US3660776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mirror means for laser structures
Assignee: Panasonic Holdings Corp
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Filing: 1970-06-22
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Granted: 1972-05-02
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Expires: 1990-06-22
Abstract
Abstract A mirror means used in a gas laser structure for permitting an infra-red laser beam to pass therethrough comprising a substrate plate made of an infra-red transparent material and secured airtightly to the one end of the laser tube, the central portion of the substrate plate being made thinner than the remaining portion and sized substantially larger than the sectional area of the output laser beam, and a reflective metal film coated on the inner surface of the remaining portion. The mirror means is free from being destroyed by a high temperature increase and has a light absorption reduced to a minimum at the central recessed portion, thus providing an utmost high output power.
Inventors
- 👤 Eiso Yamaka
- 👤 Norio Karube
- 👤 Masakazu Akiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:21
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/034
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
In a gas laser structure with an evacuated laser tube the improvement comprising a plane mirror secured air-tightly to one end of said laser tube, said mirror disposed perpendicular to the axis of the laser tube and having a substrate plate made of an infra-red transparent material coated with a reflective metal film on its inner surface, said film coating the inner surface of said substrate plate except for a central portion thereof, said central portion sized substantially larger than a sectional area of the output laser beam and having a thickness smaller than that of the remaining portion of said substrate plate, the thickness of said central portion is such that the generation of free carriers is minimized therein and the mechanical strength is sufficient to withstand the warping force resulting from the difference between the ambient pressure and the vacuum prevailing in the tube.
Claim 2
Dependent Claim
146 words
In a gas laser structure with an evacuated laser tube the improvement comprising a plane mirror secured air-tightly to one end of said laser tube, said mirror disposed perpendicular to the axis of the laser tube and having a substrate plate made of an infra-red transparent material coated with a reflective metal film on its inner surface, said film coating the inner surface of said substrate plate except for a central portion thereof, said central portion sized substantially larger than a sectional area of the output laser beam and having a thickness smaller than that of the remaining portion of said substrate plate, the thickness of said central portion is such that the generation of free carriers is minimized therein and the mechanical strength is sufficient to withstand the warping force resulting from the difference between the ambient pressure and the vacuum prevailing in the tube.
Claim 3
Dependent Claim
26 words
A mirror means according to claim 1, wherein said infra-red transparent material is selected from the semiconductor group consisting of germanium, Irtran, silicon and gallium arsenide.
Claim 4
Dependent Claim
23 words
A mirror means according to claim 1, wherein said reflective metal film is selected from the group consisting of gold, silver and aluminum.
Claim 5
Dependent Claim
21 words
A mirror means according to claim 1, further comprising an anti-reflection film coated on the inner surface of said central portion.
References Cited (Backward Citations)
US3493892A
Cited
FR1548639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |