US5151817A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical frequency second harmonic generator
Assignee: Nokia Bell Labs
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Filing: 1991-05-08
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Granted: 1992-09-29
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Expires: 2011-05-08
Abstract
Abstract Applicants have discovered photo-induced second harmonic generation in rare earth doped glass bodies free of germanium. Moreover, applicants have discovered that multivalent rate-earth doped glass bodies can be made with conversion efficiency of second harmonic generation in excess of 10 -3 % per watt, exceeding the reproducible efficiency of germanium doped glass. In accordance with the invention, a light source of a desired frequency comprises a body of glass doped with a multivalent rare earth element, an optical input source of light at one-half the desired frequency, and utilization means for receiving light passing through said body and utilizing light at the desired frequency.
Inventors
- 👤 Denise M. Krol
- 👤 Jay R. Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:09
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377; G02F1/383
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
A source of light of a desired frequency 2f comprising: a waveguiding body of glass doped with cerium; an optical input source of light at frequency f for directing an input beam into said body of glass; and utilization means for receiving light passing through said body and utilizing light at frequency 2f.
Claim 2
Dependent Claim
53 words
A source of light of a desired frequency 2f comprising: a waveguiding body of glass doped with cerium; an optical input source of light at frequency f for directing an input beam into said body of glass; and utilization means for receiving light passing through said body and utilizing light at frequency 2f.
Claim 3
Dependent Claim
14 words
The source of claim 1 wherein said body of glass is an optical fiber.
Claim 4
Dependent Claim
14 words
The source of claim 1 wherein said optical input source is a semiconductor laser.
Claim 5
Dependent Claim
14 words
The source of claim 1 wherein said utilization means is an optical disk reader.
Claim 6
Dependent Claim
14 words
The source of claim 1 wherein said body of glass is free of germanium.
Claim 7
Dependent Claim
18 words
The source of claim 1 wherein said utilization means comprises means for selectively utilizing light at frequency 2f.
Claim 8
Dependent Claim
82 words
A source of light of a desired frequency 2f comprising: a single mode optical fiber of glass doped with an element chosen from the group consisting of Ce, Eu, Tb, Pr and Sm and containing periodic variations of its second order optical susceptibility whereby said glass converts light of frequency f to light of a second harmonic frequency 2f; and an optical input source of light at frequency f for directing an input beam into said optical fiber through said periodic variations.
Claim 9
Dependent Claim
82 words
A source of light of a desired frequency 2f comprising: a single mode optical fiber of glass doped with an element chosen from the group consisting of Ce, Eu, Tb, Pr and Sm and containing periodic variations of its second order optical susceptibility whereby said glass converts light of frequency f to light of a second harmonic frequency 2f; and an optical input source of light at frequency f for directing an input beam into said optical fiber through said periodic variations.
Claim 10
Dependent Claim
19 words
The source of claim 7 wherein said body of glass is a cerium doped optical fiber free of germanium.
Claim 11
Dependent Claim
25 words
The source of claim 7 wherein said body of glass is a cerium doped optical fiber and said optical input source is a semiconductor laser.
References Cited (Backward Citations)
US4666247A
Cited
US5084881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |