Patent US4836953A successfully refreshed from Google Patents.
US4836953A
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Processes for enhancing fluorescence of TI:A1203 tunable laser crystals
Assignee: Union Carbide Corp
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Filing: 1988-02-09
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Granted: 1989-06-06
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Expires: 2008-02-09
Abstract
Abstract The Figure of Merit of titanium-doped sapphire crystal article suitable for use as a tunable laser is enhanced by treating the article at a temperature of about 1750° C. to 2025° C. in an atmosphere containing at least about 20 volume percent hydrogen.
Inventors
- 👤 Milan R. Kokta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:30
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; C; C30; C30B; C30B29/00; C30B29/10; C30B29/16; C30B29/20; C30B33/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
51 words
A method for enhancing a Ti doped Al 2 O 3 crystal suitable as a laser material comprising maintaining the crystal at a temperature of about 1750° C. to 2025° C. in an inert atmosphere containing sufficient hydrogen for a time sufficient to enhance the Figure of Merit of the crystal.
Claim 2
Independent Claim
51 words
A method for enhancing a Ti doped Al 2 O 3 crystal suitable as a laser material comprising maintaining the crystal at a temperature of about 1750° C. to 2025° C. in an inert atmosphere containing sufficient hydrogen for a time sufficient to enhance the Figure of Merit of the crystal.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein hydrogen is present in the atmosphere in an amount of at least about 20 volume percent.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein hydrogen is present in the atmosphere in an amount of at least about 40 volume percent.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein the crystal is maintained at a temperature of about 1850° C. to 2000° C.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein the crystal contains from about 0.02 to 1.0 atomic percent titanium.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the Figure of Merit of the crystal is improved by at least about 10 percent.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein the Figure of Merit of the crystal is enhanced to at least about 120.
Claim 9
Dependent Claim
27 words
A tunable laser crystal of titanium-doped alumina having from about 0.02 to 1.0 atomic percent of titanium and a Figure of Merit of at least about 150.
Claim 10
Dependent Claim
27 words
A tunable laser crystal of titanium-doped alumina having from about 0.02 to 1.0 atomic percent of titanium and a Figure of Merit of at least about 150.
References Cited (Backward Citations)
US4587035A
Cited
US4711696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |