Patent US4935934A successfully refreshed from Google Patents.
US4935934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed lanthanide-magnesium gallates and laser using monocrystals of these gallates
Assignee: Centre National de la Recherche Scientifique
•
Filing: 1989-04-06
•
Granted: 1990-06-19
•
Expires: 2009-04-06
Abstract
Abstract Mixed lanthanide-magnesium gallates and laser using monocrystals of these gallates. This laser has two flash lamps for longitudinally pumping a monocrystalline rod of a magnetoplumbite-type gallate emitting a light ranging from the UV to the IR, which is amplified between two mirrors and a polarizing prism serving to pass to the outside of the laser the amplified light beam. The gallate is of formula: [La1-xMx1](1-z/3)kMg(1-z)k [Ga1-v-tMv2Crt](11+z)kO19k in which M1 represents Nd, Pr, Ce, Nd-Ce or Pr-Ce in the trivalent state; M2 represents aluminium, optionally partly substituted by scandium and/or indium; k is a number between 0.94 and 1; x is a number between 0 and 1; t is a number such that 0</=t</=0.05, provided that t is NOTEQUAL 0 when x=0 and that x is NOTEQUAL 0 when t=0; v is a number such that 0</=v+t<1 and z is a number between 0 and 0.5.
Inventors
- 👤 Bernard Ferrand
- 👤 Yves Grange
- 👤 Dominique Lefebvre
- 👤 Jeannine Thery
- 👤 Daniel Vivien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:59
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B11/00; C30B15/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
50 words
A power laser tunable in the red and near infrared, which comprises, as an emitter, a monocrystal of a mixed gallate of the formula LaMg(Ga.sub.1-v-t Al.sub.v Cr.sub.t).sub.11 O.sub.19 wherein 0≦v<1 and t≠0, and wherein said power laser further comprises means for tuning said power laser in the red or near-infrared.
Claim 2
Dependent Claim
50 words
A power laser tunable in the red and near infrared, which comprises, as an emitter, a monocrystal of a mixed gallate of the formula LaMg(Ga.sub.1-v-t Al.sub.v Cr.sub.t).sub.11 O.sub.19 wherein 0≦v<1 and t≠0, and wherein said power laser further comprises means for tuning said power laser in the red or near-infrared.
Claim 3
Dependent Claim
132 words
A power laser of a mixed lanthanide-magnesium gallate, of the formula: ##STR4## in which M 1 is selected from the group consisting of neodymium, praseodymium, cerium, neodymium-cerium and praseodymium-cerium pairs, said elements being trivalent; M 2 represents at least one trivalent element selected from the group consisting of aluminum, scandium and indium, provided that the total number of scandium and indium atoms per formula unit is below 0.15(11+z)k; k represents a number from 0.94 to 1; x represents a number from 0 to 1; t represents a number such that 0≦t≦0.05, provided that t is =0 when x≠0, and x is =0 when t≠0; v represents a number such that 0≦v+t<1; z represents a number from 0 to 0.5 and wherein the gallate is monophase and has a hexagonal magnetoplumbite-like crystalline structure.
Claim 4
Dependent Claim
132 words
A power laser of a mixed lanthanide-magnesium gallate, of the formula: ##STR4## in which M 1 is selected from the group consisting of neodymium, praseodymium, cerium, neodymium-cerium and praseodymium-cerium pairs, said elements being trivalent; M 2 represents at least one trivalent element selected from the group consisting of aluminum, scandium and indium, provided that the total number of scandium and indium atoms per formula unit is below 0.15(11+z)k; k represents a number from 0.94 to 1; x represents a number from 0 to 1; t represents a number such that 0≦t≦0.05, provided that t is =0 when x≠0, and x is =0 when t≠0; v represents a number such that 0≦v+t<1; z represents a number from 0 to 0.5 and wherein the gallate is monophase and has a hexagonal magnetoplumbite-like crystalline structure.
Claim 5
Dependent Claim
27 words
A power laser emitting in the infrared, which comprises, as an emitter, a monocrystal of a mixed gallate according to claim 2, wherein M 1 is neodymium.
Claim 6
Dependent Claim
37 words
A power laser emitting in the visible range, which comprises, as an emitter, a monocrystal of a mixed gallate according to claim 2, in which M 1 is selected from the group consisting of praseodymium and praseodymium-cerium.
Claim 7
Dependent Claim
30 words
A power laser as emitting in the ultraviolet or visible, which comprises, as emitter, a monocrystal of a mixed gallate according to claim 2, in which M 1 is cerium.
Claim 8
Dependent Claim
11 words
A laser according to claim 2, wherein M 2 represents aluminum.
Claim 9
Dependent Claim
11 words
A laser according to claim 2, wherein M 1 represents neodymium.
Claim 10
Dependent Claim
16 words
A laser according to claim 7, wherein x is in the range from 0.1 to 0.5.
Claim 11
Dependent Claim
24 words
A laser according to claim 7, wherein said gallate is of the formula: La.sub.1-x Nd.sub.x MgGa.sub.11 O.sub.19 in which x is such that 0<x<0.3.
Claim 12
Dependent Claim
12 words
A laser according to claim 7, wherein x=1 and v exceeds 0.1.
Claim 13
Dependent Claim
23 words
A laser according to claim 7, wherein said gallate is of the formula: La.sub.1-x Nd.sub.x Mg(Ga.sub.1-v Al.sub.v).sub.11 O.sub.19 provided that v>0.143(x-0.3) for 0.3<x<1.
Claim 14
Dependent Claim
20 words
A laser according to claim 2, wherein said gallate is of the formula: La.sub.1-x Nd.sub.x Mg(Ga.sub.0.6 Al.sub.0.4).sub.11 O.sub.19, with 0<x<1.
Claim 15
Dependent Claim
27 words
A laser according to claim 2, wherein said gallate is of the following formula: La.sub.1-x (Nd.sub.1-p Ce.sub.p).sub.x Mg(Ga.sub.1-v Al.sub.v).sub.11 O.sub.19 p being a number such that 0<p<1.
Claim 16
Dependent Claim
16 words
A laser according to claim 13, wherein v equals 0.5 and x equals 0.2 or 0.5.
Claim 17
Dependent Claim
25 words
A laser according to claim 2, wherein said gallate is of the following formula: La.sub.1-x Nd.sub.x Mg(Ga.sub.1-v-t Al.sub.v Cr.sub.t).sub.11 O.sub.19 with 0<x<1, 0<v<1 and t=0.
Claim 18
Dependent Claim
12 words
A laser according to claim 15, wherein v equals 0.7 or 0.4.
Claim 19
Dependent Claim
20 words
A laser according to claim 2, wherein said gallate is of the formula: La.sub.1-x Pr.sub.x Mg(Ga.sub.1-v Al.sub.v).sub.11 O.sub.19 with 0<x<1.
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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |