US3747018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Platelet semiconductive laser
Assignee: 3M Co
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Filing: 1972-03-16
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Granted: 1973-07-17
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Expires: 1992-03-16
Abstract
Abstract A laser device comprising a naturally grown single crystal semiconductor platelet having a power conversion efficiency of at least 10 2 percent and a means for producing and impinging upon the crystal a beam of electrons of energy less than 75 KeV.
Inventors
- 👤 J Packard
- 👤 G Dierssen
- 👤 W Tait
- 👤 D Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:17
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/0955; H01S3/0959
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
45 words
The device of claim 1 wherein said major faces of said naturally grown single crystal are planar, parallel and optically smooth and wherein said platelet is cleaved to form two spaced reflective edges which are perpendicular to said major faces to form a resonant cavity.
Claim 2
Dependent Claim
93 words
An electron beam pumped laser, comprising: means for producing and directing an electron beam of a predetermined voltage and current density along a predetermined path; and a high purity cadmium selenide single crystal platelet of low surface strain having at least two spaced parallel reflective edges to form a resonant cavity and being disposed in said path to be bombarded by said electron beam, said cadmium selenide platelet being responsive to bombardment by said electron beam to produce visible light by stimulated emission which light emanates from said cavity through said reflective edges.
Claim 3
Dependent Claim
19 words
The electron beam pumped laser of claim 3 further including means for varying the ambient temperature of said platelet.
Claim 4
Dependent Claim
37 words
The electron beam pumped laser of claim 3 further including means operatively coupled to said electron beam producing means for modulating said electron beam to produce a series of pulses for exciting said platelet into stimulated emission.
Claim 5
Dependent Claim
121 words
A cadmium selenide laser for producing coherent stimulated emission in the visible spectrum, comprising: a high purity cadmium selenide platelet of low surface strain formed into a Fabry-Perot cavity and having a c-axis which is parallel to the reflective edges of said platelet forming said cavity; and means for exciting said platelet with a series of electron beam pulses having sufficient voltage and current density to excite said platelet into mode oscillations, said electron beam being directed along a predetermined path to bombard said platelet perpendicular to said c-axis and the major faces of the platelet to produce electromagnetic radiation exhibiting temporally and spatially coherent emission wherein the emission spectrum comprises a series of spaced emission lines corresponding to cavity modes.
Claim 6
Dependent Claim
100 words
An electron beam pumped laser, comprising: means for producing and directing an electron beam of a predetermined voltage and current density along a predetermined path; and a high purity single crystal semiconductor platelet of low surface strain having a power conversion efficiency in excess of 10 2 percent, having at least two spaced reflective edges to form a resonant cavity and being disposed in said path to be bombarded by said electron beam, said platelet being responsive to bombardment by said electron beam to produce electromagnetic radiation by stimulated emission which light emanates from said cavity through said reflective edges.
Claim 7
Independent Claim
91 words
A device for producing electromagnetic radiation by stimulated emission comprising: a naturally grown single crystal platelet of a semiconductor having a power conversion efficiency in excess of 10 2 percent and capable of stimulated emission when excited by a source of energy having a predetermined incident intensity, said platelet when excited into stimulated emission producing electromagnetic radiation which exhibits both line narrowing and superlinear dependence on said incident intensity, and means for bombarding said platelet with energy having at least said predetermined incident intensity to excite said platelet into stimulated emission.
Claim 8
Dependent Claim
20 words
The device of claim 8 wherein said platelet has at least two spaced reflective edges to form a resonant cavity.
Claim 9
Dependent Claim
31 words
The device of claim 9 wherein said platelet has a pair of spaced optically smooth faces and wherein said means for bombarding said platelet bombards one of said optically smooth faces.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |