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US3779732A
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Method of making glass lasers of increased heat dissipation capability
Assignee: Schott Optical Glass Inc
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Filing: 1971-04-16
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Granted: 1973-12-18
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Expires: 1991-04-16
Abstract
Abstract Glass lasers containing at least 1 mole percent of lithium oxide based on the total glass composition expressed in oxide content and having a compressive stress surface layer whereby increased strength and increased heat dissipation capability is obtained. The compressive stress surface layer has essentially the same composition as the remainder of the glass laser except that the concentration of lithium ions is less than the remainder of said glass laser, and the concentration of ions of a different alkali metal is greater than the remainder of the glass laser. Laser glasses are generally first acid washed and then contacted with a salt of an alkali metal other than lithium at an elevated temperature and for a sufficient period of time to replace a portion of the lithium ions in the surface of the glass laser with the ions of the different alkali metal and thereby form the compressive stress layer in the surface, but for a time insufficient to produce any substantial relaxation of the stress formed in the surface layer. As a result of this treatment there is developed on the surface of the glass laser a thin surface layer of low order tension and a thicker underlayer of high compressive stress. The tension surface layer is then removed by acid wash to expose the compression layer.
Inventors
- 👤 L Spanoudis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:17
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; H01S3/17; C; C03; C03C; C03C15/00; C03C21/00; C03C21/001; C03C21/002; C03C4/00; C03C4/0071; H01S3/05; H01S3/08; H01S3/08072; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
21 words
The method as set forth in claim 1 wherein said elevated temperature is below the strain point of the glass laser.
Claim 2
Dependent Claim
29 words
The method as set forth in claim 2 wherein the elevated temperature is within the range of 50* to 100* C below the strain point of the glass laser.
Claim 3
Dependent Claim
15 words
The method as set forth in claim 1 wherein the different alkali metal is sodium.
Claim 4
Dependent Claim
36 words
The method as set forth in claim 1 wherein the salt of a different alkali metal is a member selected from the group consisting of sodium sulfate, sodium nitrate, sodium chloride, sodium fluoride and sodium phosphate.
Claim 5
Dependent Claim
24 words
The method as set forth in claim 1 wherein the glass laser has a content of lithium oxide of at least 5 mole percent.
Claim 6
Dependent Claim
19 words
The method as set forth in claim 1 wherein the salt of a different alkali metal is sodium nitrate.
Claim 7
Dependent Claim
20 words
The method as set forth in claim 1 wherein the salt of a different alkali metal is in molten form.
Claim 8
Dependent Claim
41 words
The method as set forth in claim 1 wherein the glass laser contains the following ingredients in the approximate mole percent: SiO2- 45 to 75 Al2O3- 0 to 8 Li2O- 15 to 35 CaO- 0.5 to 30 Nd2O3- 0.1 to 2
Claim 9
Dependent Claim
45 words
The method as set forth in claim 1 wherein the glass laser contains the following ingredients in the approximate mole percent: SiO2- 48 to 65 Al2O3- 0 to 8 Li2O- 20 to 30 CaO- 5 to 25 CeO2- 0.1 to 0.3 Nd2O3- 0.1 to 2
Claim 10
Independent Claim
207 words
A method for strengthening a silicate glaSs laser containing at least about 1 mole percent lithium oxide based on the total glass composition expressed as oxide content comprising: applying to at least one surface of said glass laser an acidic etching agent to remove at least a portion of the surface defects and flaws of said surface; thereafter applying to said at least one surface, an ion exchange salt consisting of a salt of a different alkali metal and subjecting the glass laser in contact with said salt to elevated temperature below the strain point of the glass laser for a sufficient period of time to exchange at least a portion of the lithium ions in said surface for the ions of said different alkali metal in contact with the surface of the glass and thereby develop a compressive stress layer in the glass laser, but for a time insufficient to relax the stress produced in the surface of the glass laser, the exchange of ions being capable of producing a tension surface layer over the compressive layer, and thereafter treating said surface with an acidic etching agent of sufficient acid strength and for a sufficient period of time to remove the tension surface layer formed thereon.
Claim 11
Dependent Claim
20 words
A method as set forth in claim 11 wherein said elevated temperature is below the strain point of the glass.
Claim 12
Independent Claim
203 words
A method for strengthening a shaped silicate glass laser article containing at least about 1 mole percent lithium oxide based on the total glass composition expressed as oxide content comprising: applying to at least one surface of the laser an acidic etching agent comprising hydrofluoric acid to remove at least a portion of the surface defects and flaws of said surface, thereafter washing the laser and contacting said at least one surface with an ion exchange salt consisting of a molten salt of sodium at an elevated temperature below the strain point of the glass for a sufficient period of time to exchange at least a portion of the lithium ions in said surface with the sodium ions of said salt in contact with said surface, and thereby develop a compressive stress layer in the glass laser, but for a time insufficient to relax the stress produced in the surface of the glass laser, the exchange of ions being capable of producing a tension surface layer over the compressive layer, and thereafter washing said at least one surface with hydrofluoric acid of sufficient strength and for a sufficient period of time to remove a tension layer formed in said at least one surface.
Claim 13
Independent Claim
161 words
A method for strengthening silicate glass lasers containing at least about 1 mole percent of lithium oxide based on the total glass composition expressed as oxide content comprising: contacting a surface of said glass laser with an acidic etching agent to remove at least a portion of the surface defects and flaws of said surface, contacting at least one surface of said glass laser with an ion exchange salt consisting of a salt of a different alkali metal and subjecting the glass in contact with said salt of said different alkali metal to elevated temperature for a sufficient period of time to exchange at least a portion of said lithium ions in the surface of said glass laser for the ions of said different alkali metal in contact with the surface of the glass and thereby develop a compressive stress layer in the glass, but for a time insufficient to relax the stress produced in said surface of the glass laser.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |