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Patent US4479223A successfully refreshed from Google Patents.
US4479223A
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US
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Adaptation for improving lifetime of dye laser using coumarin dyes
Assignee: United States Department of the Navy
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Filing: 1982-08-02
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Granted: 1984-10-23
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Expires: 2002-08-02
Abstract
Abstract The effective lasing lifetime of laser dyes including coumarin dyes are significantly extended by the use of an inert cover gas for the laser dye solution such as argon in combination with the employment of a glass filter such as Pyrex disposed between the pumping flash lamp and the dye laser cavity capable of absorbing electromagnetic radiation of about 300 nanometers or shorter wavelength.
Inventors
- 👤 Aaron N. Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:21
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/20; H01S3/213; H01S3/09; H01S3/091; H01S3/0915; H01S3/092
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
In the method of operation of a flash lamp pumped dye laser, having a dye reservoir containing a coumarin dye, the improvement comprising the steps of: providing an inert cover gas for said coumarin dye reservoir; and filtering excitation light from said flash lamp to prevent electromagnetic radiation of 300 nanometers or shorter wavelength from being transmitted to said dye laser whereby the method of operation results in superior effective coumarin dye lifetimes.
Claim 2
Dependent Claim
73 words
In the method of operation of a flash lamp pumped dye laser, having a dye reservoir containing a coumarin dye, the improvement comprising the steps of: providing an inert cover gas for said coumarin dye reservoir; and filtering excitation light from said flash lamp to prevent electromagnetic radiation of 300 nanometers or shorter wavelength from being transmitted to said dye laser whereby the method of operation results in superior effective coumarin dye lifetimes.
Claim 3
Dependent Claim
24 words
The improvement of claim 1 wherein said coumarin dye is selected from the group consisting of Coumarin 1, Coumarin 102, LD490, AC3F and C8F.
Claim 4
Dependent Claim
75 words
In the method of operation of a flash lamp pumped dye laser, having a dye reservoir containing a coumarin dye, the improvement comprising the steps of: providing an inert cover gas comprising argon for said coumarin dye reservoir; and filtering excitation light from said flash lamp to prevent electromagnetic radiation of 300 nanometers or shorter wavelength from being transmitted to said dye laser whereby the method of operation results in superior effective coumarin dye lifetimes.
Claim 5
Dependent Claim
75 words
In the method of operation of a flash lamp pumped dye laser, having a dye reservoir containing a coumarin dye, the improvement comprising the steps of: providing an inert cover gas comprising argon for said coumarin dye reservoir; and filtering excitation light from said flash lamp to prevent electromagnetic radiation of 300 nanometers or shorter wavelength from being transmitted to said dye laser whereby the method of operation results in superior effective coumarin dye lifetimes.
Claim 6
Dependent Claim
38 words
The improvement of claim 3 wherein said filtering step is accomplished by employing a glass filter for absorbing said radiation waves of 300 nanometers or shorter, said filter being located between said flash lamp and said dye laser.
Claim 7
Dependent Claim
14 words
The improvement of claim 4 wherein said glass filter is composed of Pyrex glass.
Claim 8
Dependent Claim
24 words
The improvement of claim 5 wherein said coumarin dye is selected from the group consisting of Coumarin 1, Coumarin 102, LD490, AC3F and C8F.
Claim 9
Dependent Claim
24 words
The improvement of claim 4 wherein said coumarin dye is selected from the group consisting of Coumarin 1, Coumarin 102, LD490, AC3F and C8F.
Claim 10
Dependent Claim
24 words
The improvement of claim 3 wherein said coumarin dye is selected from the group consisting of Coumarin 1, Coumarin 102, LD490, AC3F and C8F.
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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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |