Patent US4000247A successfully refreshed from Google Patents.
US4000247A
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US
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Dielectric active medium for lasers
Assignee: NTT Inc
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Filing: 1976-02-23
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Granted: 1976-12-28
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Expires: 1996-02-23
Abstract
Abstract A single crystal essentially consists of XM z M' 1 -z P 4 O 12 , (0<z≦1) in which X is lithium and/or sodium, M is neodymium, and M' is yttrium, lanthanum or gadolinium. Said single crystal can be used as a dielectric active medium for lasers, and can be prepared in the form of a bar having a square cross section measuring 5 mm on each side by the top-seeded solution growth method.
Inventors
- 👤 Tomoaki Yamada
- 👤 Kenju Otsuka
- 👤 Harue Suzuki
- 👤 Jun-Ichi Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:45
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; H01S3/1688; C; C30; C30B; C30B15/00; C30B29/00; C30B29/10; C30B29/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
62 words
A dielectric active medium for lasers which consists of a tetraphosphate single crystal whose chemical structure is expressed by the general formula: XM.sub.z M'.sub.1.sub.-z P.sub.4 O.sub.12 (0<z≦1) where: X = at least one of alkali metal elements Li and Na M = element of neodymium M'= at least one rare earth element selected from the group consisting of yttrium, lanthanum and gadolinium.
Claim 2
Dependent Claim
62 words
A dielectric active medium for lasers which consists of a tetraphosphate single crystal whose chemical structure is expressed by the general formula: XM.sub.z M'.sub.1.sub.-z P.sub.4 O.sub.12 (0<z≦1) where: X = at least one of alkali metal elements Li and Na M = element of neodymium M'= at least one rare earth element selected from the group consisting of yttrium, lanthanum and gadolinium.
Claim 3
Dependent Claim
23 words
A dielectric active medium for lasers according to claim 1, wherein the single crystal has a composition of LiNdP 4 O 12 .
Claim 4
Dependent Claim
23 words
A dielectric active medium for lasers according to claim 1, wherein the single crystal has a composition of NaNdP 4 O 12 .
Claim 5
Dependent Claim
29 words
A dielectric active medium for lasers according to claim 1, wherein the single crystal has a composition of LiNd 0 .5 Gd 0 .5 P 4 O 12 .
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) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |