Patent US2385000A successfully refreshed from Google Patents.
Patent US3680001A successfully refreshed from Google Patents.
US3680001A
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Dynamic am control of the transverse modes of a self-pulsing semiconductor laser
Assignee: AT&T Inc
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Filing: 1971-05-13
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Granted: 1972-07-25
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Expires: 1991-05-13
Abstract
Abstract A semiconductor laser, at appropriate values of current above threshold, enters a nonlinear regime characterized by (1) a continuous region in which the output radiation self-pulses simultaneously in two competing transverse modes and/or (2) a bistable region in which the output radiation self-pulses in either of two noncompeting transverse modes, but not both. In one embodiment the laser is current biased in one of these regions and is switched between different transverse modes by amplitude modulating the injection current.
Inventors
- 👤 Thomas Lee Paoli
- 👤 Jose Ellis Ripper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:45
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/30; H01S5/06; H01S5/068; H01S5/0683; Y; Y10; Y10S; Y10S148/00; Y10S148/065; Y10S148/067; Y10S148/072; Y10S148/169
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
76 words
A method of controlling the transverse mode distribution of a semiconductor laser comprising the steps of: applying to said laser pumping energy effective to induce in the optical output thereof self-pulsing in a nonlinear regime in which different transverse mode distributions may exist at different pulsing frequencies; and amplitude modulating said pumping energy so that the selfpulsing output of said laser changes from one transverse mode distribution to another in accordance with information to be transmitted.
Claim 2
Independent Claim
76 words
A method of controlling the transverse mode distribution of a semiconductor laser comprising the steps of: applying to said laser pumping energy effective to induce in the optical output thereof self-pulsing in a nonlinear regime in which different transverse mode distributions may exist at different pulsing frequencies; and amplitude modulating said pumping energy so that the selfpulsing output of said laser changes from one transverse mode distribution to another in accordance with information to be transmitted.
Claim 3
Dependent Claim
68 words
The method of claim 1 wherein said pumping energy induces self-pulsing in a bistable region of said nonlinear regime in which either of said transverse mode distributions may exist separately, but not both simultaneously, and said pumping energy is modulated from a point above a first critical level to a point below a second critical level so that said output switches abruptly between the said transverse mode distributions.
Claim 4
Dependent Claim
50 words
The method of claim 1 wherein said pumping energy induces self-pulsing in a continuous region of said nonlinear regime in which both of said transverse mode distributions exist simultaneously at a pulSing frequency intermediate the pulsing frequencies that said distributions would have if each were oscillating independent of the other.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said laser comprises a p-n junction laser.
Claim 6
Dependent Claim
40 words
The method of claim 4 wherein said laser is switched between a first transverse mode distribution perpendicular to the plane of the junction of said laser and a second transverse mode distribution perpendicular to the plane junction of said laser.
Claim 7
Dependent Claim
14 words
The method of claim 4 wherein said laser comprises a double heterostructure junction laser.
Claim 8
Dependent Claim
26 words
The method of claim 6 wherein said laser comprises an AlGaAs double heterostructure junction laser and said pumping energy is provided by forward bias direct current.
Claim 9
Dependent Claim
68 words
Optical apparatus comprising: a semiconductor laser, pump means for applying pumping energy to said laser effective to induce therein self-pulsing in a nonlinear regime in which different transverse mode distributions may exist at different pulsing frequencies, and modulation means for amplitude modulating said pumping energy so that the self-pulsing output of said laser changes from one transverse mode distribution to another in accordance with information to be transmitted.
Claim 10
Dependent Claim
68 words
Optical apparatus comprising: a semiconductor laser, pump means for applying pumping energy to said laser effective to induce therein self-pulsing in a nonlinear regime in which different transverse mode distributions may exist at different pulsing frequencies, and modulation means for amplitude modulating said pumping energy so that the self-pulsing output of said laser changes from one transverse mode distribution to another in accordance with information to be transmitted.
Claim 11
Dependent Claim
73 words
The apparatus of claim 8 wherein said pump means induces self-pulsing in a bistable region of said nonlinear regime in which either of said transverse mode distributions may exist separately, but not both simultaneously, and said modulation means modulates the amplitude of said pump energy from a point above a first critical level to a point below a second critical level so that said output switches abruptly between the said transverse mode distributions.
Claim 12
Dependent Claim
50 words
The apparatus of claim 8 wherein said pump means induces self-pulsing in a continuous region of said nonlinear regime in which both of said transverse mode distributions exist simultaneously at a pulsing frequency intermediate the pulsing frequencies that said distributions would have if each were oscillating independent of the other.
Claim 13
Dependent Claim
13 words
The apparatus of claim 8 wherein said laser comprises a p-n junction laser.
Claim 14
Dependent Claim
40 words
The apparatus of claim 11 wherein said laser is switched between a first transverse mode distribution perpendicular to the plane of the junction of said laser and a second transverse mode distribution perpendicular to the plane junction of said laser.
Claim 15
Dependent Claim
14 words
The apparatus of claim 11 wherein said laser comprises a double heterostructure junction laser.
Claim 16
Dependent Claim
26 words
The apparatus of claim 13 wherein said laser comprises an AlGaAs double heterostructure junction laser and said pumping energy is provided by forward bias direct current.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |