Patent US4099840A successfully refreshed from Google Patents.
US4099840A
Expired / Lapsed
US
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Multilayer reflector for gas discharge laser
Assignee: US Philips Corp
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Filing: 1976-09-24
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Granted: 1978-07-11
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Expires: 1996-09-24
Abstract
Abstract A multilayer reflector of which the last layer most remote from the substrate and having a high refractive index is vapor-deposited from a mixture containing a metal or oxide of an element from group 4b of the periodic table and a metal oxide from the group of beryllium oxide, magnesium oxide and calcium oxide, is particularly resistant to hydrogen and ultraviolet light and is hence suitable for application in a laser which is to have a long life.
Inventors
- 👤 Johannes Van der Wal
- 👤 Wilhelmus Adrianus Jacobus Gielens
- 👤 Johannes Maria Marinus Pasmans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:58
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/0816; G02B5/0825; G02B5/0833; C; C03; C03C; C03C17/00; C03C17/34; C03C17/3411; C03C17/3417; H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/08059; H01S3/02; H01S3/03; H01S3/034; H01S3/0346
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A reflector comprising a substrate bearing a system of oxide layers alternately having high and low refractive indices, wherein at least the last layer in the system which is most remote from the substrate having a high refractive index consists of a mixture of at least one of the oxides of thorium, titanium, zirconium or hafnium and at least one of the oxides of beryllium, magnesium or calcium.
Claim 2
Dependent Claim
68 words
A reflector comprising a substrate bearing a system of oxide layers alternately having high and low refractive indices, wherein at least the last layer in the system which is most remote from the substrate having a high refractive index consists of a mixture of at least one of the oxides of thorium, titanium, zirconium or hafnium and at least one of the oxides of beryllium, magnesium or calcium.
Claim 3
Dependent Claim
55 words
A method of manufacturing a reflector as claimed in claim 1, characterized in that the layers are vapor deposited and during the vapor deposition of at least the last layer the quantity of oxide used of beryllium, magnesium or calcium is between 1% by weight and 30% by weight of the total mixture of oxides.
Claim 4
Dependent Claim
29 words
A method as claimed in claim 2, characterized in that at least the last layer is vapor-deposited from a mixture containing 5 to 15% by weight of calcium oxide.
Claim 5
Dependent Claim
41 words
A method as claimed in claim 3, characterized in that at least the last layer having a high refractive index is vapor-deposited from a mixture containing approximately 5% by weight of calcium oxide and approximately 95% by weight of titanium oxide.
Claim 6
Dependent Claim
49 words
A method of manufacturing a reflector as claimed in claim 1, characterized in that the layers are vapor-deposited from at least one of the metals thorium, titanium, hafnium and zirconium and at least one of the metal oxides beryllium oxide, magnesium oxide and calcium oxide in an oxidizing atmosphere.
Claim 7
Dependent Claim
49 words
A method of manufacturing a reflector as claimed in claim 1, characterized in that the layers are sputtered from at least one of the metals thorium, titanium, hafnium and zirconium and at least one of the metal oxides beryllium oxide, magnesium oxide and calcium oxide in an oxidizing atmosphere.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |