Claims
- 1. A method for preparing an oxide optical material having light absorption characteristics, said method comprising forming an oxide optical material, said optical material being selected from a group consisting of magnetic garnet, Ta.sub.2 O.sub.5 -TiO.sub.2, LiNbO.sub.3, MgO doped LiNbO.sub.3, KTiOPO.sub.4, KNbO.sub.3,.beta.-BaB.sub.2 O.sub.4, Y.sub.3 Al.sub.5 O.sub.12, LiB.sub.3 O.sub.5, TeO.sub.2, Ba.sub.2 NaNb.sub.5 O.sub.15, BaTiO.sub.3, and ZnO, and then improving the light absorption characteristics of the oxide optical material by heating the oxide optical material at a temperature in a range of to 700.degree. C. in an atmosphere having an ozone concentration in a range of 0.001% to 20% by volume to reduce the oxygen vacancies of the material.
- 2. A method according to claim 1, which includes coating the oxide optical material with a protective film before the material is subjected to the heating.
- 3. A method according to claim 1, wherein the oxide optical material is used for forming a substrate of an optical waveguide device.
- 4. A method according to claim 1, wherein the oxide optical material is used for forming an optical waveguide of an optical waveguide device.
- 5. A method according to claim 1, wherein the magnetic garnet is a Bi-substituted magnetic garnet.
- 6. A method for preparing an oxide optical material having light absorption characteristics, said method comprising forming an oxide optical material, said optical material being selected from a group consisting of magnetic garnet, Ta.sub.2 O.sub.5 -TiO.sub.2, LiNbO.sub.3, MgO doped LiNbO.sub.3, KTiOPO.sub.4, KNbO.sub.3,.beta.-BaB.sub.2 O.sub.4, Y.sub.3 Al.sub.5 O.sub.12, LiB.sub.3 O.sub.5, TeO.sub.2, Ba.sub.2 NaNb.sub.5 O.sub.15, BaTiO.sub.3, and ZnO, and then improving the light absorption characteristics of the oxide optical material by heating the oxide optical material at a temperature in a range of 350.degree. to 700.degree. C. in an atmosphere having an ozone concentration in a range of 0.001% to 20% by volume.
- 7. A method according to claim 6, which includes coating the oxide optical material with a protective film before the material is subjected to the heating.
- 8. A method according to claim 7, wherein the protective film is an oxide film.
- 9. A method according to claim 6, wherein the oxide optical material is used for forming a substrate of an optical waveguide device.
- 10. A method according to claim 6, wherein the oxide optical material is used for forming an optical waveguide of an optical waveguide device.
- 11. A method according to claim 6, wherein the magnetic garnet is a Bi-substituted magnetic garnet.
- 12. A method of heat-treating an oxide optical crystal according to claim 2, wherein the protective film is an oxide film.
Priority Claims (4)
Number |
Date |
Country |
Kind |
1-178586 |
Jul 1989 |
JPX |
|
1-179655 |
Jul 1989 |
JPX |
|
1-179656 |
Jul 1989 |
JPX |
|
1-339234 |
Dec 1989 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 08/048,943, filed Apr. 20, 1993, now abandoned, which was a continuation of U.S. Ser. No. 07/550,689, filed Jul. 10, 1990, now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2450885 |
Oct 1980 |
FRX |
Non-Patent Literature Citations (1)
Entry |
Tamada et al "TM-TE optical-mode conversion induced by a transversely propagating magnetostatic wave in a (BiLu).sub.3 Fe.sub.5 O.sub.12 film", J. Appl. Phys vol. 64, No. 2, 15 Jul. 1988, pp. 554-559. |
Continuations (2)
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Number |
Date |
Country |
Parent |
48943 |
Apr 1993 |
|
Parent |
550689 |
Jul 1990 |
|