US4658403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical element in semiconductor laser device having a diffraction grating and improved resonance characteristics
Assignee: Sharp Corp
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Filing: 1984-10-31
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Granted: 1987-04-14
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Expires: 2004-10-31
Abstract
Abstract The disclosure is directed to an improved semiconductor laser device which includes a first light deriving optical waveguide connected approximately perpendicularly to a light exit face at one side, a second light deriving optical waveguide connected approximately perpendicularly to another light exit face at the other side and having an optical axis different from that of the first light deriving optical waveguide, and a light emitting optical waveguide subjected to optical coupling with a periodical diffraction grating for optical resonance, and connected to end portions of the first and second light deriving optical waveguides within the semiconductor laser device.
Inventors
- 👤 Haruhisa Takiguchi
- 👤 Shinji Kaneiwa
- 👤 Sadayoshi Matsui
- 👤 Mototaka Taneya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:46
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/0675; H01S5/00; H01S5/10; H01S5/12; H01S5/1028; H01S5/1032; H01S5/20; H01S5/22; H01S5/227; H01S5/2275
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
187 words
An optical element in a semiconductor laser device comprising: a periodical diffraction grating; a light emitting waveguide, optically coupled with said periodical diffraction grating for optical resonance, said light emitting waveguide emitting light received from a active layer of said element, said light emitting waveguide being substantially disposed in a first plane; first and second light exit faces, each said exit face having an exit portion thereof; a first optical waveguide connected to said light emitting waveguide and providing a first transmission path for light emitted from said light emitting waveguide to said first light exit face, said first optical waveguide being substantially disposed in said first plane and intersecting said first light exit face; and a second optical waveguide connected to said light emitting waveguide and providing a transmission path for light emitted from said light emitting waveguide to said second light exit face, said second optical waveguide being substantially disposed in said first plane and intersecting said second light exit face, wherein said first and second optical waveguides are disposed between said first and second exit faces, are noncolinear and do not intersect one another.
Claim 2
Dependent Claim
187 words
An optical element in a semiconductor laser device comprising: a periodical diffraction grating; a light emitting waveguide, optically coupled with said periodical diffraction grating for optical resonance, said light emitting waveguide emitting light received from a active layer of said element, said light emitting waveguide being substantially disposed in a first plane; first and second light exit faces, each said exit face having an exit portion thereof; a first optical waveguide connected to said light emitting waveguide and providing a first transmission path for light emitted from said light emitting waveguide to said first light exit face, said first optical waveguide being substantially disposed in said first plane and intersecting said first light exit face; and a second optical waveguide connected to said light emitting waveguide and providing a transmission path for light emitted from said light emitting waveguide to said second light exit face, said second optical waveguide being substantially disposed in said first plane and intersecting said second light exit face, wherein said first and second optical waveguides are disposed between said first and second exit faces, are noncolinear and do not intersect one another.
Claim 3
Dependent Claim
46 words
The optical element in a semiconductor laser device as claimed in claim 1, wherein said light emitting waveguide is disposed between said first and second exit faces, said light emitting waveguide being disposed in said first plane and diagonally intersecting said first and second optical waveguides.
Claim 4
Dependent Claim
78 words
The optical element in a semiconductor laser device as claimed in claim 1 wherein the diffraction grating exhibits a waveshape having a periodical concave and convex configuration, with a direction of periodicity being cure bracket substantially parallel to a direction of said light emitting waveguide, said direction being defined as a direction from an intersection of said light emitting waveguide and said first optical waveguide to an intersection of said light emitting waveguide and said second optical waveguide.
Claim 5
Dependent Claim
75 words
The optical element in a semiconductor laser device as claimed in claim 2, wherein the diffraction grating is formed by a wave in a periodical concave and convex configuration, with a wave direction being set substantially parallel to said light emitting waveguide, said direction being defined as a direction from a intersection of said light emitting waveguide and said first optical waveguide to an intersection of said light emitting waveguide and said second optical waveguide.
Claim 6
Dependent Claim
37 words
The optical element of claim 1 wherein said first and second exit faces are disposed in second and third substantially parallel planes, said second and third planes being substantially orthogonally disposed with respect to said first plane.
Claim 7
Dependent Claim
16 words
The optical element of claim 1 wherein said first and second optical waveguides are substantially parallel.
References Cited (Backward Citations)
US4464762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |