US3605037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curved junction laser devices
Assignee: AT&T Inc
•
Filing: 1969-05-02
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Granted: 1971-09-14
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Expires: 1989-05-02
Abstract
Abstract The specification describes an injection-type laser device in which the junction is formed in a curved configuration to form a ring or semiring shaped cavity. The radius of curvature of the ring must exceed a critical minimum for sustained laser oscillations.
Inventors
- 👤 Lucian A D Asaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:47
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/81; H10H20/819; H10H20/821; H01; H01S; H01S5/00; H01S5/10; H01S5/1071
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
An injection-type laser in which the dominant oscillating mode propagates in a curved path such that two coherent output beams are produced emerging from the laser within an angle of 30* of one another, the laser comprising a semiconductor body having a first region of one conductivity type and a second region of the opposite conductivity type formed into one surface of said first region to form a diode, the second region having the approximate shape of an incomplete toroid of a semicircle with both ends terminating at an edge bounding said first region so that the cross section of the second region is exposed at the edge or edges bounding the first region, the radius of the aforesaid toroid rotated through an angle in the range of 150* to 210* and having a length in the range of 0.4 mm. to 40 mm. and means for forward biasing the diode so as to produce two coherent light beams radiating within 30* of the same direction.
Claim 2
Dependent Claim
166 words
An injection-type laser in which the dominant oscillating mode propagates in a curved path such that two coherent output beams are produced emerging from the laser within an angle of 30* of one another, the laser comprising a semiconductor body having a first region of one conductivity type and a second region of the opposite conductivity type formed into one surface of said first region to form a diode, the second region having the approximate shape of an incomplete toroid of a semicircle with both ends terminating at an edge bounding said first region so that the cross section of the second region is exposed at the edge or edges bounding the first region, the radius of the aforesaid toroid rotated through an angle in the range of 150* to 210* and having a length in the range of 0.4 mm. to 40 mm. and means for forward biasing the diode so as to produce two coherent light beams radiating within 30* of the same direction.
Claim 3
Dependent Claim
21 words
The laser of claim 1 wherein the angle of rotation is 180* so that the two coherent light beams are parallel.
Claim 4
Dependent Claim
11 words
The laser of claim 1 wherein the diode comprises gallium arsenide.
Claim 5
Dependent Claim
19 words
The laser of claim 1 wherein the radius of curvature of the cross section is less than 0.4 mm.
Claim 6
Dependent Claim
27 words
The laser of claim 1 wherein the first region includes a planar surface of the semiconductor body and the second region is formed into the planar surface.
Claim 7
Dependent Claim
21 words
The laser of claim 1 wherein the second region is formed into a depression on the surface of the semiconductor body.
Claim 8
Dependent Claim
122 words
An injection-type laser in which the dominant oscillating mode propagates in a curved path such that two coherent output beams are produced emerging from the laser within an angle of 30* of one another, the laser comprising a semiconductor body having a first planar region of one conductivity type and a second region of the opposite conductivity type formed into one surface of said first region to form a diode, the second region having the approximate shape of a complete toroid of a semicircle, the radius of the aforesaid toroid having a length in the range of 0.4 mm. to 40 mm., and means for forward biasing the diode so as to produce a coherent light output radiating tangentially from the toroid.
Claim 9
Dependent Claim
122 words
An injection-type laser in which the dominant oscillating mode propagates in a curved path such that two coherent output beams are produced emerging from the laser within an angle of 30* of one another, the laser comprising a semiconductor body having a first planar region of one conductivity type and a second region of the opposite conductivity type formed into one surface of said first region to form a diode, the second region having the approximate shape of a complete toroid of a semicircle, the radius of the aforesaid toroid having a length in the range of 0.4 mm. to 40 mm., and means for forward biasing the diode so as to produce a coherent light output radiating tangentially from the toroid.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |