US3233189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser utilizing rare earth activated yttrium and lanthanum trifluoride active media
Assignee: AT&T Inc
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Filing: 1962-03-29
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Granted: 1966-02-01
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Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 Howard J Guggenheim
- 👤 Leo F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:25
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
AN OPTICAL MASER COMPRISING AN ACTIVE MEDIUM CONSISTING ESSENTIALLY OF A SUBSTANTIALLY MONOCRYSTALLINE-TRIVALENT METAL FLUORIDE HOST LATTICE SELECTED FROM THE GROUP CONSISTING OF LANTHANUM TRIFLUORIDE AND YTTRIUM TRIFLUORIDE IN WHICH FROM ABOUT .01 PERCENT TO ABOUT 30 PERCENT OF THE TRIVALENT METAL IONS HAVE BEEN REPLACED BY TRIVALENT RARE EARTH FLUORESCENT IONS, PUMPING MEANS FOR ESTABLISHING A NEGATIVE TEMPERATURE STATE BETWEEN A PAIR OF OPTICALLY CONNECTED ENERGY LEVELS OF SAID RARE EARTH IONS, AND MEANS FOR STIMULATING COHERENT EMISSION AT THE WAVELENGTH CORRESPONDING TO THE SEPARATION OF SAID LEVELS.
Claim 2
Dependent Claim
89 words
AN OPTICAL MASER COMPRISING AN ACTIVE MEDIUM CONSISTING ESSENTIALLY OF A SUBSTANTIALLY MONOCRYSTALLINE-TRIVALENT METAL FLUORIDE HOST LATTICE SELECTED FROM THE GROUP CONSISTING OF LANTHANUM TRIFLUORIDE AND YTTRIUM TRIFLUORIDE IN WHICH FROM ABOUT .01 PERCENT TO ABOUT 30 PERCENT OF THE TRIVALENT METAL IONS HAVE BEEN REPLACED BY TRIVALENT RARE EARTH FLUORESCENT IONS, PUMPING MEANS FOR ESTABLISHING A NEGATIVE TEMPERATURE STATE BETWEEN A PAIR OF OPTICALLY CONNECTED ENERGY LEVELS OF SAID RARE EARTH IONS, AND MEANS FOR STIMULATING COHERENT EMISSION AT THE WAVELENGTH CORRESPONDING TO THE SEPARATION OF SAID LEVELS.
References Cited (Backward Citations)
US2929922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |