US4079339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light self-injecting semiconductor laser device
Assignee: NEC Corp
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Filing: 1976-05-12
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Granted: 1978-03-14
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Expires: 1996-05-12
Abstract
Abstract A semiconductor laser device in which a part of the laser output is reflected from an external reflector and injected into the laser element with a delay that is less than the relaxation oscillation period of the laser pulse output.
Inventors
- 👤 Kohroh Kobayashi
- 👤 Roy Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:12
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/14; H01S3/00; H01S3/05; H01S3/08; H01S3/081
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
73 words
A pulse-modulatable semiconductor laser device comprising a modulatable semiconductor laser element capable of emitting a train of light pulses in two opposing directions in response to an applied pulse-modulated current signal, each of said light pulses having a spiking oscillation; and an external cavity optically coupled to said laser element, and having a round-trip time that is not less than one-fifth and not more than one-third of the period of said spiking oscillation.
Claim 2
Dependent Claim
73 words
A pulse-modulatable semiconductor laser device comprising a modulatable semiconductor laser element capable of emitting a train of light pulses in two opposing directions in response to an applied pulse-modulated current signal, each of said light pulses having a spiking oscillation; and an external cavity optically coupled to said laser element, and having a round-trip time that is not less than one-fifth and not more than one-third of the period of said spiking oscillation.
Claim 3
Dependent Claim
76 words
A semiconductor laser device comprising a semiconductor laser element capable of emitting light pulses having a relaxation oscillation period of T 1 , and means located external to said laser element in the path of said light pulses for redirecting at least a portion of said light pulses to said laser element with a feedback delay T f , where T f is not less than one-fifth and not more than one-third of T 1 .
Claim 4
Dependent Claim
76 words
A semiconductor laser device comprising a semiconductor laser element capable of emitting light pulses having a relaxation oscillation period of T 1 , and means located external to said laser element in the path of said light pulses for redirecting at least a portion of said light pulses to said laser element with a feedback delay T f , where T f is not less than one-fifth and not more than one-third of T 1 .
Claim 5
Dependent Claim
14 words
The laser device of claim 2, in which said redirecting means includes reflecting means.
Claim 6
Dependent Claim
19 words
The laser device of claim 3, further comprising light-converging means interposed between said laser element and said reflecting means.
Claim 7
Dependent Claim
44 words
The laser device of claim 3, in which said reflecting means includes a first partially reflecting element and a second reflecting element spaced from and in line with said first reflecting element and spaced farther from said laser element than said first reflecting element.
Claim 8
Dependent Claim
20 words
The laser device of claim 5, further comprising light-converging means interposed between said laser element and said first reflecting element.
Claim 9
Dependent Claim
41 words
The laser device of claim 6, further comprising a light-transparent body interposed between said first and second reflecting elements, at least one of said first and second reflecting elements comprising a reflective film secured to one end of said light-transparent body.
Claim 10
Dependent Claim
33 words
The laser device of claim 4, further comprising a light transparent member interposed between said light-converging means and said reflecting means, said reflecting means being secured to one end of said transparent member.
Claim 11
Dependent Claim
32 words
The laser device of claim 8, in which said transparent member is an optical fiber secured at one end to said light-converging means and at its other end to said reflecting means.
Claim 12
Dependent Claim
25 words
The laser device of claim 4, in which said reflecting means comprises means for reflecting back only a preselected frequency component of said light pulses.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |