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Method of heat-treating an oxide optical crystal and a heat treatment apparatus for carrying out the same

  • US 5,426,310 A
  • Filed: 06/01/1994
  • Issued: 06/20/1995
  • Est. Priority Date: 07/11/1989
  • Status: Expired due to Term
First Claim
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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, Ta2 O5 -TiO2, LiNbO3, MgO doped LiNbO3, KTiOPO4, KNbO3

  • -BaB2 O4, Y3 Al5 O12, LiB3 O5, TeO2, Ba2 NaNb5 O15, BaTiO3, 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°

    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.

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