US3657735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam excited laser
Assignee: RCA Corp
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Filing: 1970-03-20
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Granted: 1972-04-18
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Expires: 1990-03-20
Abstract
Abstract An electron beam excited laser element including a body of a material which is capable of generating light when excited by an electron beam and having a pair of opposed, substantially parallel, spaced surfaces. A partially reflective layer is provided on one surface of the body to allow emission of a portion of the light from the body. A metal layer is provided over the other surface of the body with at least a portion of the metal layer being spaced from the surface of the body. The metal layer is substantially fully light reflective but transmits the electrons of the electron beam with little loss. When an electron beam is directed at the spaced portion of the metal film, the material of the body is excited to generate light which is emitted through the partially reflective layer. The spacing of the metal layer from the surface of the body reduces the electron beam power necessary to cause lasing of the element.
Inventors
- 👤 Frederick Hermes Nicoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:28
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/0955; H01S3/0959
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
An electron beam excited laser comprising a. a body of a semiconductor laser material which will generate light when excited by an electron beam, b. a light reflective, electron permeable layer of an electrically conductive metal covering a surface of the body, said metal layer being of a thickness so as to substantially fully reflect the light generated in the body but transmit the exciting electrons, and at least a portion of said metal layer being spaced from said surface the space between the metal layer and the said surface of the body being permeable with respect to the exciting electrons so that the exciting electrons can reach said body, and c. means for applying a beam of electrons to at least the portion of said metal layer which is spaced from said body so that said electrons pass through said metal layer and said space to said body to provide enhanced operation of said laser.
Claim 2
Dependent Claim
156 words
An electron beam excited laser comprising a. a body of a semiconductor laser material which will generate light when excited by an electron beam, b. a light reflective, electron permeable layer of an electrically conductive metal covering a surface of the body, said metal layer being of a thickness so as to substantially fully reflect the light generated in the body but transmit the exciting electrons, and at least a portion of said metal layer being spaced from said surface the space between the metal layer and the said surface of the body being permeable with respect to the exciting electrons so that the exciting electrons can reach said body, and c. means for applying a beam of electrons to at least the portion of said metal layer which is spaced from said body so that said electrons pass through said metal layer and said space to said body to provide enhanced operation of said laser.
Claim 3
Dependent Claim
39 words
A laser in accordance with claim 1 in which the metal layer is coated on said surface of the body and has a bubble therein to space a portion of the metal layer from said surface of the body.
Claim 4
Dependent Claim
34 words
A laser in accordance with claim 2 in which the metal layer has a plurality of spaced bubbles therein to provide a plurality of regions which are spaced from said surface of the body.
Claim 5
Dependent Claim
34 words
A laser in accordance with claim 1 including means between the said surface of the body and the metal layer spacing the entire area of the metal film from said surface of the body.
Claim 6
Dependent Claim
43 words
A laser in accordance with claim 4 in which the means spacing the metal layer from said surface of the body is a layer of a dielectric material on said surface of the body and the metal layer is on the dielectric layer.
Claim 7
Dependent Claim
46 words
A laser in accordance with claim 4 in which the means spacing the metal layer from said surface is a plurality of spaced pedestals on said surface of the body and the metal film extends over said surface of the body and is on the pedestals.
Claim 8
Dependent Claim
37 words
A laser in accordance with claim 1 in which the distance between the spaced portion of the metal film and said surface of the body is approximately one-fourth the wavelength of the light generated by the body.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |