US4284962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excimer-pumped four level blue-green solid state laser
Assignee: United States Department of the Navy
•
Filing: 1979-07-11
•
Granted: 1981-08-18
•
Expires: 1999-07-11
Abstract
Abstract An efficient, four-level, blue-green, excimer-pumped laser which is opera at room temperature. The laser element includes a CaWO 4 crystal which has been codoped with trivalent thulium activator ions and divalent ytterbium sensitizer ions. Energy is transferred from the absorbing Yb 2+ ions to the Tm 3+ ions and the laser transition is from the 1 D 2 multiplet to the ground 3 F 4 of the Tm 3+ ion. This transition terminates on an excited state; therefore, the laser action is four-level.
Inventors
- 👤 Leon Esterowitz
- 👤 Roger E. Allen
- 👤 Melvin R. Kruer
- 👤 Filbert J. Bartoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:10
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; H01S3/1601; H01S3/1603; H01S3/1613; H01S3/09; H01S3/091; H01S3/094; H01S3/09403; H01S3/094038
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
A solid state laser element for four-level blue-green operation in a laser system and comprising: a host crystal of calcium tungstate; divalent sensitizer ions uniformly dispersed within said host crystal, wherein said divalent sensitizer ions are ytterbium and said divalent sensitizer ions of ytterbium have a concentration of from about 0.005% to about 0.20% by weight; and trivalent rare-earth activator ions uniformly dispersed within said host crystal.
Claim 2
Dependent Claim
67 words
A solid state laser element for four-level blue-green operation in a laser system and comprising: a host crystal of calcium tungstate; divalent sensitizer ions uniformly dispersed within said host crystal, wherein said divalent sensitizer ions are ytterbium and said divalent sensitizer ions of ytterbium have a concentration of from about 0.005% to about 0.20% by weight; and trivalent rare-earth activator ions uniformly dispersed within said host crystal.
Claim 3
Dependent Claim
15 words
A solid-state laser element as claimed in claim 1 wherein: said trivalent ions are thulium.
Claim 4
Dependent Claim
29 words
A solid-state laser element as claimed in claim 2 wherein: said trivalent rare-earth activator ions of thulium have a concentration of from about 0.5% to about 20% by weight.
Claim 5
Dependent Claim
68 words
A solid-state laser element for four-level blue-green operation in a laser system and comprising: a host crystal of calcium tungstate; divalent sensitizer ions uniformly dispersed within said host crystal; and trivalent rare-earth activator ions uniformly dispersed within said host crystal, wherein said trivalent rare-earth activator ions are thulium and said trivalent rare-earth activator ions of thulium have a concentration of from about 0.5% to about 20% by weight.
Claim 6
Dependent Claim
68 words
A solid-state laser element for four-level blue-green operation in a laser system and comprising: a host crystal of calcium tungstate; divalent sensitizer ions uniformly dispersed within said host crystal; and trivalent rare-earth activator ions uniformly dispersed within said host crystal, wherein said trivalent rare-earth activator ions are thulium and said trivalent rare-earth activator ions of thulium have a concentration of from about 0.5% to about 20% by weight.
Claim 7
Dependent Claim
15 words
A solid-state laser element as claimed in claim 4 wherein: said divalent ions are ytterbium.
References Cited (Backward Citations)
US3248667A
Cited
US3624549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |