US4523315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Raman gain medium
Assignee: Nokia Bell Labs
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Filing: 1982-04-09
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Granted: 1985-06-11
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Expires: 2002-04-09
Abstract
Abstract A new Raman gain medium, comprising an optical fiber into which molecular gas has been diffused, is disclosed. This new medium combines the advantages of a fiber, i.e., long interaction path, low loss, controllable dispersion, and convenience in handling, with the large Raman wave number shift of the gas, i.e., 4136 cm -1 for H 2 in silica. A laser made with such a medium can provide a relatively high power, tunable, coherent signal source in the near and far infrared regions.
Inventors
- 👤 Julian Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:22
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/30; H01S3/302; H01S3/305
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
67 words
A Raman laser comprising a gain medium comprising a length of filamentary waveguide comprising multiatomic Raman-active molecules contained interstitially in at least some of the waveguide material, the laser further comprising means for coupling pump radiation into the waveguide, means for resonating within the waveguide Raman radiation emitted by the molecules and means for coupling at least a part of the Raman radiation out of the waveguide.
Claim 2
Dependent Claim
67 words
A Raman laser comprising a gain medium comprising a length of filamentary waveguide comprising multiatomic Raman-active molecules contained interstitially in at least some of the waveguide material, the laser further comprising means for coupling pump radiation into the waveguide, means for resonating within the waveguide Raman radiation emitted by the molecules and means for coupling at least a part of the Raman radiation out of the waveguide.
Claim 3
Dependent Claim
29 words
A Raman laser according to claim 1 wherein the filamentary waveguide comprises silica, and the molecules are selected from the group consisting of hydrogen, oxygen, nitrogen and their isotopes.
Claim 4
Dependent Claim
23 words
A Raman laser according to claim 1 wherein the filamentary waveguide comprises a length of optical fiber adapted for transmitting therethrough infrared radiation.
Claim 5
Dependent Claim
20 words
A Raman laser according to claim 1 including means for inhibiting the out-diffusion of the molecules from the waveguide material.
Claim 6
Dependent Claim
32 words
A Raman laser according to claim 4 wherein the inhibiting means comprise a pressurized enclosure, or a refrigerated enclosure, or a fiber coating that is relatively impervious to the interstitial molecular species.
Claim 7
Dependent Claim
56 words
A Raman amplifier comprising a gain medium comprising a length of filamentary waveguide comprising multiatomic Raman-active molecules contained interstitially in at least some of the waveguide material, and further comprising means for coupling pump radiation into the waveguide, means for coupling signal radiation into the waveguide, and means for coupling signal radiation out of the waveguide.
Claim 8
Dependent Claim
56 words
A Raman amplifier comprising a gain medium comprising a length of filamentary waveguide comprising multiatomic Raman-active molecules contained interstitially in at least some of the waveguide material, and further comprising means for coupling pump radiation into the waveguide, means for coupling signal radiation into the waveguide, and means for coupling signal radiation out of the waveguide.
Claim 9
Dependent Claim
29 words
A Raman amplifier according to claim 6 wherein said filamentary waveguide comprises silica, and said molecules are selected from the group consisting of hydrogen, oxygen, nitrogen and their isotopes.
Claim 10
Dependent Claim
23 words
A Raman amplifier according to claim 6 wherein said filamentary waveguide comprises a length of optical fiber adapted for transmitting therethrough infrared radiation.
Claim 11
Dependent Claim
20 words
A Raman amplifier according to claim 6 including means for inhibiting the out-diffusion of said molecules from the waveguide material.
Claim 12
Dependent Claim
32 words
A Raman amplifier according to claim 9 wherein said inhibiting means comprises a pressurized enclosure, or a refrigerated enclosure, or a fiber coating that is relatively impervious to the interstitial molecular species.
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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |