JPS63100420A - Light dividing optical device - Google Patents
Light dividing optical deviceInfo
- Publication number
- JPS63100420A JPS63100420A JP24533286A JP24533286A JPS63100420A JP S63100420 A JPS63100420 A JP S63100420A JP 24533286 A JP24533286 A JP 24533286A JP 24533286 A JP24533286 A JP 24533286A JP S63100420 A JPS63100420 A JP S63100420A
- Authority
- JP
- Japan
- Prior art keywords
- light
- reflector
- signal
- intensity
- differential amplifier
- 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
- 230000003287 optical effect Effects 0.000 title claims description 19
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 230000007246 mechanism Effects 0.000 abstract description 13
- 239000013307 optical fiber Substances 0.000 description 7
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明はレーザ光等の光を分割する光学装置に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an optical device that splits light such as a laser beam.
［従来の技術］
通常、レーザ光等を２光束に分割するためには、ビーム
スプリッタと呼ばれる半透明鏡が使用されている。この
ビームスプリッタは、透明なガラス基板上に屈折率の異
なる物質を多層にコーティングして使用している。[Prior Art] Normally, a semi-transparent mirror called a beam splitter is used to split a laser beam or the like into two beams. This beam splitter uses a transparent glass substrate coated with multiple layers of materials having different refractive indexes.
［発明が解決しようとする問題点］
このビームスプリッタの透過光と反射光との比率は、コ
ーティングの段階で決定されてしまい、例えば、１：１
の分割比率となるように多１１幕をコーティングしたビ
ームスプリッタは、この比率で固定されており、２種の
光の強度比を、例えば、１：３．１：５のように変化さ
せたい場合には、その都度、光学系に配置されているビ
ームスプリッタを所望の分割比のビームスプリッタに交
換しなければならず、面倒である。又、細かく光の強度
の比を変える必要のある光学系では、それだけ多くのビ
ームスプリッタを用意しなければならず、コストアップ
になる。更に、いくら多数のビームスプリッタを用意し
たとしても、連続的に光の強度比を変えることは不可能
である。[Problems to be Solved by the Invention] The ratio of transmitted light and reflected light of this beam splitter is determined at the coating stage, and is, for example, 1:1.
A beam splitter coated with 11 curtains has a splitting ratio of In this case, the beam splitter disposed in the optical system must be replaced each time with a beam splitter having the desired splitting ratio, which is troublesome. Furthermore, in an optical system that requires finely changing the ratio of light intensities, it is necessary to prepare a correspondingly large number of beam splitters, which increases costs. Furthermore, no matter how many beam splitters are prepared, it is impossible to continuously change the light intensity ratio.
本発明は、上述した点に鑑みてなされたもので、簡単な
構成により連続的に光の強度比を変えることができる光
学系を提供することを目的としている。The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an optical system that can continuously change the intensity ratio of light with a simple configuration.
［問題点を解決するための手段］
本発明に基づく光分割光学装置は、被分割光の光路上に
配置された２種の反射面を有する反射体と、該２種の反
射面に入射する光の反射面積の比率を変え得るように該
反射体を移動するための移動手段と、該２種の反射面に
よって分割された光の強度を検出する手段と、該２１１
の検出信号の強度比と設定強度比とを比較し、該比較に
基づいて該第１の反射体の移動を１１１１１する１１ｔ
ｓ手段とを有していることを特徴としている。[Means for Solving the Problems] A light splitting optical device based on the present invention includes a reflector having two types of reflective surfaces disposed on the optical path of light to be split, and a light beam that is incident on the two types of reflective surfaces. a moving means for moving the reflector so as to change the ratio of reflection areas of the light; a means for detecting the intensity of the light divided by the two types of reflecting surfaces;
11t, which compares the intensity ratio of the detection signal with the set intensity ratio, and moves the first reflector 11111 based on the comparison;
s means.
［実施例］ 以下本発明の一実施例を添附図面に基づいて詳述する。[Example] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
図中１は、図示していないレーザ発振器から発生したレ
ーザ光りが入射するコリメータレンズであり、該コリメ
ータレンズ１の出射光は、反射面Ａ、Ｂを有した第１の
反射体である光分割プリズム２に入射する。該反射面Ａ
によって反射された光は第２の反射体３によって反射さ
れ、該反射面已によって反射された光は第３の反射体４
によって反射される。５は該第２の反射体３によって反
射された光を第１の光ファイバー６の入射端に導くため
の光学レンズ、７は該第３の反射体４によって反射され
た光を第２の光ファイバー８の入射端に導くための光学
レンズである。９は該第２の反射体によって反射された
光の光路上に配置された半透明鏡、１０は該半透明ｔＡ
９によって反射された光を検出する光検出器であり、１
１は該第３の反射体によって反射された光の光路上に配
置された半透明鏡、１２は該半透明ｌ！１１によって反
射された光を検出する光検出器である。該光検出器１０
の出力信号は、第１の差動増幅器１３の一方の端子に供
給されるが、該第１の差動増幅器１３の他端には、基準
電源１４の出力電圧が分割抵抗１５によって分割されて
供給されている。該分割抵抗１５によって分割された他
方の電圧は、第２の差動増幅器１６の一端に供給されて
いるが、該第２の差動増幅器１６の他端には、該光検出
器１２の出力信号が供給されている。該第１と第２の差
動増幅器１３．１６の出力信号は、夫々第３の差動増幅
器１７に供給されている。該第３の差動増幅器１７の出
力信号は、制御回路１８に供給されている。該制御回路
１８は、光分割プリズム２の移動機構１９．第２の反射
体３の移動機構２０、第３の反射体４の移動機構２１を
制御している。なお、２２．２３は夫々光ファイバー６
．８への光の入射を随時阻止するために配置された光シ
ヤツターである。Reference numeral 1 in the figure is a collimator lens into which laser light generated from a laser oscillator (not shown) enters, and the emitted light from the collimator lens 1 is split into a first reflector having reflective surfaces A and B. The light enters prism 2. The reflective surface A
The light reflected by the second reflector 3 is reflected by the second reflector 3, and the light reflected by the reflective surface is reflected by the third reflector 4.
reflected by. 5 is an optical lens for guiding the light reflected by the second reflector 3 to the input end of the first optical fiber 6, and 7 is for guiding the light reflected by the third reflector 4 to the second optical fiber 8. This is an optical lens for guiding the light to the incident end of the 9 is a semi-transparent mirror placed on the optical path of the light reflected by the second reflector; 10 is the semi-transparent tA;
9 is a photodetector that detects the light reflected by 1.
1 is a semi-transparent mirror placed on the optical path of the light reflected by the third reflector; 12 is the semi-transparent l! 11 is a photodetector that detects the light reflected by the photodetector. The photodetector 10
The output signal of the reference power supply 14 is supplied to one terminal of the first differential amplifier 13, and the output voltage of the reference power supply 14 is divided by the dividing resistor 15 and the output signal of the reference power supply 14 is supplied to the other terminal of the first differential amplifier 13. Supplied. The other voltage divided by the dividing resistor 15 is supplied to one end of the second differential amplifier 16, and the output of the photodetector 12 is supplied to the other end of the second differential amplifier 16. signal is being supplied. The output signals of the first and second differential amplifiers 13, 16 are supplied to a third differential amplifier 17, respectively. The output signal of the third differential amplifier 17 is supplied to a control circuit 18. The control circuit 18 controls a movement mechanism 19 for the light splitting prism 2. A moving mechanism 20 for the second reflector 3 and a moving mechanism 21 for the third reflector 4 are controlled. In addition, 22 and 23 are optical fibers 6, respectively.
．． This is a light shutter arranged to block light from entering the shutter 8 at any time.
上述した如き構成において、被分割レーザ光りは、光分
割プリズム２に入射し１反射面ａと反射面Ｂによって反
射した２種の光に分割され、一方の光は第２の反射体３
によって反射されて第１の光ファイバー６に導かれ、他
方の光は第３の反射体４によって反射されて第２の光フ
ァイバ８に導かれて所定の用途に用いられる。ここで、
第１の反射体である光分割プリズム２を図中矢印で示し
たＸ方向に移動させれば、反射面Ａと反射面Ｂに入射す
る光の面積が変化し、その結果、第１と第２の光ファイ
バー６．８に入射する光の強度比は、該プリズム２のＸ
方向の位置に応じて連続的に変化することになる。In the configuration as described above, the laser beam to be split enters the light splitting prism 2 and is split into two types of light reflected by the first reflecting surface a and the reflecting surface B, and one of the lights is reflected by the second reflecting surface 3.
The other light is reflected by the third reflector 4 and guided to the second optical fiber 8, and is used for a predetermined purpose. here,
If the light splitting prism 2, which is the first reflector, is moved in the X direction indicated by the arrow in the figure, the area of the light incident on the reflective surfaces A and B changes, and as a result, the area of the light incident on the first and second reflective surfaces A and B changes. The intensity ratio of the light incident on the optical fiber 6.8 of the prism 2 is
It will change continuously depending on the position in the direction.
さて、該プリズム２の位置が移動機構１９によって移動
させられ、図中点線で示した２′の位置に配置されると
、被分割レーザ光りの１００％が該プリズム２の反射面
Ａによって反射され、反射面Ｂに入射する光は皆無とな
る。この時、プリズムの位置が２の時と２′の時とでは
、反射面Ａによつて反射する光の中心軸がずれることに
なる。Now, when the position of the prism 2 is moved by the moving mechanism 19 and placed at the position 2' indicated by the dotted line in the figure, 100% of the laser beam to be split will be reflected by the reflective surface A of the prism 2. , no light enters the reflective surface B. At this time, the central axis of the light reflected by the reflecting surface A is shifted between when the prism is at the position 2 and when the prism is at the position 2'.
そのため、この実施例では、第２の反射［１１３の位置
を該プリズム２の位置の変化に応じてＸ方向に移動させ
、該第２の反射体３によって反射される光の光軸が該反
射面Ａの反射面積の変化によっても変わらないように制
御している。より具体的には、＄１１１１回路１８から
所定の分割比に応じたプリズム２の移動制御信号がプリ
ズム移動機構１９に供給されると、該制御回路１８は、
該プリズムの移動ＩＩＪ御信号に応じた制御信号を第２
の反射体３の移動機構２０に供給し、該反射体３をＸ方
向に移動させる。もちろん、この時、ｖ制御回路１８は
第３の反射体４の移動機構２１にも制御信号を供給し、
該第３の反射体４によって反射される光の中心軸を一定
に維持するようにしている。なお、この実施例では、第
２と第３の反射体３，４を夫々別の移動機構を用いて移
動させるようにしたが、該第２と第３の反射体を一体的
に取付け、単一の移動機構で両者を移動させるように構
成しても良い。Therefore, in this embodiment, the position of the second reflection [113] is moved in the X direction according to the change in the position of the prism 2, so that the optical axis of the light reflected by the second reflector 3 is It is controlled so that it does not change even when the reflection area of surface A changes. More specifically, when a movement control signal for the prism 2 according to a predetermined division ratio is supplied from the $1111 circuit 18 to the prism movement mechanism 19, the control circuit 18
A second control signal corresponding to the prism movement IIJ control signal is
is supplied to the moving mechanism 20 for the reflector 3 to move the reflector 3 in the X direction. Of course, at this time, the v control circuit 18 also supplies a control signal to the moving mechanism 21 of the third reflector 4,
The central axis of the light reflected by the third reflector 4 is kept constant. In this embodiment, the second and third reflectors 3 and 4 are moved using separate moving mechanisms, but the second and third reflectors are integrally attached and can be moved by a single unit. A configuration may be adopted in which both are moved by one moving mechanism.
上述したように、第２と第３の反射体３．４によって反
射された光は、所望の分割比となるが、該反射体夫々に
よって反射された光の光路には、半透明鏡９．１１が配
置されており、該分割光の一部は該牛透鏡によって反射
されて光検出器１０゜１２に検出される。該光検出器１
０．１２の出力信号強度は、夫々、分割された２種の光
の強度に比例している。該２種の検出信号は、第１と第
２の差動増幅器１３．１６に供給されて、夫々分割抵抗
１５によって分割された基準電ＷＡ１４かもの電圧と比
較される。該第１の差動増幅器１３においては、プリズ
ム２の反射１ｆｆｉＡによって反射された光の強度に応
じた信号と、分割抵抗１５によって分割された電圧とを
比較し、その差信号を第３の差動増幅器１７に供給する
。一方、第２の差動増幅５１１６においては、プリズム
２の反射面Ｂによって反射された光の強度に応じた信号
と、分割抵抗１５によって分割された他方の電圧とを比
較し、その差信号を第３の差動増幅器１７の他端に供給
する。該第３の差動増幅Ｂ１７は、供給された２種の信
号の差信号を発生し、＄１１１１１回路１８に供給する
。該１１ｍ回路１８は、該第３の差動増幅！１１７の出
力信号が零になるように駆動機構１９をＭＩＤする。そ
の結果、該プリズム２は、該第３の差動増幅器１７の出
力信号が零となるようにＸ方向に移動させられ、従って
、反射面Ａと８とによって反射される２種の光の強度比
は、該分割抵抗１５における電圧の分割比に等しくされ
る。As described above, the light reflected by the second and third reflectors 3.4 has a desired splitting ratio, but the optical path of the light reflected by each of the reflectors includes a semi-transparent mirror 9.4. 11 is arranged, and a part of the split light is reflected by the cow mirror and detected by the photodetector 10.degree. 12. The photodetector 1
The output signal strength of 0.12 is proportional to the intensity of the two divided lights. The two types of detection signals are supplied to the first and second differential amplifiers 13 and 16, and are compared with the voltage of the reference voltage WA14 divided by the dividing resistor 15, respectively. The first differential amplifier 13 compares the signal corresponding to the intensity of the light reflected by the reflection 1ffiA of the prism 2 and the voltage divided by the dividing resistor 15, and converts the difference signal into a third difference signal. The signal is supplied to a dynamic amplifier 17. On the other hand, the second differential amplification 5116 compares the signal corresponding to the intensity of the light reflected by the reflective surface B of the prism 2 with the other voltage divided by the dividing resistor 15, and calculates the difference signal. It is supplied to the other end of the third differential amplifier 17. The third differential amplifier B17 generates a difference signal between the two types of signals supplied, and supplies it to the $11111 circuit 18. The 11m circuit 18 is the third differential amplification! The drive mechanism 19 is MIDed so that the output signal of the drive mechanism 117 becomes zero. As a result, the prism 2 is moved in the X direction so that the output signal of the third differential amplifier 17 becomes zero, thus reducing the intensity of the two types of light reflected by the reflecting surfaces A and 8. The ratio is made equal to the voltage division ratio at the dividing resistor 15.
以上本発明を詳述したが、本発明は、上述した実施例に
限定されず幾多の変形が可能である＝例えば、第１の反
射体としてプリズムを用いたが、必ずしもプリズムであ
る必要はなく、例えば、２枚の反射鏡を所定の角度で一
体的にした反射体を用いても良い。又、分割レーザ光を
光ファイバーに導（光学系以外の光学系にも本発明を適
用することができる。Although the present invention has been described in detail above, the present invention is not limited to the embodiments described above and can be modified in many ways. For example, although a prism is used as the first reflector, it does not necessarily have to be a prism. For example, a reflector formed by integrating two reflecting mirrors at a predetermined angle may be used. Furthermore, the present invention can be applied to optical systems other than optical systems in which the divided laser beams are guided to optical fibers.
［効果］
以上詳述した如く、本発明は、２種の反射面を有した反
射体を移動させる簡単な光学系により、光を分割できる
と共に、該分割された２１１の光の強度比を連続的に所
望の値とすることができ、更には、分割された光の軸を
一定に維持することができる。[Effects] As described in detail above, the present invention can divide light by using a simple optical system that moves a reflector having two types of reflective surfaces, and can continuously adjust the intensity ratio of the divided 211 lights. In addition, the axis of the divided light can be maintained constant.
【図面の簡単な説明】
添附図面は、本発明の一実施例である光分割光学装置を
示している。
１・・・コリメータレンズ
２・・・光分割プリズム ３・・・第２の反射体４・・
・第３の反射体 ５．７・・・レンズ６．８・・・光
ファイバー
９．１１・・・半透明！＋！１０．１２・・・検出器１
３．１６．１７・・・差動増幅器
１４・・・基準電源 １５・・・分割抵抗１８・
・・ｌｌｌｌ１１回路
１９．２０．２１・・・移動機構
２２．２３・・・シャッターBRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings show a light splitting optical device that is an embodiment of the present invention. 1... Collimator lens 2... Light splitting prism 3... Second reflector 4...
・Third reflector 5.7...Lens 6.8...Optical fiber 9.11...Semi-transparent! +! 10.12...Detector 1
3.16.17... Differential amplifier 14... Reference power supply 15... Dividing resistor 18...
...llll11 circuit 19.20.21...Movement mechanism 22.23...Shutter
Claims (1)
する反射体と、該２種の反射面に入射する光の反射面積
の比率を変え得るように該反射体を移動するための移動
手段と、該２種の反射面によって分割された光の強度を
検出する手段と、該２種の検出信号の強度比と設定強度
比とを比較し、該比較に基づいて該第１の反射体の移動
を制御する制御手段とを有した光分割光学装置(1) A reflector having two types of reflective surfaces placed on the optical path of the light to be split, and moving the reflector so as to change the ratio of the reflection area of light incident on the two types of reflective surfaces. a means for detecting the intensity of the light divided by the two types of reflective surfaces, a means for detecting the intensity of the light divided by the two types of reflecting surfaces, and a means for detecting the intensity of the light divided by the two types of reflective surfaces, and comparing the intensity ratio of the two types of detection signals with a set intensity ratio, and based on the comparison, the A light splitting optical device having a control means for controlling the movement of the reflector of No. 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24533286A JPS63100420A (en) | 1986-10-17 | 1986-10-17 | Light dividing optical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24533286A JPS63100420A (en) | 1986-10-17 | 1986-10-17 | Light dividing optical device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63100420A true JPS63100420A (en) | 1988-05-02 |
Family
ID=17132088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24533286A Pending JPS63100420A (en) | 1986-10-17 | 1986-10-17 | Light dividing optical device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63100420A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55142307A (en) * | 1979-04-24 | 1980-11-06 | Matsushita Electric Ind Co Ltd | Optical axis position correcting device |
| JPS6022113A (en) * | 1983-07-19 | 1985-02-04 | Olympus Optical Co Ltd | Light source device |
-
1986
- 1986-10-17 JP JP24533286A patent/JPS63100420A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55142307A (en) * | 1979-04-24 | 1980-11-06 | Matsushita Electric Ind Co Ltd | Optical axis position correcting device |
| JPS6022113A (en) * | 1983-07-19 | 1985-02-04 | Olympus Optical Co Ltd | Light source device |
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