Patent US5235608A successfully refreshed from Google Patents.
US5235608A
Expired / Lapsed
US
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Gas laser apparatus
Assignee: NEC Microwave Tube Ltd
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Filing: 1992-09-28
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Granted: 1993-08-10
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Expires: 2012-09-28
Abstract
Abstract In a gas laser apparatus including a gas laser tube having a plasma tube between a cathode electrode and an anode electrode, and a magnetic field generator for generating a magnetic field through the central hole of said plasma tube, the radius of the central hole is configured so as to avoid ion bombardment by confining the ionized plasma within the magnetic flux passing through the cathode electrode. For practical purposes the central hole is tapered, at least near the entrance thereof, with its radius larger than that of the magnetic flux entering the central hole, thereby substantially eliminating sputtering by ion plasma at the entrance end and on the inner wall of the plasma tube.
Inventors
- 👤 Takayoshi Konishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:59
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/032; H01S3/0326
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A gas laser apparatus including a gas laser tube having a plasma tube between a cathode electrode and an anode electrode, and a magnetic field generator for generating a magnetic field through the central hole of said plasma tube, wherein the radius of said central hole at any given point along the center line of said central hole is greater than the radius R of magnetic flux B, defined by ##EQU4## where Rc is the radius of a circle circumscribing the cathode end opposing said plasma tube, Bc is the magnetic flux at the center of said circumcircle, and B is the magnetic flux density at said given axial point.
Claim 2
Dependent Claim
110 words
A gas laser apparatus including a gas laser tube having a plasma tube between a cathode electrode and an anode electrode, and a magnetic field generator for generating a magnetic field through the central hole of said plasma tube, wherein the radius of said central hole at any given point along the center line of said central hole is greater than the radius R of magnetic flux B, defined by ##EQU4## where Rc is the radius of a circle circumscribing the cathode end opposing said plasma tube, Bc is the magnetic flux at the center of said circumcircle, and B is the magnetic flux density at said given axial point.
Claim 3
Dependent Claim
27 words
A gas laser apparatus according to claim 1, wherein said capillary tube is divided into a multiplicity of pieces coaxially spaced apart along their common center line.
Claim 4
Dependent Claim
109 words
A gas laser apparatus including a gas laser tube having a plasma tube between a cathode electrode and an anode electrode, and a magnetic field generator for generating a magnetic field through a central hole of said plasma tube, wherein the radius of the entrance of said central hole facing said cathode electrode is larger than the radius R of magnetic flux density B, defined by ##EQU5## where Rc is the radius of a circle circumscribing the cathode end opposing said plasma tube, Bc is the magnetic flux density at the center of said circle, and B is the magnetic flux density at said entrance of said central hole.
Claim 5
Dependent Claim
109 words
A gas laser apparatus including a gas laser tube having a plasma tube between a cathode electrode and an anode electrode, and a magnetic field generator for generating a magnetic field through a central hole of said plasma tube, wherein the radius of the entrance of said central hole facing said cathode electrode is larger than the radius R of magnetic flux density B, defined by ##EQU5## where Rc is the radius of a circle circumscribing the cathode end opposing said plasma tube, Bc is the magnetic flux density at the center of said circle, and B is the magnetic flux density at said entrance of said central hole.
Claim 6
Dependent Claim
27 words
A gas laser apparatus according to claim 3, wherein said plasma tube is divided into a multiplicity of pieces coaxially spaced apart along their common center line.
References Cited (Backward Citations)
US3993965A
Cited
US4912719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |