PATENTSCOPE will be unavailable a few hours for maintenance reason on Monday 03.02.2020 at 10:00 AM CET
Search International and National Patent Collections
Some content of this application is unavailable at the moment.
If this situation persists, please contact us atFeedback&Contact
1. (WO1989000351) HIGH REFLECTANCE PUMPING CAVITY
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters
CLAIMS

What is Claimed is:

1. A ceramic structure for use in a laser to provide a pump cavity wherein laser radiation at a lasing
wavelength is produced, said ceramic structure comprising a ceramic body having an interior surface defining said pump cavity wherein said ceramic body comprises sintered alumina having grain sizes of between about 0.3 to 0.5 micrometers .

2. A ceramic structure according to Claim 1 wherein said sintered alumina is formed to have a packing density of between about 70 to 87 percent.

3. A ceramic structure according to Claim 1 wherein said laser is a Nd:YAG laser.

4. A ceramic structure according to Claim 1 wherein said laser is a Nd-doped gadolinium scandium gallium garnet laser.

5. A ceramic structure according to Claim 1 wherein said laser has a pumping radiation within the range from about 0.4 to 2.0 micrometers.

6. A ceramic structure according to Claim 3 wherein said grain sizes are approximately 0.45 micrometers.

7. A ceramic structure according to Claim 1 which further includes on said interior surface a coating of a glaze which absorbs radiation at said lasing wavelength.

8. A ceramic structure according to Claim 7 wherein said glaze comprises samarium oxide.

9. A ceramic structure according to Claim 2 wherein said packing density is about 85 percent.

10. A method for forming the ceramic structure of Claim 1 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 micrometers.

11. A method according to Claim 10 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.

12. A method according to Claim 11 wherein said glaze contains samarium oxide.

13. A method according to Claim 12 wherein said glaze is formed from a powdered glass comprising approximately 4-5 weight percent L ,0' 14-15 weight percent A1?0_,
33-34 weight percent Si02, 9-10 weight percent B20~,
14-15 weight percent SrO and 24-25 weight percent Sm„0_ .

14. A method according to Claim 13 wherein said glaze is formed to a thickness within the range of about 0.001 to 0.009 inches (0.0254 to 0.229 millimeters).

15. A method according to Claim 10 wherein said alumina is sintered for a sufficient time to form a sintered alumina ceramic body having grain sizes of approximately 0.45 micrometers.

16. A method according to Claim 10 wherein said alumina powder has a purity of at least 99.9 percent by weight .