US4744088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor laser array with focused emission
Assignee: Siemens AG
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Filing: 1987-03-13
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Granted: 1988-05-10
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Expires: 2007-03-13
Abstract
Abstract A semiconductor laser array having laser active strips optically coupled to one another, wherein only every second laser active strip emits laser energy so that one main emission lobe appears.
Inventors
- 👤 Jochen Heinen
- 👤 Christian Hanke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:02
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/12; H01S5/125; H01S5/40; H01S5/4025; H01S5/4031; H01S5/4087
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
94 words
An improved semiconductor laser array in a semiconductor body, the improvement comprising: a sequence of laser active strips for generating laser emissions disposed next to one another; means provided at every second one of said laser active strips in said sequence of laser active strips for preventing emission of the laser radiation by reflection, said emission preventing means being provided in the region of an end face of said semiconductor body so that the laser emission from said laser array is only a single emission lobe from said end face of said semiconductor body.
Claim 2
Dependent Claim
94 words
An improved semiconductor laser array in a semiconductor body, the improvement comprising: a sequence of laser active strips for generating laser emissions disposed next to one another; means provided at every second one of said laser active strips in said sequence of laser active strips for preventing emission of the laser radiation by reflection, said emission preventing means being provided in the region of an end face of said semiconductor body so that the laser emission from said laser array is only a single emission lobe from said end face of said semiconductor body.
Claim 3
Dependent Claim
40 words
A semiconductor laser array as claimed in claim 1, wherein said reflecting means for preventing laser emission is a mirroring at said end face of said semiconductor body in the region of said second ones of said laser active strips.
Claim 4
Dependent Claim
51 words
A semiconductor laser array as claimed in claim 1, wherein said reflecting means for preventing emission is a reflecting surface spaced from said end face of said semiconductor body and formed extending into a material of said semiconductor body in the region of said second ones of said laser active strips.
Claim 5
Dependent Claim
24 words
A semiconductor laser array as claimed in claim 3, wherein said reflecting surface is a sidewall of a trench formed in said semiconductor body.
Claim 6
Dependent Claim
26 words
A semiconductor laser array as claimed in claim 1, wherein said reflecting means is a Bragg reflector for said second ones of said laser active strips.
Claim 7
Dependent Claim
67 words
An improved semiconductor laser array formed in a semiconductor body, the improvement comprising: alternate first and second laser active strips disposed parallel and adjacent one another for mutual optical coupling, said first laser active strips emitting a laser radiation from an end face of said semiconductor body, means for preventing said second laser active strips from emitting laser radiation from said end face of said semiconductor body.
Claim 8
Dependent Claim
67 words
An improved semiconductor laser array formed in a semiconductor body, the improvement comprising: alternate first and second laser active strips disposed parallel and adjacent one another for mutual optical coupling, said first laser active strips emitting a laser radiation from an end face of said semiconductor body, means for preventing said second laser active strips from emitting laser radiation from said end face of said semiconductor body.
Claim 9
Dependent Claim
33 words
A semiconductor laser array as claimed in claim 6, further comprising: means for reflecting laser radiation provided adjacent said end face of said semiconductor body at each of said second laser active strips.
Claim 10
Dependent Claim
24 words
A semiconductor laser array as claimed in claim 7, wherein said reflecting means at each of said second laser active strips is a mirror.
Claim 11
Dependent Claim
26 words
A semiconductor laser array as claimed in claim 7, wherein said reflecting means is a distributed reflector applied to each of said second laser active strips.
Claim 12
Dependent Claim
29 words
A semiconductor laser array as claimed in claim 6, wherein at least one of said first laser active strips is of at least two different structures along its length.
Claim 13
Dependent Claim
46 words
A semiconductor laser array as claimed in claim 10, wherein said at least one first laser active strip is an oxide strip laser for a first part of its length and is a metal clad ridge waveguide for at least a second part of its length.
Claim 14
Dependent Claim
28 words
A semiconductor laser array as claimed in claim 10, wherein each of said first laser active strips is of at least two different structures along their respective lengths.
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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) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |