JPS5915916A - Acousto-optic light modulator - Google Patents
Acousto-optic light modulatorInfo
- Publication number
- JPS5915916A JPS5915916A JP12633382A JP12633382A JPS5915916A JP S5915916 A JPS5915916 A JP S5915916A JP 12633382 A JP12633382 A JP 12633382A JP 12633382 A JP12633382 A JP 12633382A JP S5915916 A JPS5915916 A JP S5915916A
- Authority
- JP
- Japan
- Prior art keywords
- light
- acousto
- lens
- optic
- housing
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
Description
【発明の詳細な説明】
響光学効果を利用した音響光学光変調器に関するもので
各種光学機器に利用する。DETAILED DESCRIPTION OF THE INVENTION This invention relates to an acousto-optic modulator that utilizes the acousto-optic effect and is used in various optical devices.
従来例の構成上その問題点
音響光学光変調器の動作原理を第４図に示すと、（１３
１は音響光学媒体、■は圧電振動子（トランスジユーサ
）、（１５）は高周波発振器、Ｑ６＋（１６ａ）（１６
ｂ）はそれぞれ入射光、非回折光、回折光である。高周
波発振器（Ｉ５）からの信号はトランスジューサ圓によ
り音響光学媒体内を進行する超音波に変換される。この
時一定の角度で入射した光（１６：は超音波により回折
される。その割合は高周波発振器からの電気信号強度に
依存し、回折光（１６Ｂ ）と非回折光（１６１））と
なって出射する。その方向は次の（イ）式で与えられる
。Problems with the structure of the conventional example The operating principle of the acousto-optic modulator is shown in FIG.
1 is an acousto-optic medium, ■ is a piezoelectric vibrator (transducer), (15) is a high frequency oscillator, Q6+ (16a) (16
b) are incident light, undiffracted light, and diffracted light, respectively. The signal from the high frequency oscillator (I5) is converted by the transducer circle into an ultrasound wave that travels within the acousto-optic medium. At this time, the light (16:) incident at a certain angle is diffracted by the ultrasonic wave.The ratio depends on the electric signal intensity from the high frequency oscillator, and becomes diffracted light (16B) and undiffracted light (161)). Emits light. The direction is given by the following equation (a).
２ θ ＝ ｓｉｎ （λ・ｆ／ｖ ） ・・
・・・ ・・・（イ）ここで、λは入射光波長、ｆは
超音波周波数、■は音響光学媒体内の音速である。2 θ = sin (λ・f/v) ・・
(a) Here, λ is the wavelength of incident light, f is the ultrasonic frequency, and ■ is the speed of sound in the acousto-optic medium.
このような音響光学光変調器を使用する場合、その応答
性は入射光ビームを超音波が横断する時間ｔに比例し；
口）式で表わすことができる。When using such an acousto-optic light modulator, its responsivity is proportional to the time t that the ultrasound wave traverses the incident light beam;
It can be expressed by the following formula:
ｔ６； ｄ／ｖ ・・・ ・・・・・・（ロ）ここでｄ
は入射光ビーム径である。従って高速で応答させるため
にはビーム径は小さい程よいので一般的にレンズにより
光を絞って使用される。t6; d/v ・・・・・・・・・(b) Here d
is the incident light beam diameter. Therefore, in order to achieve a high-speed response, the smaller the beam diameter, the better, and therefore, the beam is generally used by focusing the light with a lens.
この際に上記レンズと音響光学光変調器とは、入射光０
１１）が超音波波面に対し、フラッグ角（０）となるよ
うに精密に調整することが必要であり、通常その精度は
数ミリラジアン以内でなけれは十分な回折光の強度が得
られない。同様に入射光（１６１は平行度の良い光ビー
ムである必要があるので光ケーブルから出射した光を入
射光として用いる場合には必ずレンズを使用しなければ
ならない。このため、実装時には光学系の角度調整を精
度よく行なう必要かあるため、これらに要する機構とし
て、形状が大きくなることや調整に時間がかかることな
との欠点を有情る。At this time, the lens and the acousto-optic modulator are arranged so that the incident light is 0.
11) must be precisely adjusted so that it becomes the flag angle (0) with respect to the ultrasonic wavefront, and usually the accuracy must be within several milliradians in order to obtain a sufficient intensity of the diffracted light. Similarly, the incident light (161) must be a well-paralleled light beam, so if the light emitted from the optical cable is used as the incident light, a lens must be used. Since it is necessary to make adjustments with high precision, the mechanisms required for these have drawbacks such as a large size and a time-consuming adjustment.
発明の目的
同一筐体内に各部品を予め設置しておくことによって、
内勤な微調整をする必要かほとんどなし１うえに、入射
ビーム径も自由に設定できる、小型で取扱いがきわめて
簡単な音響光学光変調器を提供すること（こある。Purpose of the invention By installing each component in the same housing in advance,
An object of the present invention is to provide an acousto-optic modulator that is small and extremely easy to handle, with almost no need for manual fine-tuning, and in which the incident beam diameter can be freely set.
発明の構成
同一筐体内に光導入用ケーブル、円形断面を有するレン
ズ及び回転機構上に取付けられた音響光学素子を、順次
光進路上に位置するように収納した。前記レンズは光導
入用ケーブルと音響光学素子の間に位置し、このレンズ
が接触しなから前記光進路上を摺動てきるようにした溝
を設け、入射光ビーム径をレンズの位置によって調節で
きるようにした。Structure of the Invention: A light introduction cable, a lens having a circular cross section, and an acousto-optic element mounted on a rotation mechanism are housed in the same housing so as to be positioned in sequence on the optical path. The lens is located between the light introducing cable and the acousto-optic element, and a groove is provided so that the lens can slide on the optical path without contact, and the diameter of the incident light beam is adjusted by the position of the lens. I made it possible.
実施例の説明
第１図において（１）は音響光学素子番こトランスジュ
ーサを接着して成る音響光学素子であり第４図により説
明した動作をするものである。（２）はこれを回転可能
に載せる回転機構、（３）は光導入用ケーブル、（４）
は円形断面を有するレンズ、（５）は光進路」−をレン
ズ（４）を摺動させて適切な位置に固定するための溝、
（６）は筐体、（７］ （７ａ ） （７ｂ ）はそれ
ぞれ音響光学素子（１）（こ対する人絹光、非回折光、
回折光であり、（８）は音響光学素子と駆動用の高周波
発振器間のイしピータンス整合をとるための回路、（９
１（９Ｂ ）は音響光学素子（１］と回路（８）とを接
続するり一ド線、００Ｂ１０Ｂ）は回路（８）とコネク
ク旧１とを接続するリード線である。DESCRIPTION OF THE EMBODIMENTS In FIG. 1, (1) is an acousto-optic device formed by bonding an acousto-optic transducer, which operates as explained in FIG. 4. (2) is a rotating mechanism that rotatably places this, (3) is a cable for optical introduction, (4)
(5) is a lens having a circular cross section; (5) is a groove for sliding the lens (4) and fixing it in an appropriate position;
(6) is the housing, (7) (7a) and (7b) are the acousto-optic elements (1) (corresponding to human light, undiffracted light,
(8) is a circuit for matching the amplitude between the acousto-optic element and the high-frequency oscillator for driving; (9) is the diffracted light;
1 (9B) is a lead wire that connects the acousto-optic element (1) and the circuit (8), and 00B10B) is a lead wire that connects the circuit (8) and the connector 1.
光導入用ケーブル（３）は筐体（６）に固定されており
、ここから出射した光はレンズ（４）により絞られ、入
射光（７）となって音響光学素子（υに入射する。レン
ズ（４）はセルフォックレンズ等の円形断面を有するも
のが使用され光導入用ケーブルからの光進路上を溝（５
）をガイドとして摺動することにより音響光学素子内で
の光ビーム径を適宜設定したのち接着剤等で固定される
。音響光学素子（１）は回転機構（２）（こ固定された
状態で、回転機構（２）を調整することにより入射光（
７）に対しフラッグ角（０）となる位置に設定した後、
筐体に固定される。このように構成ずれは、例えば光導
入用ケーブルの光入射端をコネクタＧこすると、使用時
には、光源からの光と高周波発振器からの電気信号とを
プラグイン弐（こ接続するだけてよいことになり、従来
必要であった光源に対する位置調整は不要となる。さら
に筐体（４小型（こまとめることができるたけてなく、
使用時は筐体を任意の場所（こ設置でき、極めて実用白
′すな音響光学光変調器となる。The light introduction cable (3) is fixed to the housing (6), and the light emitted from it is focused by the lens (4) and becomes incident light (7), which enters the acousto-optic element (υ). The lens (4) has a circular cross section such as a selfoc lens, and a groove (5) is used on the optical path from the light introduction cable.
) is used as a guide to appropriately set the diameter of the light beam within the acousto-optic element, and then fixed with an adhesive or the like. The acousto-optic element (1) is fixed to the rotating mechanism (2), and by adjusting the rotating mechanism (2), the incident light (
After setting the flag angle (0) for 7),
Fixed to the casing. Such a configuration difference can be caused by, for example, rubbing the light input end of the light introduction cable with connector G, and when using it, the light from the light source and the electrical signal from the high frequency oscillator can be connected by plugging in. This eliminates the need to adjust the position of the light source, which was necessary in the past.
When in use, the casing can be placed anywhere, making it an extremely practical acousto-optic modulator.
第２図は他実施例を示し、レンズ（４）とＭ贅光学素子
（υとの間に光反射板０２）を設け、入射光０）光進路
を直角方向番こ変換するよう番こしているので光導入用
ケーブル（３）と亀気入カコネクタ旧１七を筐体（０）
の同一側面に設けることかでき、筐体全体は極めて小型
にすることができる。FIG. 2 shows another embodiment, in which a light reflection plate 02 is provided between the lens (4) and the M-shaped optical element (υ), and the light path of the incident light (0) is arranged so as to be transformed in the right angle direction. Since there is an optical introduction cable (3) and a turtle connector old 17 attached to the casing (0)
The entire housing can be made extremely compact.
尚、第３図（ａ）及び（ｂ）はそれぞれ、レンズと溝の
構成を示す実施例の断面図である。Incidentally, FIGS. 3(a) and 3(b) are sectional views of an embodiment showing the structure of the lens and the groove, respectively.
発明の効果
光源に対して光学系の角度調整を高精度をもってする必
要がないので装置は任意の場所に設置することができる
たけてなく、角度調整番こ要する機構も省略できるので
小型化がｎ」能となることと相まって、極めて取扱いか
簡単な機器を提供することができた。Effects of the Invention Since there is no need to adjust the angle of the optical system with high precision with respect to the light source, the device can be installed at any desired location, and the mechanism required for angle adjustment can be omitted, so miniaturization is possible. In combination with this capability, we were able to provide equipment that was extremely easy to handle.
第１図、第２図は本発明による音響光学光’４１ ＷＩ
Ｍ器の一実施例を示す配置図、第３図（ａ）（１））は
本発明による実施例を示ずレンズと溝との関係の断面図
、第４図は音響光学光変調器の動作原理図である。
（１）・・・音響光学素子、（２）・・・回転機構、（
３）・・光導入用ケーフル、（４）・・・レンス、（５
）・・溝、（６）・・筐体、（７）・・・入射光、（７
ａ）・・・非回折光、（７ｂ）・・・回折光、（８）・
・インピータンス整合用回路、（９Ｂ９ａ）・・ リー
ド線、（ｌ（１） （１０ａ ） ・・ リード線、（
］ＩＪ＋ｔ・＋２コネクタ、（１２＋・・・光反射板、
（１３）・・・音響光学媒体、旧１・・圧電振動子、０
５）・・・高周波発振器
代理人 弁理士人 島 −公
第１図
第２図Figures 1 and 2 show the acousto-optic light '41 WI according to the present invention.
3(a) (1)) is a sectional view showing the relationship between the lens and the groove, and FIG. It is a diagram of the principle of operation. (1)...Acousto-optic element, (2)...Rotation mechanism, (
3)...Cable for light introduction, (4)...Lens, (5
)...groove, (6)...casing, (7)...incident light, (7
a)...Non-diffracted light, (7b)...Diffracted light, (8)...
・Impedance matching circuit, (9B9a)... Lead wire, (l(1) (10a)... Lead wire, (
] IJ+t/+2 connector, (12+... light reflection plate,
(13)...Acousto-optic medium, former 1...Piezoelectric vibrator, 0
5)...High-frequency oscillator agent Patent attorney Shima-Ko Figure 1 Figure 2
Claims (2)
音響光学素子を順次収納すると共に、前記レンズが前記
光進路上を摺動できる溝を設け、尚記音響光学素子に入
射する光ビーム径を調節可能にしたことを特徴とする音
響光学光変調器。(1) Optical introduction cable on the optical path within the same housing. A lens having a circular cross section and an acousto-optic element mounted on a rotation mechanism are sequentially accommodated, and a groove is provided in which the lens can slide on the optical path, and the diameter of the light beam incident on the acousto-optic element is adjusted. An acousto-optic light modulator characterized by making it possible.
を筐体の同一面ｌこ設け、光進路に光反射板を設けた特
許請求の範囲第１項記載の音響光学光変調器。(2) The acousto-optic light modulator according to claim 1, wherein the light introduction cable and the electric power section of the acousto-optic element are provided on the same surface of the casing, and a light reflecting plate is provided in the light path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12633382A JPS5915916A (en) | 1982-07-19 | 1982-07-19 | Acousto-optic light modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12633382A JPS5915916A (en) | 1982-07-19 | 1982-07-19 | Acousto-optic light modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5915916A true JPS5915916A (en) | 1984-01-27 |
Family
ID=14932581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12633382A Pending JPS5915916A (en) | 1982-07-19 | 1982-07-19 | Acousto-optic light modulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5915916A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63135325U (en) * | 1987-02-25 | 1988-09-06 |
-
1982
- 1982-07-19 JP JP12633382A patent/JPS5915916A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63135325U (en) * | 1987-02-25 | 1988-09-06 |
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