is destroyed, thereby preventing destruction or damage to the optical fiber.
第１図は光ファイバへの入射結合構造の一実施例を示す
図、
第２図はレーザー光の焦点を入射端面より手前に設定し
た構成を示す図である。
（１）・・・媒質、（４）・・・光ファイバ、（４１）
・・・入射端面特許出願人 住友電気工業株式会社
代 理 人 弁理士 亀 井 弘 勝
第１図
４］
第２図FIG. 1 is a diagram showing an example of an input coupling structure to an optical fiber, and FIG. 2 is a diagram showing a configuration in which the focal point of the laser beam is set in front of the input end face. (1)...Medium, (4)...Optical fiber, (41)
...Incidence end face patent applicant Sumitomo Electric Industries Co., Ltd. Representative Patent attorney Hiroshi Kamei Figure 1 4] Figure 2
Claims (1)
ファイバの入射端面に比べて光破壊閾値の低い媒質で浸
漬したことを特徴とする光ファイバへの入射結合構造。1. An input coupling structure for an optical fiber, characterized in that the input end face of the optical fiber into which laser light enters is immersed in a medium having a lower optical destruction threshold than the input end face of the optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13876288A JPH01307709A (en) | 1988-06-06 | 1988-06-06 | Incident coupling structure to optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13876288A JPH01307709A (en) | 1988-06-06 | 1988-06-06 | Incident coupling structure to optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01307709A true JPH01307709A (en) | 1989-12-12 |
Family
ID=15229593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13876288A Pending JPH01307709A (en) | 1988-06-06 | 1988-06-06 | Incident coupling structure to optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01307709A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130299235A1 (en) * | 2011-01-20 | 2013-11-14 | Hideomi Adachi | Electrical Conduction Path Structure and Wiring harness Incorporating the Same |
-
1988
- 1988-06-06 JP JP13876288A patent/JPH01307709A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130299235A1 (en) * | 2011-01-20 | 2013-11-14 | Hideomi Adachi | Electrical Conduction Path Structure and Wiring harness Incorporating the Same |
| US9358936B2 (en) * | 2011-01-20 | 2016-06-07 | Yazaki Corporation | Electrical conduction path structure and wiring harness incorporating the same |
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