US5289484A
Expired / Lapsed
US
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Laser diode
Assignee: Eastman Kodak Co
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Filing: 1992-08-03
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Granted: 1994-02-22
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Expires: 2012-08-03
Abstract
Abstract A high efficiency laser diode that has a narrow beam divergence in a direction perpendicular with respect to the substrate, and a low threshold current.
Inventors
- 👤 Toshiro Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:42
CPC Classifications
B; B82; B82Y; B82Y20/00; H; H01; H01S; H01S5/00; H01S5/30; H01S5/34; H01S5/343; H01S2301/00; H01S2301/18; H01S5/20; H01S5/2004; H01S5/32; H01S5/3211; H01S5/3421; H01S5/34313; H01S5/3432
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
168 words
An optical waveguiding multilayer structure laser diode having a quantum well active layer and bounded by a resonator structure perpendicular thereto, comprising: (a) an optical waveguiding region adjacent to the active layer having at least one high refractive index layer; (b) two spaced cladding regions that sandwich between them the optical waveguiding region and the active layer, each cladding region including: a first cladding layer adjacent to the waveguiding region and having a lower refractive index than the waveguiding region; a first low refractive index layer having a refractive index lower than the first cladding layer; a second cladding layer adjacent to the first low refractive index layer and a second low refractive index layer adjacent to the second cladding layer and having a refractive index lower than the first low refractive index layer; and (c) a low refractive index electrode layered structure connected to each cladding region, with each layer of the electrode structure having a lower index of refraction than any of the cladding region layers.
Claim 2
Dependent Claim
168 words
An optical waveguiding multilayer structure laser diode having a quantum well active layer and bounded by a resonator structure perpendicular thereto, comprising: (a) an optical waveguiding region adjacent to the active layer having at least one high refractive index layer; (b) two spaced cladding regions that sandwich between them the optical waveguiding region and the active layer, each cladding region including: a first cladding layer adjacent to the waveguiding region and having a lower refractive index than the waveguiding region; a first low refractive index layer having a refractive index lower than the first cladding layer; a second cladding layer adjacent to the first low refractive index layer and a second low refractive index layer adjacent to the second cladding layer and having a refractive index lower than the first low refractive index layer; and (c) a low refractive index electrode layered structure connected to each cladding region, with each layer of the electrode structure having a lower index of refraction than any of the cladding region layers.
Claim 3
Dependent Claim
29 words
The laser diode of claim 1 wherein the optical waveguiding region includes two high refractive index layers which sandwich between them a higher refractive index quantum well active layer.
References Cited (Backward Citations)
US4585491A
Cited
JPS61156788A
Cited
JPS61239689A
Cited
US4745612A
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US4862470A
Cited
JPH0376288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-21 | 1997-08-23 | 1998-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-21 | 2001-08-23 | 2002-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-21 | 2005-08-23 | 2006-02-22 | $7700.00 | Window Closed / Lapsed |