DE4007309A1 - Excimer laser discharge components - made of or coated with precious metals - Google Patents
Excimer laser discharge components - made of or coated with precious metalsInfo
- Publication number
- DE4007309A1 DE4007309A1 DE19904007309 DE4007309A DE4007309A1 DE 4007309 A1 DE4007309 A1 DE 4007309A1 DE 19904007309 DE19904007309 DE 19904007309 DE 4007309 A DE4007309 A DE 4007309A DE 4007309 A1 DE4007309 A1 DE 4007309A1
- Authority
- DE
- Germany
- Prior art keywords
- metals
- materials
- electrodes
- main discharge
- precious metals
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/038—Electrodes, e.g. special shape, configuration or composition
- H01S3/0388—Compositions, materials or coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/22—Gases
- H01S3/223—Gases the active gas being polyatomic, i.e. containing two or more atoms
- H01S3/225—Gases the active gas being polyatomic, i.e. containing two or more atoms comprising an excimer or exciplex
Abstract
Description
Excimer-Laser sind gepulste Glaslaser, deren aus Edelgasen und Halogen bestehendes Lasermedium über Hochspannungs entladungen angeregt wird. Bevor die Hauptentladung zwischen den Hauptentladungselektroden gezündet werden kann, muß im Lasermedium eine Dichte von ca. 107 cm-3 an freien Elektronen erzeugt werden. Dieser Stand der Technik wurde in zahlreichen Publikationen beschrieben; s. z. B. W. Mückenheim: Excimerlaser-Technologie in: Laser- Technologie und Anwendungen, H. Kohler (Hrsg.), Vulkan- Verlag, Essen 1988, S. 26 ff.Excimer lasers are pulsed glass lasers whose laser medium consisting of noble gases and halogen is excited by high-voltage discharges. Before the main discharge can be ignited between the main discharge electrodes, a density of approx. 10 7 cm -3 of free electrons must be generated in the laser medium. This state of the art has been described in numerous publications; sz BW Mückenheim: Excimer laser technology in: Laser technology and applications, H. Kohler (ed.), Vulkan-Verlag, Essen 1988, p. 26 ff.
Die Hauptentladungselektroden unterliegen aufgrund hoher Ströme und Spannungen einem starken Verschleiß. Dasselbe gilt für die in der Regel verwendeten Funken strecken längs der Hauptentladungselektroden, die das zur Erzeugung von freien Elektronen verwendete ultra violette Licht erzeugen. Da sich sowohl Hauptentladungs elektroden als auch Funkenstrecken im halogenartigen Lasermedium befinden, darf das dafür verwendete Material nicht nennenswert von Halogenangegriffen werden.The main discharge electrodes are subject to high Currents and voltages subject to heavy wear. The same applies to the sparks usually used stretch along the main discharge electrodes that the ultra used to generate free electrons generate violet light. Because both main discharge electrodes as well as spark gaps in the halogen-like Material, the material used for it not significantly attacked by halogen.
Besonders hohe Anforderungen sind an die häufig verwendeten Entladungselektroden für fluorhaltige Lasermedien zu stellen. Während für chlorhaltige Lasermedien sehr haltbare Materialien wie z. B. Wolfram-Legierungen einge setzt werden können, stehen aufgrund der Gasverträglich keit diese im Falle von fluorhaltigen Lasermedien nicht zur Verfügung, da rasch Fluorverbindungen gebildet und Elektroden wie Lasermedien zerstört werden. Stand der Technik für fluorhaltige Lasermedien sind die Elektroden materialien Nickel, Messing und Kupfer, die jedoch nach einigen 108 bis 109 Impulsen (je nach Betriebsweise) ausgewechselt werden müssen.Particularly high demands are made of the frequently used discharge electrodes for fluorine-containing laser media. While for chlorine-containing laser media very durable materials such. B. tungsten alloys can be used, because of the gas compatibility, these are not available in the case of fluorine-containing laser media, since fluorine compounds are quickly formed and electrodes such as laser media are destroyed. State of the art for fluorine-containing laser media are the electrode materials nickel, brass and copper, which, however, must be replaced after a few 10 8 to 10 9 pulses (depending on the mode of operation).
Die Erfindung beruht auf der Idee, daß Edelmetalle sowohl resistent gegen Fluor sind als auch gut Halt barkeit gegenüber elektrischen Entladungen aufweisen. Diese Idee wurde bisher nicht verfolgt, vermutlich weil die hohen Herstellungskosten den Einsatz von Edelmetallen als nicht rentabel erscheinen ließen. Indessen hat sich herausgestellt, daß Elektroden und Funkenstrecken, die aus Edelmetall oder Edelmetall legierungen bestehen oder mit solchen Materialien beschichtet sind, eine gegenüber den Standardmaterialien bis zu zehnfach erhöhte Lebensdauer aufweisen. Da beim Auswechseln der Elektroden von Excimerlasern sehr hohe Kosten entstehen, ergibt eine Wirtschaftlichkeits berechnung große Vorteile für den Einsatz der erfindungs mäßigen Materialien.The invention is based on the idea that precious metals are both resistant to fluorine and hold well availability of electrical discharges. This idea has not been pursued until now, probably because the high manufacturing cost of using Made precious metals appear unprofitable. However, it has been found that electrodes and Spark gaps made of precious metal or precious metal alloys or with such materials are coated, one compared to the standard materials have up to ten times the lifespan. Since at Replacing the electrodes of excimer lasers very much high costs arise, results in a profitability Calculation great advantages for the use of the invention moderate materials.
Die Materialien sind die Metalle der Platingruppe, vorzugsweise Platin selbst sowie Iridium und Palladium, außerdem die Metalle Gold und Silber sowie ihre Legierun gen miteinander, z. B. Platin-Iridium, Gold-Platin, Silber-Palladium.The materials are the platinum group metals, preferably platinum itself as well as iridium and palladium, also the metals gold and silver and their alloys conditions with each other, e.g. B. platinum-iridium, gold-platinum, Silver palladium.
Zur Erhöhung der Wirtschaftlichkeit sind statt massiver Hauptentladungselektroden und Funkenstrecken solche zu verwenden, auf die das Edelmetall aufgepreßt oder elektrolytisch oder in anderer Weise aufgebracht worden ist. Erfahrungsgemäß genügen für die Hauptent ladungselektroden Schichtdicken von 0,2 bis 0,5 mm, für die Funkenstrecken Schichtdicken von 1 bis 5 mm. Im letzteren Falle kann der Verbund mit dem Träger material auch auf verschiedene andere Weisen (z. B. durch Löten) geschehen.To increase the economy are held massive main discharge electrodes and spark gaps to use those on which the precious metal is pressed or applied electrolytically or in some other way has been. Experience has shown that the main ent is sufficient charge electrodes layer thicknesses of 0.2 to 0.5 mm, for the spark gaps layer thicknesses from 1 to 5 mm. In the latter case, the bond with the carrier material in various other ways (e.g. by soldering).
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19904007309 DE4007309A1 (en) | 1990-03-08 | 1990-03-08 | Excimer laser discharge components - made of or coated with precious metals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19904007309 DE4007309A1 (en) | 1990-03-08 | 1990-03-08 | Excimer laser discharge components - made of or coated with precious metals |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4007309A1 true DE4007309A1 (en) | 1990-10-25 |
Family
ID=6401688
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19904007309 Withdrawn DE4007309A1 (en) | 1990-03-08 | 1990-03-08 | Excimer laser discharge components - made of or coated with precious metals |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4007309A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0464841A2 (en) * | 1990-07-06 | 1992-01-08 | Mitsubishi Denki Kabushiki Kaisha | Excimer laser device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63204676A (en) * | 1987-02-20 | 1988-08-24 | Toshiba Corp | Highly repetitive excimer laser device |
-
1990
- 1990-03-08 DE DE19904007309 patent/DE4007309A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63204676A (en) * | 1987-02-20 | 1988-08-24 | Toshiba Corp | Highly repetitive excimer laser device |
Non-Patent Citations (1)
Title |
---|
Römpp Chemie Lexikon, 9. Aufl., Georg Thieme Verlag, 1990, S. 1069, 4158 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0464841A2 (en) * | 1990-07-06 | 1992-01-08 | Mitsubishi Denki Kabushiki Kaisha | Excimer laser device |
EP0464841A3 (en) * | 1990-07-06 | 1992-03-25 | Mitsubishi Denki Kabushiki Kaisha | Excimer laser device |
US5187716A (en) * | 1990-07-06 | 1993-02-16 | Mitsubishi Denki Kabushiki Kaisha | Excimer laser device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OAV | Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1 | ||
8127 | New person/name/address of the applicant |
Owner name: MUECKENHEIM, WOLFGANG, PROF. DR., 8903 BOBINGEN, D |
|
8110 | Request for examination paragraph 44 | ||
8139 | Disposal/non-payment of the annual fee |