US5291501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fibre with doped core and doped inner cladding, for use in an optical fibre laser
Assignee: University of Southampton
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Filing: 1990-12-11
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Granted: 1994-03-01
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Expires: 2010-12-11
Abstract
Abstract An optical fiber laser includes an optical fiber having a core (14), an inner cladding (12) surrounding the core and an outer cladding (16) surrounding the inner cladding and core. The core (12) is doped with a first laser-active material, preferably, thulium. The inner cladding is doped with a second different laser-active material, for example, neodymium and is pumped by a multimode pump light source such as a diode array. Pumping of the inner cladding (12) causes laser emission in the inner cladding material which, in turn, serves as pump radiation for the laser-active dopant in the core (14).
Inventors
- 👤 David C. Hanna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:36
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/06708; H01S3/09; H01S3/091; H01S3/0915; H01S3/0672; H01S3/094; H01S3/094069
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
105 words
An optical fibre laser, comprising an optical fibre which serves as a resonant cavity and which includes: a core; an inner cladding surrounding the core; an outer cladding surrounding the inner cladding and the core; and a light source, wherein the core is doped with a first laser active material, the inner cladding is doped with second laser active material different from the first laser active material, and the light source is a multimode source arranged to pump the inner cladding so as to cause laser emission therein which, in turn, serves as pump radiation for the laser active dopant in the optical fibre core.
Claim 2
Dependent Claim
105 words
An optical fibre laser, comprising an optical fibre which serves as a resonant cavity and which includes: a core; an inner cladding surrounding the core; an outer cladding surrounding the inner cladding and the core; and a light source, wherein the core is doped with a first laser active material, the inner cladding is doped with second laser active material different from the first laser active material, and the light source is a multimode source arranged to pump the inner cladding so as to cause laser emission therein which, in turn, serves as pump radiation for the laser active dopant in the optical fibre core.
Claim 3
Dependent Claim
17 words
Apparatus according to claim 1, in which the first laser active material is a 3-level laser material.
Claim 4
Dependent Claim
14 words
Apparatus according to claim 2, in which the first laser active material is thulium.
Claim 5
Dependent Claim
14 words
Apparatus according to claim 1, in which the second laser active material is neodymium.
Claim 6
Dependent Claim
108 words
An optical fibre laser, comprising: an optical fibre which serves as a resonant cavity and which includes: a core doped with a first laser active material; an inner cladding which surrounds said core, said inner cladding being doped with a second laser active material different from said first laser active material; an outer cladding surrounding said inner cladding and said core; and a light source arranged to pump said inner cladding, said light source being a multimode source; wherein pumping of said inner cladding by said light source causes laser emission therein which, in turn, serves as pump radiation for said first laser active material in said core.
Claim 7
Dependent Claim
108 words
An optical fibre laser, comprising: an optical fibre which serves as a resonant cavity and which includes: a core doped with a first laser active material; an inner cladding which surrounds said core, said inner cladding being doped with a second laser active material different from said first laser active material; an outer cladding surrounding said inner cladding and said core; and a light source arranged to pump said inner cladding, said light source being a multimode source; wherein pumping of said inner cladding by said light source causes laser emission therein which, in turn, serves as pump radiation for said first laser active material in said core.
Claim 8
Dependent Claim
17 words
Apparatus according to claim 5, in which said first laser active material is a 3-level laser material.
Claim 9
Dependent Claim
14 words
Apparatus according to claim 6, in which said first laser active material is thulium.
Claim 10
Dependent Claim
14 words
Apparatus according to claim 5, in which said second laser active material is neodymium.
Claim 11
Dependent Claim
59 words
An optical fibre for use in an optical fibre laser, said optical fibre comprising: a core doped with a first laser active material; an inner cladding which surrounds said core, said inner cladding being doped with a second laser active material different from said first laser active material; and an outer cladding surrounding said inner cladding and said core.
Claim 12
Dependent Claim
59 words
An optical fibre for use in an optical fibre laser, said optical fibre comprising: a core doped with a first laser active material; an inner cladding which surrounds said core, said inner cladding being doped with a second laser active material different from said first laser active material; and an outer cladding surrounding said inner cladding and said core.
Claim 13
Dependent Claim
17 words
Apparatus according to claim 9, in which said first laser active material is a 3-level laser material.
Claim 14
Dependent Claim
14 words
Apparatus according to claim 10, in which said first laser active material is thulium.
Claim 15
Dependent Claim
14 words
Apparatus according to claim 9, in which said second laser active material is neodymium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |