US4587035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for enhancing Ti:Al2 O3 tunable laser crystal fluorescence by annealing
Assignee: Union Carbide Corp
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Filing: 1985-05-20
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Granted: 1986-05-06
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Expires: 2005-05-20
Abstract
Abstract Annealing process for titanium doped sapphire tunable laser material to enhance lasing efficiency. The process comprises (I) heating the material in a vacuum of at least 1×10 -6 torr at a temperature in the range of about 1850° to 2,000° C. for at least 48 hours and (II) cooling the material from its temperature in said range to 1500° C. at a rate not exceeding 2° C. per minute.
Inventors
- 👤 Milan R. Kokta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:55
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; Y; Y10; Y10S; Y10S148/00; Y10S148/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A process for minimizing the absorption of Ti:Al 2 O 3 crystal material in the range of 750 to 950 nm which comprises (i) heating the crystal material in a vacuum of at least 1×10 -6 torr at a temperature in the range of about 1850° to 2000° C. for at least 48 hours (ii) cooling the material from its temperature in said range to 1500° C. at a rate not exceeding 2° C. per minute, the cooled material exhibiting a higher lasing efficiency than the Ti:Al 2 O 3 crystal material prior to said heating and cooling.
Claim 2
Dependent Claim
98 words
A process for minimizing the absorption of Ti:Al 2 O 3 crystal material in the range of 750 to 950 nm which comprises (i) heating the crystal material in a vacuum of at least 1×10 -6 torr at a temperature in the range of about 1850° to 2000° C. for at least 48 hours (ii) cooling the material from its temperature in said range to 1500° C. at a rate not exceeding 2° C. per minute, the cooled material exhibiting a higher lasing efficiency than the Ti:Al 2 O 3 crystal material prior to said heating and cooling.
References Cited (Backward Citations)
GB595445A
Cited
US4416723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |