US4485474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection laser modulator with external resonator
Assignee: BAE Systems National Security Solutions Inc
•
Filing: 1981-12-10
•
Granted: 1984-11-27
•
Expires: 2001-12-10
Abstract
Abstract An injection laser is provided with a modulator which includes an external resonator cavity including a lithium niobate crystal and a spherical mirror closely coupled to the rear end of the laser with a source of bias voltage for selectively tuning the resonator for high frequency modulating the laser.
Inventors
- 👤 Johann M. Osterwalder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:51
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/105; H01S3/106; H01S3/107; H01S5/00; H01S5/10; H01S5/14
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
38 words
A high frequency modulating system for a laser comprising: a laser, bias means for said laser, and an external tunable resonator comprising an electro-optic device optically coupled to said laser for selective shifting of said laser between modes.
Claim 2
Dependent Claim
38 words
A high frequency modulating system for a laser comprising: a laser, bias means for said laser, and an external tunable resonator comprising an electro-optic device optically coupled to said laser for selective shifting of said laser between modes.
Claim 3
Dependent Claim
13 words
The laser system of claim 1 wherein said laser is an injection laser.
Claim 4
Dependent Claim
13 words
The system of claim 1 wherein said electro-optic device is an electro-optic crystal.
Claim 5
Dependent Claim
45 words
The system of claim 3 wherein said laser includes a rear facet, and said resonator means comprises a mirror positioned in close proximity to and aligned with the rear facet of said laser, and said electro-optic crystal is disposed between said mirror and said laser.
Claim 6
Dependent Claim
12 words
The system of claim 4 wherein said mirror is a spherical mirror.
Claim 7
Dependent Claim
16 words
The system of claim 5 wherein said mirror is moveable toward and away from said laser.
Claim 8
Dependent Claim
14 words
The system of claim 3 wherein said elector-optic crystal is a lithium niobate crystal.
Claim 9
Dependent Claim
117 words
A high frequency laser modulating system, comprising: a laser, bias means for said laser, and an external tunable resonator optically coupled to said laser for selectively changing the natural selected modes of said laser: wherein said laser is a GaAlAs chip having front and rear facets and mounted on a support member, a source of bias current for said laser chip, and said resonator comprises a spherical mirror disposed in close proximity to the rear facet of said laser and aligned therewith, said mirror mounted for movement toward and away from said laser chip, an electro-optic crystal disposed between said laser and said mirror, and a source of modulation voltage connected for application to said electro-optic crystal.
Claim 10
Dependent Claim
117 words
A high frequency laser modulating system, comprising: a laser, bias means for said laser, and an external tunable resonator optically coupled to said laser for selectively changing the natural selected modes of said laser: wherein said laser is a GaAlAs chip having front and rear facets and mounted on a support member, a source of bias current for said laser chip, and said resonator comprises a spherical mirror disposed in close proximity to the rear facet of said laser and aligned therewith, said mirror mounted for movement toward and away from said laser chip, an electro-optic crystal disposed between said laser and said mirror, and a source of modulation voltage connected for application to said electro-optic crystal.
Claim 11
Dependent Claim
14 words
The system of claim 8 wherein said electro-optic crystal is a lithium niobate crystal.
Claim 12
Dependent Claim
43 words
A high frequency modulating system for a laser, comprising: an injection laser, bias means for said laser, and an external tunable resonator comprising an electro-optic device optically coupled to said laser for selective high frequency shifting between the natural modes of said laser.
Claim 13
Dependent Claim
43 words
A high frequency modulating system for a laser, comprising: an injection laser, bias means for said laser, and an external tunable resonator comprising an electro-optic device optically coupled to said laser for selective high frequency shifting between the natural modes of said laser.
Claim 14
Dependent Claim
13 words
The system of claim 10 wherein said electro-optic device is an electro-optic crystal.
Claim 15
Dependent Claim
45 words
The system of claim 11 wherein said laser includes a rear facet, and said resonator means comprises a mirror positioned in close proximity to and aligned with the rear facet of said laser, and said electro-optic crystal is disposed between said mirror and said laser.
Claim 16
Dependent Claim
12 words
The system of claim 12 wherein said mirror is a spherical mirror.
Claim 17
Dependent Claim
16 words
The system of claim 13 wherein said mirror is movable toward and away from said laser.
Claim 18
Dependent Claim
14 words
The system of claim 13 wherein said electro-optic crystal is a lithium niobate crystal.
Claim 19
Dependent Claim
90 words
A high frequency modulating system for a laser comprising: a laser comprising a chip having front and rear facets and mounted on a support member, a source of bias current for said laser chip, and a resonator comprising a spherical mirror disposed in close proximity to the rear facet of said laser and aligned therewith, said mirror mounted for movement toward and away from said laser chip, and electro-optic crystal disposed between said laser and said mirror, and a source of modulation voltage connected for application to said electro-optic crystal.
Claim 20
Dependent Claim
90 words
A high frequency modulating system for a laser comprising: a laser comprising a chip having front and rear facets and mounted on a support member, a source of bias current for said laser chip, and a resonator comprising a spherical mirror disposed in close proximity to the rear facet of said laser and aligned therewith, said mirror mounted for movement toward and away from said laser chip, and electro-optic crystal disposed between said laser and said mirror, and a source of modulation voltage connected for application to said electro-optic crystal.
Claim 21
Dependent Claim
14 words
The system of claim 16 wherein said electro-optic crystal is a lithium niobate crystal.
References Cited (Backward Citations)
US4101845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |