US4727555A
Expired / Lapsed
US
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Wavelength tuned quantum well lasers
Assignee: SWAMPBUCK CAMO, LLC
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Filing: 1986-01-21
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Granted: 1988-02-23
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Expires: 2006-01-21
Abstract
Abstract Quantum well lasers are wavelength tuned after fabrication to provide a desired shorter emission wavelength. A wavelength tuned quantum well laser is accomplished by thermal annealing the laser for a prescribed period of time. The length of the anneal period and the temperature of annealing are based upon the desired primary emission wavelength to be achieved.
Inventors
- 👤 Robert Burnham
- 👤 Nick Holonvak, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:54
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/81; H10H20/819; H10H20/821; B; B82; B82Y; B82Y20/00; H01; H01S; H01S5/00; H01S5/30; H01S5/34; H01S5/343; H01S5/34313; H10H20/01; H10H20/011; H10H20/013; H01S5/3432
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
45 words
In a wavelength tuned quantum well laser having a primary emission wavelength capable of being changed to a desired emission wavelength shorter than said primary emission wavelength, means to alternately anneal said laser and monitor its emission wavelength until said desired emission wavelength is achieved.
Claim 2
Dependent Claim
45 words
In a wavelength tuned quantum well laser having a primary emission wavelength capable of being changed to a desired emission wavelength shorter than said primary emission wavelength, means to alternately anneal said laser and monitor its emission wavelength until said desired emission wavelength is achieved.
Claim 3
Dependent Claim
19 words
The wavelength tuned quantum well laser of claim 1 wherein said laser comprises elemental materials from the GaAs/GaAlAs regime.
Claim 4
Dependent Claim
16 words
The wavelength tuned laser of claim 1 wherein said laser comprises a single quantum well laser.
Claim 5
Dependent Claim
16 words
The wavelength tuned laser of claim 1 wherein said laser comprises a multiple quantum well laser.
Claim 6
Dependent Claim
53 words
In a wavelength tuned quantum well laser having a primary emission wavelength capable of being changed to a desired emission wavelength shorter than said primary emission wavelength, and means to tune said laser to said desired shorter emission wavelength by incremental thermal annealing of said laser until said desired emission wavelength is achieved.
Claim 7
Dependent Claim
53 words
In a wavelength tuned quantum well laser having a primary emission wavelength capable of being changed to a desired emission wavelength shorter than said primary emission wavelength, and means to tune said laser to said desired shorter emission wavelength by incremental thermal annealing of said laser until said desired emission wavelength is achieved.
Claim 8
Dependent Claim
19 words
The wavelength tuned quantum well laser of claim 5 wherein said laser comprises elemental materials from the GaAs/GaAlAs regime.
Claim 9
Dependent Claim
16 words
The wavelength tuned laser of claim 5 wherein said laser comprises a single quantum well laser.
Claim 10
Dependent Claim
16 words
The wavelength tuned laser of claim 5 wherein said laser comprises a multiple quantum well laser.
Claim 11
Dependent Claim
129 words
In a quantum well laser structure having at least one quantum well with one or more well energy levels therein in its active region and having an emission spectra with a primary emission wavelength retuned to a desired shorter emission wavelength and comprising: (1) means to change said emission spectra of said structure by interdiffusion changes at its quantum well to effectively change said well energy levels, (2) means to check the emission spectra of said structure upon termination of said emission spectra change to determine said primary emission wavelength, (3) means to determine the differential amount between said checked primary emission wavelength and said desired shorter emission wavelength. (4) means to repetitively repeat (1) through (3) until said checked primary emission wavelength approximates said desired shorter emission wavelength.
Claim 12
Dependent Claim
129 words
In a quantum well laser structure having at least one quantum well with one or more well energy levels therein in its active region and having an emission spectra with a primary emission wavelength retuned to a desired shorter emission wavelength and comprising: (1) means to change said emission spectra of said structure by interdiffusion changes at its quantum well to effectively change said well energy levels, (2) means to check the emission spectra of said structure upon termination of said emission spectra change to determine said primary emission wavelength, (3) means to determine the differential amount between said checked primary emission wavelength and said desired shorter emission wavelength. (4) means to repetitively repeat (1) through (3) until said checked primary emission wavelength approximates said desired shorter emission wavelength.
Claim 13
Dependent Claim
26 words
The quantum well laser structure of claim 9 wherein said structure comprises either a single quantum well heterostructure laser or a multiple quantum well heterostructure laser.
References Cited (Backward Citations)
US3312910A
Cited
US3483397A
Cited
US3482189A
Cited
US3523045A
Cited
US3974002A
Cited
US4205329A
Cited
US4338577A
Cited
US4585491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |