JP2792312B2 - Gas laser tube - Google Patents
Gas laser tubeInfo
- Publication number
- JP2792312B2 JP2792312B2 JP4649992A JP4649992A JP2792312B2 JP 2792312 B2 JP2792312 B2 JP 2792312B2 JP 4649992 A JP4649992 A JP 4649992A JP 4649992 A JP4649992 A JP 4649992A JP 2792312 B2 JP2792312 B2 JP 2792312B2
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- gas laser
- laser tube
- tube
- envelope
- 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.)
- Expired - Lifetime
Links
Landscapes
- Lasers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はガスレーザ管に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas laser tube.
【０００２】[0002]
【従来の技術】従来のガスレーザ管は、図３に示すよう
に、細管４に接続した外囲器１内にらせん状のカソード
２を備え、細管端部にアノード３を備え、さらに、細管
４と外囲器１とを挾んで出力ミラー５と全反射ミラー６
を備えている。このガスレーザ管は、外囲器１に閉じ込
められた気体を、カソード２とアノード３の管にある細
管４の部分で放電によって励起させ、励起によって得ら
れた光を全反射ミラー５と、出力ミラー６の間で共振さ
せてレーザ光７を出力するようになっている。このとき
熱電子を放出させるためにカソード２には約１０Ａの交
流電流を流す。また、レーザ光がカソード２の中心を通
るようにするために、カソード２の形状はらせん状とな
っている。2. Description of the Related Art As shown in FIG. 3, a conventional gas laser tube includes a spiral cathode 2 in an envelope 1 connected to a thin tube 4, an anode 3 at the end of the thin tube, and a thin tube 4 as shown in FIG. Output mirror 5 and total reflection mirror 6 sandwiching
It has. This gas laser tube excites the gas confined in the envelope 1 by discharge in a portion of the thin tube 4 in the tube of the cathode 2 and the anode 3, and the light obtained by the excitation is a total reflection mirror 5 and an output mirror. The laser beam 7 is output by resonating between the laser beams 6. At this time, an alternating current of about 10 A flows through the cathode 2 to emit thermoelectrons. The shape of the cathode 2 is helical so that the laser light passes through the center of the cathode 2.
【０００３】[0003]
【発明が解決しようとする課題】この従来のガスレーザ
管では、らせん状のカソードに交流電流を流すために磁
場が発生し、細管内部のプラズマの状態を一定に保つこ
とが困難であった。このためレーザ光出力にカソードへ
の入力交流電流と同じ周波数のノイズが乗ってしまうと
いう問題があった。In this conventional gas laser tube, a magnetic field is generated because an alternating current flows through the spiral cathode, and it is difficult to keep the state of plasma inside the thin tube constant. For this reason, there is a problem that noise having the same frequency as the input alternating current to the cathode is superimposed on the laser light output.
【０００４】[0004]
【課題を解決するための手段】本発明のレーザ管は、レ
ーザ光の方向に対して左まわりの部分と右まわりの部分
を持つらせん構造をしたカソードを備えている。SUMMARY OF THE INVENTION A laser tube according to the present invention includes a cathode having a spiral structure having a left-handed portion and a right-handed portion with respect to the direction of laser light.
【０００５】[0005]
【実施例】次に本発明について図面を参照して説明す
る。図１は本発明の一実施例のレーザ管の一部（外囲器
部分）の断面図である。カソードは左回りらせん部８と
右回りらせん部９とが直列接続した構造になっている。
この他は従来と同じである。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a part (envelope part) of a laser tube according to an embodiment of the present invention. The cathode has a structure in which a left-handed spiral portion 8 and a right-handed spiral portion 9 are connected in series.
Others are the same as the conventional one.
【０００６】第２の実施例は、図２のように、２つの同
じらせんのカソード２ａ，２ｂを互いに反対向きに並列
に取付け、レーザ光７の方向に対して２つのカソード２
ａ，２ｂに流れる電流が常に互いに逆回りとなる構造で
ある。この他は従来と同じである。In the second embodiment, as shown in FIG. 2, two cathodes 2a and 2b of the same spiral are attached in parallel in opposite directions to each other,
This is a structure in which currents flowing through a and 2b are always opposite to each other. Others are the same as the conventional one.
【０００７】なお、上記いずれの実施例も、カソードは
右回りらせん部と左回りらせん部が光軸方向に並んだ構
造であったが、一方のらせん部（例えば右回りらせん
部）の外側に、そのらせん部を取り囲んで他方のらせん
部（例えば左回りらせん部）を設けた二重構造、あるい
は、２本の導線を平行にしてらせん状に巻いたらせん状
２本巻構造とし、この２本の各々に流れる電流で発生す
る磁場が互いに打ち消すように接続した構造でもよい。
要は、カソードに電流を流したときに、この電流によっ
て磁場が実効的に発生しない構造であればよい。したが
ってらせん構造以外の構造、例えば蛇行状のカソードを
レーザ光の光路からはずれた位置に設けてもよい。In each of the above embodiments, the cathode has a structure in which a right-handed helical portion and a left-handed helical portion are arranged in the optical axis direction. However, the cathode is provided outside one helical portion (for example, a right-handed helical portion). A helical portion surrounding the helical portion and a second helical portion (e.g., a left-handed helical portion), or a helical two-winding structure in which two conductors are wound in parallel and spirally. A structure in which magnetic fields generated by currents flowing through each book are connected so as to cancel each other may be used.
In short, any structure may be used as long as a current does not effectively generate a magnetic field when a current flows through the cathode. Therefore, a structure other than the spiral structure, for example, a meandering cathode may be provided at a position off the optical path of the laser beam.
【０００８】[0008]
【発明の効果】以上説明したように本発明は、ガスレー
ザ管においてカソードの形状をカソードの中心部での磁
場の発生を防ぐ構造としたことにより、細管内のプラズ
マの状態を一定に保つことができ、レーザ高出力のノイ
ズを低減するという結果を有する。As described above, according to the present invention, the state of the plasma in the thin tube can be kept constant by making the shape of the cathode in the gas laser tube so as to prevent the generation of a magnetic field at the center of the cathode. This has the result of reducing high power laser noise.
【図１】本発明の一実施例を示すガスレーザ管の一部の
断面図。FIG. 1 is a sectional view of a part of a gas laser tube showing one embodiment of the present invention.
【図２】本発明の第２の実施例を示すガスレーザ管の一
部の断面図。FIG. 2 is a sectional view of a part of a gas laser tube according to a second embodiment of the present invention.
【図３】従来技術によるガスレーザ管の断面図。FIG. 3 is a sectional view of a conventional gas laser tube.
１ 外囲器 ２ カソード ３ アノード ４ 細管 ５ 出力ミラー ６ 全反射ミラー ７ レーザ光 ８ カソード（左回りらせん部） ９ カソード（右回りらせん部） Reference Signs List 1 envelope 2 cathode 3 anode 4 thin tube 5 output mirror 6 total reflection mirror 7 laser beam 8 cathode (left-handed spiral) 9 cathode (right-handed spiral)
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H01S 3/038──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) H01S 3/038
Claims (1)
備え、外囲器の一端に出力ミラー、外囲器の他端に全反
射ミラーを有するガスレーザ管において、前記カソード
はらせんの形状をし、このらせんの形状は前記カソード
に電流を流したときにこのらせんの中心を通るレーザ光
の方向に対して、電流が左まわりに流れる部分と右まわ
りに流れる部分の両方の部分を持つことを特徴とするガ
スレーザ管。1. A gas laser tube having a thin tube, a cathode, and an anode inside an envelope, an output mirror at one end of the envelope, and a total reflection mirror at the other end of the envelope, wherein the cathode has a spiral shape. However, the shape of the helix has both a portion where the current flows counterclockwise and a portion where the current flows clockwise with respect to the direction of the laser beam passing through the center of the helix when the current flows through the cathode. A gas laser tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4649992A JP2792312B2 (en) | 1992-03-04 | 1992-03-04 | Gas laser tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4649992A JP2792312B2 (en) | 1992-03-04 | 1992-03-04 | Gas laser tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05251793A JPH05251793A (en) | 1993-09-28 |
| JP2792312B2 true JP2792312B2 (en) | 1998-09-03 |
Family
ID=12748935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4649992A Expired - Lifetime JP2792312B2 (en) | 1992-03-04 | 1992-03-04 | Gas laser tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2792312B2 (en) |
-
1992
- 1992-03-04 JP JP4649992A patent/JP2792312B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05251793A (en) | 1993-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980519 |