EP0358401A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Laser systems
Assignee: British Telecommunications PLC
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Filing: 1989-08-30
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Granted: —
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Expires: 2009-08-30
Abstract
Abstract The invention relates to laser systems of the type comprising optical fibre amplifiers. A laser system comprises a first laser 1 and a second laser 2. The second laser 2 is pumped at a first wavelength λ₁ and caused to lase at a second wavelength λ₂. The first laser 1 has absorption bands at λ₁ and λ₂. The output λ₂ of laser 2 and the remnant pump at λ₁ are coupled and both are used to pump the first laser 1, thus causing laser 1 to lase at a third wavelength λ₃.
Inventors
- 👤 Colin Anderson Millar
- 👤 Jonathan Richard Armitage
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 15:26
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/09; H01S3/091; H01S3/094
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
59 words
A laser system comprising: a first laser pumpable at a first and a second wavelength; a second laser pumpable at the first wavelength whereby it is caused to lase at the second wavelength; the output of the second laser at the second wavelength, and the remnant pump at the first wavelength both being coupled to pump the first laser.
Claim 2
Dependent Claim
59 words
A laser system comprising: a first laser pumpable at a first and a second wavelength; a second laser pumpable at the first wavelength whereby it is caused to lase at the second wavelength; the output of the second laser at the second wavelength, and the remnant pump at the first wavelength both being coupled to pump the first laser.
Claim 3
Dependent Claim
20 words
A system according to claim 1 wherein the first laser is a single mode optical fibre doped with rare-earth ions.
Claim 4
Dependent Claim
20 words
A system according to claim 2 wherein the first laser is a silica based optical fibre doped with erbium ions.
Claim 5
Independent Claim
22 words
A system according to any of the preceding claims wherein the second laser comprises a fluorozirconate based laser doped with erbium ions.
Claim 6
Dependent Claim
15 words
A system according to Claim 4 wherein the second laser is a single mode fibre.
Claim 7
Dependent Claim
25 words
A system according to claim 1, 2 or 3 wherein the second laser is a silica based fibre doped with both neodymium and ytterbium ions.
Claim 8
Independent Claim
12 words
A system substantially as herein described with reference to the accompanying drawings.
Claim 9
Independent Claim
12 words
A system substantially as herein described with reference to the accompanying drawings.
References Cited (Backward Citations)
US4589118A
Cited
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