Patent US2842972A successfully refreshed from Google Patents.
Patent US4022707A successfully refreshed from Google Patents.
US4022707A
Expired / Lapsed
US
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Athermal laser glass
Assignee: Schott AG
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Filing: 1975-11-17
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Granted: 1977-05-10
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Expires: 1995-11-17
Abstract
Abstract A neodymium-doped phosphate laser glass composition having a low threshold for stimulated emission, a negative temperature coefficient of refractive index, high acid resistence and homogeneity even in large structures comprises P 2 O 5 , Na 2 O or K 2 O, Al 2 O 3 , Nd 2 O 3 , and optionally, F or RO, wherein R is Mg, Ba, Ca, Sr or Zn.
Inventors
- 👤 Otto Deutschbein
- 👤 Marga Faulstich
- 👤 Norbert Neuroth
- 👤 Walter Jahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:35
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; C03C3/247; C03C3/16; C03C3/17; C03C4/00; C03C4/0071; H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; H01S3/17; H01S3/05; H01S3/08; H01S3/08072
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
A neodymium-doped phosphate laser glass composition having a low threshold for stimulated emission and a negative coefficient of the refractive index, comprising from about 65 to about 83% by weight of P 2 O 5 ; from about 7 to about 17% by weight of Na 2 O, K 2 O or mixtures thereof; from about 4 to about 15% by weight of Al 2 O 3 ; up to about 8% by weight of an oxide RO, wherein R is Mg, Ba, Ca, Sr or Zn; up to about 2% by weight of F; and from about 0.5 to about 15% by weight of Nd 2 O 3 and the molar ratio of Na 2 O or K 2 O: P 2 O 5 is between 0.25 and 0.5.
Claim 2
Dependent Claim
130 words
A neodymium-doped phosphate laser glass composition having a low threshold for stimulated emission and a negative coefficient of the refractive index, comprising from about 65 to about 83% by weight of P 2 O 5 ; from about 7 to about 17% by weight of Na 2 O, K 2 O or mixtures thereof; from about 4 to about 15% by weight of Al 2 O 3 ; up to about 8% by weight of an oxide RO, wherein R is Mg, Ba, Ca, Sr or Zn; up to about 2% by weight of F; and from about 0.5 to about 15% by weight of Nd 2 O 3 and the molar ratio of Na 2 O or K 2 O: P 2 O 5 is between 0.25 and 0.5.
Claim 3
Dependent Claim
111 words
The composition of claim 1, comprising from about 68 to about 80% by weight of P 2 O 5 ; from about 8 to about 16% of Na 2 O, K 2 O or mixtures thereof; from about 4 to about 11% by weight of Al 2 O 3 ; up to about 6 by weight of an oxide RO, wherein R is Mg, Ba, Ca, Sr or Zn; up to about 2% by weight of F; and from about 0.5 to about 10% by weight of Nd 2 O 3 and the ratio of Na 2 O or K 2 O: P 2 O 5 is from 0.35 to 0.5.
Claim 4
Dependent Claim
40 words
The composition of claim 1, comprising 71.5% by weight of P 2 O 5 , 12.6% by weight of Na 2 O, 9.9% by weight of Al 2 O 3 and 6.0% by weight of Nd 2 O 3 .
Claim 5
Dependent Claim
44 words
The composition of claim 1, comprising 69.2% by weight of P 2 O 5 , 11.8% by weight of K 2 O, 8.8% of Al 2 O 3 , 4.2% by weight of MgO and 6.0% by weight of Nd 2 O 3 .
Claim 6
Dependent Claim
44 words
In a laser comprising a transparent cavity having reflective surfaces at opposite ends thereof, an active medium, and light-emitting means surrounding said transparent cavity for pumping the medium the improvement which comprises employing as said active medium a glass composition according to claim 1.
Claim 7
Dependent Claim
44 words
In a laser comprising a transparent cavity having reflective surfaces at opposite ends thereof, an active medium, and light-emitting means surrounding said transparent cavity for pumping the medium the improvement which comprises employing as said active medium a glass composition according to claim 2.
Claim 8
Dependent Claim
44 words
In a laser comprising a transparent cavity having reflective surfaces at opposite ends thereof, an active medium, and light-emitting means surrounding said transparent cavity for pumping the medium the improvement which comprises employing as said active medium a glass composition according to claim 3.
Claim 9
Dependent Claim
44 words
In a laser comprising a transparent cavity having reflective surfaces at opposite ends thereof, an active medium, and light-emitting means surrounding said transparent cavity for pumping the medium the improvement which comprises employing as said active medium a glass composition according to claim 4.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |