US3883214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective anti-reflective coatings for alkali-metal halide optical components
Assignee: Westinghouse Electric Corp
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Filing: 1972-06-14
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Granted: 1975-05-13
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Expires: 1992-06-14
Abstract
Abstract Optical components for use at a particular wavelength are disclosed which comprise a substrate of singlecrystal alkalimetal halide coated with CaF2 or MgF2 to an optical thickness of about an odd multiple of a quarter of a wavelength. The coating acts as a moisture barrier and increases the transmission of the window. Better adherence and moisture protection is obtained if a layer of As2S3 or Sb2S3 about a multiple of a half wavelength in optical thickness is between the alkali-metal halide and the CaF2 or MgF2. Optical components which may be coated include windows and lenses. In one embodiment the optical components have a double coating on their circumferential edges. The windows of this invention may be used as laser windows.
Inventors
- 👤 Richard A Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:39
CPC Classifications
G; G02; G02B; G02B3/00; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
101 words
AN OPTICAL COMPONENT HAVING TWO FACES AND A CIRCUMFERENTIAL EDGE FOR USE AT A PARTICULAR WAVELENGTH COMPRISING: A. A SUBSTRATE OF A SINGLE-CRYSTAL ALKALIMETAL HALIDE, AND B. A FIRST CONTINUOUS COATING ON ONE OF SAID FACES AND ON SAID EDGE, AND A SECOND CONTINUOUS COATING ON SAID OTHER FACE AND OVERLAPPING SAID FIRST CONTINUOUS COATING ON SAID EDGE, SAID COATINGS BEING SELECTED FROM THE GROUP CONSISTING OF CAF2 AND MGF2 COATINGS ABOUT AN ODD MULTIPLE OF A QUARTER OF SAID WAVELENGTH IN OPTICAL THICKNESS AND AS2S3 AND SB2S3 COATINGS ABOUT A MULTIPLE OF A HALF OF SAID WAVELENGTH IN OPTICAL THICKNESS.
Claim 2
Dependent Claim
101 words
AN OPTICAL COMPONENT HAVING TWO FACES AND A CIRCUMFERENTIAL EDGE FOR USE AT A PARTICULAR WAVELENGTH COMPRISING: A. A SUBSTRATE OF A SINGLE-CRYSTAL ALKALIMETAL HALIDE, AND B. A FIRST CONTINUOUS COATING ON ONE OF SAID FACES AND ON SAID EDGE, AND A SECOND CONTINUOUS COATING ON SAID OTHER FACE AND OVERLAPPING SAID FIRST CONTINUOUS COATING ON SAID EDGE, SAID COATINGS BEING SELECTED FROM THE GROUP CONSISTING OF CAF2 AND MGF2 COATINGS ABOUT AN ODD MULTIPLE OF A QUARTER OF SAID WAVELENGTH IN OPTICAL THICKNESS AND AS2S3 AND SB2S3 COATINGS ABOUT A MULTIPLE OF A HALF OF SAID WAVELENGTH IN OPTICAL THICKNESS.
Claim 3
Dependent Claim
20 words
An optical component according to claim 1 wherein said wavelength is about 5 Mu m to about 11 Mu m.
Claim 4
Dependent Claim
14 words
An optical component according to claim 1 wherein said alkali-metal halide is sodium chloride.
Claim 5
Dependent Claim
30 words
An optical component according to claim 1 wherein said substrate is a disk about 1 to about 1 1/2 inches in diameter and about 3 to about 5 mm. thick.
Claim 6
Dependent Claim
13 words
An optical component according to claim 1 wherein the form of a lens.
Claim 7
Dependent Claim
14 words
An optical component according to claim 1 in the form of a laser window.
Claim 8
Dependent Claim
28 words
An optical component according to claim 1 wherein said coating is a layer of CaF2 about an oDd multiple of a quarter of said wavelength in optical thickness.
Claim 9
Dependent Claim
53 words
An optical component according to claim 1 wherein said coating is a layer of As2S3 about a multiple of a half of said wavelength in optical thickness coated with a layer selected from the group consisting of CaF2 and MgF2 about an odd multiple of a quarter of said wavelength in optical thickness.
Claim 10
Dependent Claim
19 words
An optical component according to claim 8 wherein said layer of As2S3 is coated with a layer of CaF2.
Claim 11
Dependent Claim
53 words
An optical component according to claim 1 wherein said coating is a layer of Sb2S3 about a multiple of a half of said wavelength in optical thickness coated with a layer selected from the group consisting of CaF2 and MgF2 about an odd multiple of a quarter of said wavelength in optical thickness.
Claim 12
Dependent Claim
19 words
An optical component according to claim 10 wherein said layer of Sb2S3 is coated with a layer of CaF2.
Claim 13
Dependent Claim
12 words
An optical component according to claim 1 wherein said multiple is one.
Claim 14
Dependent Claim
16 words
An optical component according to claim 1 wherein said first and second coatings are the same.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |