US4805181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High reflectance laser resonator cavity
Assignee: Raytheon Co
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Filing: 1988-03-21
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Granted: 1989-02-14
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Expires: 2008-03-21
Abstract
Abstract A ceramic pump cavity structure for use in solid state lasers wherein the pump cavity comprises sintered alumina having grain sizes of between about 0.3 to 0.5 microns. Sintered alumina pump cavities having grain sizes within this range provide desirable diffuse reflectivity comparable to barium sulfate while at the same time providing a structurally strong cavity which is resistant to cracking and breakage. Combinations of the alumina oxide pump cavity with parasitic light absorbers such as samarium oxide are also disclosed.
Inventors
- 👤 James O. Gibson
- 👤 Victor C. Gearhart
- 👤 Steven E. Birrell
- 👤 Gabriele M. Hawrylow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:21
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/091; H01S3/0915; H01S3/092; H01S3/093; H01S3/10; H01S3/11; H01S3/1123; H01S3/115
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A method for making an alumina ceramic body for use in a laser to provide a pump cavity wherein laser radiation at a lasing wavelength is produced, said method comprising the step of sintering alumina powder at a temperature of between about 1300°-1425° C. for a sufficient time to form a sintered alumina ceramic body having grain sizes of between about 0.3 to 0.5 microns.
Claim 2
Independent Claim
65 words
A method for making an alumina ceramic body for use in a laser to provide a pump cavity wherein laser radiation at a lasing wavelength is produced, said method comprising the step of sintering alumina powder at a temperature of between about 1300°-1425° C. for a sufficient time to form a sintered alumina ceramic body having grain sizes of between about 0.3 to 0.5 microns.
Claim 3
Dependent Claim
39 words
A method according to claim 1 wherein said ceramic body includes an interior surface defining said pump cavity, said method including the additional step of coating said interior surface with a glaze which absorbs radiation at said lasing wavelength.
Claim 4
Dependent Claim
12 words
A method according to claim 2 wherein said glaze contains samarium oxide.
Claim 5
Dependent Claim
58 words
A method according to claim 3 wherein said glaze is formed from a powdered glass comprising approximately 4-5 weight percent Li 2 O, 14-15 weight percent Al 2 O 3 , 33-34 weight percent SiO 2 , 9-10 weight percent B 2 O 3 , 14-15 weight percent SrO and 24-25 weight percent Sm 2 O 3 .
Claim 6
Dependent Claim
29 words
A method according to claim 1 wherein said alumina is sintered for a sufficient time to form a sintered alumina ceramic body having grain sizes of approximately 0.45 microns.
Claim 7
Independent Claim
82 words
A method for increasing the efficiency of a laser pump cavity wherein radiation within the range of 0.4 to 2.0 micrometers is pumped, comprising forming on the interior surface of said cavity a glaze formed from a powdered glass comprising approximately 4-5 weight percent Li 2 O, 14-15 weight percent Al 2 O 3 , 33-34 weight percent SiO 2 , 9-10 weight percent B 2 O 3 , 14-15 weight percent SrO and 24-25 weight percent Sm 2 O 3 .
Claim 8
Independent Claim
82 words
A method for increasing the efficiency of a laser pump cavity wherein radiation within the range of 0.4 to 2.0 micrometers is pumped, comprising forming on the interior surface of said cavity a glaze formed from a powdered glass comprising approximately 4-5 weight percent Li 2 O, 14-15 weight percent Al 2 O 3 , 33-34 weight percent SiO 2 , 9-10 weight percent B 2 O 3 , 14-15 weight percent SrO and 24-25 weight percent Sm 2 O 3 .
Claim 9
Dependent Claim
27 words
A method according to claim 6 wherein said coating is formed to a thickness within the range of about 0.001 to 0.009 inches (0.0254 to 0.229 millimeters).
References Cited (Backward Citations)
US3979696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |