JPH04192583A - Frequency-sweep laser apparatus - Google Patents
Frequency-sweep laser apparatusInfo
- Publication number
- JPH04192583A JPH04192583A JP32118190A JP32118190A JPH04192583A JP H04192583 A JPH04192583 A JP H04192583A JP 32118190 A JP32118190 A JP 32118190A JP 32118190 A JP32118190 A JP 32118190A JP H04192583 A JPH04192583 A JP H04192583A
- Authority
- JP
- Japan
- Prior art keywords
- electro
- optical element
- optic element
- laser
- frequency
- 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
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- Lasers (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
この発明は、周波数掃引レーザ装置に関し、もう少し詳
しくいうと、レーザ光を照射対象粒子に照射してして光
吸収を生じさせるための周波数掃引レーザ装置に関する
ものである。[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a frequency sweep laser device, and more specifically, a frequency sweep laser device for irradiating target particles with laser light to cause light absorption. This invention relates to a laser device.
［従来の技術〕
第３図は米国特許第４．８３６．２８７号明細書に示さ
れた従来の周波数掃引レーザ装置であり、図において、
（１）はアルゴンレーザのようなレーザ発生源、（２）
はレーザ発生源（１）から出力されたレーザ光、（３）
はレーザ光（２）の周波数を掃引するための電気光学素
子、（４）は周波数掃引されたレーザ出力光、（５）は
電気光学素子（３）に電界を印加する電力増幅器、（６
）は電力増幅器（５）に制御信号を与える発振器である
。[Prior Art] FIG. 3 shows a conventional frequency sweep laser device shown in U.S. Pat. No. 4,836,287, in which:
(1) is a laser source such as an argon laser, (2)
is the laser beam output from the laser source (1), (3)
is an electro-optical element for sweeping the frequency of the laser beam (2), (4) is the frequency-swept laser output light, (5) is a power amplifier for applying an electric field to the electro-optical element (3), and (6) is an electro-optical element for sweeping the frequency of the laser beam (2).
) is an oscillator that provides a control signal to the power amplifier (5).
次に動作について説明する。レーザ発生源（１）によっ
て発生されたレーザ光（２）は−１周波数掃引を行う電
気光学素子（３）に入力される。このとき、発振器（６
）によって制御される電力増幅器（５）の出力Ｖｘは電
気光学素子（３）内の電界を時間的に変化するように与
えられ、その結果、電−気光学素子（３）内を通る光の
屈折率が時間的に変化する。Next, the operation will be explained. Laser light (2) generated by a laser source (1) is input to an electro-optical element (3) that performs a −1 frequency sweep. At this time, the oscillator (6
) is applied so as to temporally change the electric field within the electro-optical element (3), and as a result, the output Vx of the power amplifier (5) controlled by the electro-optical element (3) is controlled by The refractive index changes over time.
電気光学素子内の屈折率の変化量△ｎは△ｎ＝Ｋｏ−（
ｎ’／２＞ ・Ｅ −・・■で表わされ、このと
きｎは屈折率、Ｋｏは定数である。電界Ｅが時間的に変
動するような電圧が電力増幅器（５）から与えられれば
、レーザ光（２〉の周波数の掃引量 △ｆは
△ｆ＝に、・ ＋ｄ （ｄ△ｎ）／ｄｔ） ・ Ｌ
＝に２ （ｄＥ／ｄｔ） ・ Ｌ
＝に、・ （ｄＶｘ／ｄ ｔ ） ・ Ｌ −■と
なる。ここでＫ １． Ｋ ２ 、 Ｋ ３は定数、Ｌ
はレーザ光が通る電気光学素子（３）内の長さである。The amount of change △n in the refractive index within the electro-optical element is △n=Ko-(
It is expressed as n'/2>·E −···■, where n is the refractive index and Ko is a constant. If a voltage that causes the electric field E to fluctuate over time is applied from the power amplifier (5), the frequency sweep amount △f of the laser beam (2> becomes △f=, +d (d△n)/dt)・L
= 2 (dE/dt) ・L = ・ (dVx/d t ) ・L −■. Here K1. K 2 and K 3 are constants, L
is the length within the electro-optical element (3) through which the laser beam passes.
すなわち、電力増幅器（５）から与えられる電圧Ｖｘの
時間的変化量を制御することで、レーザ光（２）の周波
数が掃引されたレーザ出力が得られる。That is, by controlling the amount of change over time of the voltage Vx applied from the power amplifier (5), a laser output in which the frequency of the laser light (2) is swept can be obtained.
［発明が解決しようとする課題］
従来の周波数掃引レーザ装置は以上のように構成されて
いるので、電気光学素子をに電界を発生させるために電
気光学素子に取付けた電極に高電圧を印加することが必
要で、それに伴い、沿面距離による絶縁破壊が起こるお
それがあった。[Problems to be Solved by the Invention] Since the conventional frequency swept laser device is configured as described above, a high voltage is applied to the electrode attached to the electro-optic element in order to generate an electric field in the electro-optic element. Therefore, there was a risk of dielectric breakdown due to the creepage distance.
この発明は上記のような問題点を解消するためになされ
たもので、電気光学素子に取付けた電極に高電圧を印加
しても絶縁破壊を起こさない周波数掃引レーザ装置を得
ることを目的とする。This invention was made to solve the above-mentioned problems, and its purpose is to obtain a frequency sweep laser device that does not cause dielectric breakdown even when a high voltage is applied to an electrode attached to an electro-optical element. .
［課題を解決するための手段］
この発明に係る周波数掃引レーザ装置は、電気光学素子
の周囲に絶縁油を配置したものである。[Means for Solving the Problems] A frequency swept laser device according to the present invention has an insulating oil arranged around an electro-optical element.
［作 川口
この発明においては、絶縁油を電気光学素子の周囲に配
置することにより、電気光学素子の絶縁破壊強度か増大
する。[Made by Kawaguchi] In this invention, by disposing insulating oil around the electro-optical element, the dielectric breakdown strength of the electro-optical element is increased.
［実施例２ 以下、この発明の一実施例を第１図について説明する。[Example 2 An embodiment of the present invention will be described below with reference to FIG.
図において、（７）は電気光学素子（３）を取巻く絶縁
油、（１０）は絶縁油（７）を収納したケース、（８）
はオイルンーノ呟（９）は絶縁油（７）で囲まれた電気
光学素子（３）にレーザ光を入力あるいは出力するため
のレーザ窓である。In the figure, (7) is the insulating oil surrounding the electro-optical element (3), (10) is the case containing the insulating oil (7), and (8) is the insulating oil surrounding the electro-optical element (3).
The oil window (9) is a laser window for inputting or outputting laser light to the electro-optical element (3) surrounded by insulating oil (7).
次に動作について説明する。レーザ光（２）がレーザ発
生＃（１）から電気−光学素子（３）に入射され、周波
数掃引を行うときに、式■による掃引量△ｆを得るため
に大きなｄＶｘを電気光学素子（３）に印加する。この
とき、電気光学素子（３）は絶縁油で覆われていて大き
な絶縁耐力を有するので、より大きなｄＶｘか印加てき
、大きな周波数掃引量か得られる。Next, the operation will be explained. When the laser beam (2) is incident on the electro-optical element (3) from the laser generator #(1) and performs a frequency sweep, a large dVx is applied to the electro-optical element (3) in order to obtain the sweep amount △f according to formula (■). ). At this time, since the electro-optical element (3) is covered with insulating oil and has a large dielectric strength, a larger dVx can be applied and a larger frequency sweep amount can be obtained.
第２図は他の実施例を示し、電気光学素子（３）−を絶
縁固定板（１１）で固定したものである。その他第１図
と同一符号は同一部分である。FIG. 2 shows another embodiment in which an electro-optical element (3) is fixed with an insulating fixing plate (11). Otherwise, the same reference numerals as in FIG. 1 indicate the same parts.
以上の構成により、装置全体が安定し、安定した周波数
掃引を行うことかできる。With the above configuration, the entire device is stabilized and stable frequency sweep can be performed.
［発明の効果］
以上のように、この発明によれば、電気光学素子の絶縁
強度を増加することができ、より大きな掃引量が得られ
る効果がある。[Effects of the Invention] As described above, according to the present invention, the insulation strength of the electro-optical element can be increased, and a larger sweep amount can be obtained.
第１図はこの発明の一実施例の断面側面図、第２図は他
の実施例の断面側面図、第３図は従来の周波数掃引レー
ザ装置のブロック図である。
（１） ・・レーザ発生源、（３）・・電気光学素子、
（５）・・電力増幅器、（６）・・発振器、（７）・・
絶縁油、（１０）・・ケース。
なお、各図中、同一符号は同−又は相当部分を示す。FIG. 1 is a cross-sectional side view of one embodiment of the present invention, FIG. 2 is a cross-sectional side view of another embodiment, and FIG. 3 is a block diagram of a conventional frequency sweep laser device. (1)...Laser source, (3)...Electro-optical element,
(5)...power amplifier, (6)...oscillator, (7)...
Insulating oil, (10)...Case. In each figure, the same reference numerals indicate the same or corresponding parts.
Claims (1)
ーザ光を通過させる電気光学素子と、この電気光学素子
内の電界を制御する電力増幅器と、この電力増幅器に制
御信号を入力する発振器とを備えた周波数掃引レーザ装
置において、前記光学素子の周囲を覆う絶縁油を備えて
なることを特徴とする周波数掃引レーザ装置。The device includes a laser generation source, an electro-optical element that passes the laser light emitted from the laser generation source, a power amplifier that controls the electric field within the electro-optic element, and an oscillator that inputs a control signal to the power amplifier. 1. A frequency swept laser device characterized in that the frequency swept laser device comprises an insulating oil that covers the periphery of the optical element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32118190A JPH04192583A (en) | 1990-11-27 | 1990-11-27 | Frequency-sweep laser apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32118190A JPH04192583A (en) | 1990-11-27 | 1990-11-27 | Frequency-sweep laser apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04192583A true JPH04192583A (en) | 1992-07-10 |
Family
ID=18129697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32118190A Pending JPH04192583A (en) | 1990-11-27 | 1990-11-27 | Frequency-sweep laser apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04192583A (en) |
-
1990
- 1990-11-27 JP JP32118190A patent/JPH04192583A/en active Pending
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