US4872179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser apparatus with a multipass resonator
Assignee: WC HERAEUS HERAEUSSTRASSE 12-14 D-6450 HANAU 1 FEDERAL REPUBLIC OF GERMANY A CORP OF GERMAN GmbH
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Filing: 1988-12-13
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Granted: 1989-10-03
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Expires: 2008-12-13
Abstract
Abstract A laser device includes a multipass resonator which has, in the beam path between two resonator end mirrors, at least two opposite beam folding mirrors with confronting mirror surfaces. At least one of the beam folding mirrors is limited in its width and at least one has a beam discharge area. To produce a low-order laser mode, preferably a 00 mode, the mirror surface of at least one beam folding mirror has its reflectivity dimishished in the region outside of the desired modes of radiation.
Inventors
- 👤 Rainer Nitsche
- 👤 Bruno Sebralla
- 👤 Rolf Malkmus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:35
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/081
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
In a laser apparatus with a multipass resonator, which has in the beam path between two resonator end mirrors at least two oppositely lying beam folding mirrors with mirror surfaces facing one another, of which at least one is limited in its width and at least one has a beam discharge area, the improvement wherein the mirror surface of at least one of the beam folding mirrors is reduced in its reflectivity in the region outside of desired modes of radiation thereby to mask out undesired modes of radiation.
Claim 2
Dependent Claim
89 words
In a laser apparatus with a multipass resonator, which has in the beam path between two resonator end mirrors at least two oppositely lying beam folding mirrors with mirror surfaces facing one another, of which at least one is limited in its width and at least one has a beam discharge area, the improvement wherein the mirror surface of at least one of the beam folding mirrors is reduced in its reflectivity in the region outside of desired modes of radiation thereby to mask out undesired modes of radiation.
Claim 3
Dependent Claim
18 words
The laser apparatus according to claim 1, wherein the areas of diminished reflectivity are formed by roughened surfaces.
Claim 4
Dependent Claim
18 words
The laser apparatus according to claim 1, wherein the areas of diminished reflectivity are formed by reflection-reducing coatings.
Claim 5
Dependent Claim
20 words
The laser apparatus according to claim 1, wherein the areas of diminished reflectivity are formed by a plurality of holes.
Claim 6
Dependent Claim
13 words
The laser apparatus according to claim 4, wherein the holes are blind holes.
Claim 7
Dependent Claim
28 words
The laser apparatus according to claim 1, wherein the mirror area of at least one beam folding mirror is composed of a plurality of substantially circular mirror areas.
References Cited (Backward Citations)
US3904983A
Cited
US3824488A
Cited
DE3515679C1
Cited
US4686685A
Cited
JPS6276580A
Cited
US4703491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |