Patent US4878223A successfully refreshed from Google Patents.
US4878223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor laser array device
Assignee: Sharp Corp
•
Filing: 1988-07-26
•
Granted: 1989-10-31
•
Expires: 2008-07-26
Abstract
Abstract A semiconductor laser array device comprising a substrate with a plurality of grooves and an active layer disposed over the substrate, resulting in optical waveguides within the active layer corresponding to the grooves, wherein the grooves are disposed over the entire area of the substrate and a means for preventing the injection of current into some of the grooves that are positioned outside of the central area of the substrate is disposed whereby the other grooves positioned in the central area of the substrate constitute a laser array portion of the semiconductor laser array device.
Inventors
- 👤 Taiji Morimoto
- 👤 Hiroyuki Hosoba
- 👤 Mitsuhiro Matsumoto
- 👤 Mototaka Taneya
- 👤 Sadayoshi Matsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:36
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/40; H01S5/4025; H01S5/4031; H01S5/20; H01S5/22; H01S5/223; H01S5/2232; H01S5/2234
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
In a semiconductor laser array device comprising a substrate with a plurality of first grooves with a given pitch, and a current blocking layer with a conductivity type that is different from that of said substrate and that is disposed on the groove-side surface of said substrate, an improved structure wherein: said current blocking layer has a plurality of second grooves on its crystal growth surface that is opposite to the groove-side surface of said substrate; a heterostructure multi-layered crystal is disposed on said current blocking layer, said multi-layered crystal having an active layer for laser oscillation; and the position of each of the first grooves is shifted half a pitch from that of each of the second grooves in a central area elongated substantially along the laser oscillation direction, and wherein each of the first grooves is positioned over each of the second grooves in side areas, said second grooves reaching said substrate through said current blocking layer in said central area, which results in current paths.
Claim 2
Dependent Claim
168 words
In a semiconductor laser array device comprising a substrate with a plurality of first grooves with a given pitch, and a current blocking layer with a conductivity type that is different from that of said substrate and that is disposed on the groove-side surface of said substrate, an improved structure wherein: said current blocking layer has a plurality of second grooves on its crystal growth surface that is opposite to the groove-side surface of said substrate; a heterostructure multi-layered crystal is disposed on said current blocking layer, said multi-layered crystal having an active layer for laser oscillation; and the position of each of the first grooves is shifted half a pitch from that of each of the second grooves in a central area elongated substantially along the laser oscillation direction, and wherein each of the first grooves is positioned over each of the second grooves in side areas, said second grooves reaching said substrate through said current blocking layer in said central area, which results in current paths.
Claim 3
Dependent Claim
39 words
A semiconductor laser array device according to claim 1, wherein the position of each of the first grooves in said central area is shifted half a pitch from that of each of the first grooves in said side areas.
Claim 4
Dependent Claim
39 words
A semiconductor laser array device according to claim 1, wherein the position of each of the second grooves in said central area is shifted half a pitch from that of each of the second grooves in said side areas.
References Cited (Backward Citations)
US4751709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |