Patent US3845409A successfully refreshed from Google Patents.
US3845409A
Expired / Lapsed
US
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Laser grating couplers
Assignee: United States Department of the Air Force
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Filing: 1973-11-27
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Granted: 1974-10-29
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Expires: 1993-11-27
Abstract
Abstract Gratings are utilized as couplers and reflectors in which the components are exposed to high speed gas flow.
Inventors
- 👤 J Wada
- 👤 G Janney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:34
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/42; G02B27/4272; G02B27/4277; H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/08004; H01S3/08009; H01S3/09; H01S3/097; H01S3/0979
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
235 words
Grating reflectors for optical systems exposed to high speed gas flow comprising a channel, said channel having first and second walls opposite to each other, each wall having an inner surface, a gas medium flowing at high speed within said channel, an opening in said first channel wall, a first grating reflector having an inner surface, said grating reflector pressure fitted into said second channel wall with the inner surface thereof flush with said inner surface of said second channel wall, said grating reflector being directly opposite to said opening in said first channel wall, a second grating reflector also having an inner surface, said second reflector being pressure fitted in said first channel wall to permit the inner surface thereof to be flush with the inner surface of said first channel wall, said second grating reflector being positioned at a predetermined distance from said opening, a mirror having an inner surface, said mirror pressure fitted into said second channel wall and having the inner surface thereof flush with said inner surface of said second channel wall, said mirror being directly opposite to said second grating reflector, and a laser beam directed through said opening to said first grating reflector, said first grating reflector directing said laser beam at a preselected angle to said second grating reflector, said second grating reflector directing said laser beam through said mirror to provide an output laser beam therefrom.
Claim 2
Dependent Claim
235 words
Grating reflectors for optical systems exposed to high speed gas flow comprising a channel, said channel having first and second walls opposite to each other, each wall having an inner surface, a gas medium flowing at high speed within said channel, an opening in said first channel wall, a first grating reflector having an inner surface, said grating reflector pressure fitted into said second channel wall with the inner surface thereof flush with said inner surface of said second channel wall, said grating reflector being directly opposite to said opening in said first channel wall, a second grating reflector also having an inner surface, said second reflector being pressure fitted in said first channel wall to permit the inner surface thereof to be flush with the inner surface of said first channel wall, said second grating reflector being positioned at a predetermined distance from said opening, a mirror having an inner surface, said mirror pressure fitted into said second channel wall and having the inner surface thereof flush with said inner surface of said second channel wall, said mirror being directly opposite to said second grating reflector, and a laser beam directed through said opening to said first grating reflector, said first grating reflector directing said laser beam at a preselected angle to said second grating reflector, said second grating reflector directing said laser beam through said mirror to provide an output laser beam therefrom.
Claim 3
Dependent Claim
29 words
Grating reflectors for optical systems as described in claim 1 wherein said first and second grating reflectors include first and second grating surfaces respectively, in accordance with beam angle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |