US4734910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self mode locked semiconductor laser diode
Assignee: Iconectiv LLC
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Filing: 1987-03-25
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Granted: 1988-03-29
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Expires: 2007-03-25
Abstract
Abstract A semiconductor laser diode which operates in an extended optical cavity in conjunction with a negative resistance device such as a Gunn diode for sustained mode-locked operation. The circuit is capable of generating high repetition rate picosecond optical pulses and is suitable for monolithic or hybrid implementation.
Inventors
- 👤 Hossein Izadpanah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:37
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/065
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A self mode-locked laser system comprising: a semiconductor laser diode having a first facet and a second facet, optical radiation being emitted from said second facet when said diode is driven; an optical system disposed to reflect at least a portion of said optical radiation back into said diode thereby inducing self-coupling in said laser to generate an oscillating light pulse; and an electronic gain means coupled to said laser for controlling said oscillating light pulse in said laser to produce sustained steady-state oscillation, thereby made locking said laser.
Claim 2
Dependent Claim
89 words
A self mode-locked laser system comprising: a semiconductor laser diode having a first facet and a second facet, optical radiation being emitted from said second facet when said diode is driven; an optical system disposed to reflect at least a portion of said optical radiation back into said diode thereby inducing self-coupling in said laser to generate an oscillating light pulse; and an electronic gain means coupled to said laser for controlling said oscillating light pulse in said laser to produce sustained steady-state oscillation, thereby made locking said laser.
Claim 3
Dependent Claim
37 words
A laser system as defined in claim 1, wherein said optical system comprises an optical fiber having one end disposed adjacent said second facet of said laser diode and the other end having a partially reflective coating.
Claim 4
Dependent Claim
21 words
A laser system as defined in claim 2, wherein said partially reflective coating has a reflectivity between 50 and 70 percent.
Claim 5
Dependent Claim
20 words
A laser sytem as defined in claim 2 wherein said optical fiber is from 2 to 9 inches in length.
Claim 6
Dependent Claim
28 words
A laser system as defined in claim 1 wherein said first facet has a reflectivity of 100 percent, and said second facet has a reflectivity of zero percent.
Claim 7
Dependent Claim
27 words
A laser system as defined in claim 1, wherein said negative resistance device comprises a Gunn diode operated in the negative slope portion of its current-voltage characteristic.
Claim 8
Dependent Claim
22 words
A laser system as defined in claim 1, wherein said delay line comprises a 0.1 to 3 inch length of transmission line.
Claim 9
Dependent Claim
20 words
A laser system as defined in claim 1, further comprising a capacitor and an inductor connected to said laser diode.
Claim 10
Dependent Claim
27 words
A laser system as defined in claim 8 further comprising a current source connected to one terminal of said inductor for providing a d.c. laser driving current.
References Cited (Backward Citations)
US4464759A
Cited
US4667331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |