YAGレーザー照射によるサマリウムービスマスーホウ酸塩ガラスでの光非線形結晶ドット及びラインパターニング(<特集>セラミックスインテグレーション)

概要

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New transparent surface crystallized glasses in the system of Sm_2O_3-Bi_2O_3-B_2O_3 have been successfully fabricated. The second harmonic generation (SHG) from the crystalline phase at the surface layers has been confirmed from Maker fringe measurements. The chemical composition of optical nonlinear crystals in the crystallized glass of 12.5Sm2_O3 30Bi_2O_3 57.5B_2O_3 is determined to be Bi_<0.7>Sm_<0.3>BO_3. The irradiation of a continuous-wave YAG laser with a wavelength of 1064 nm induces sharp refractive-index changes or crystalline dot formation, depending on Sm_2O_3 content in the glasses and laser irradiation condition. In 10Sm_2O_3 30Bi_2O_3 60B_2O_3 glass, refractive-index changes (not crystallites) are induced by laser irradiations (power:1 W, time: 1-250 s), and spherical spots with 2-45 μm are formed. In 12.5Sm_2O_3・30Bi_2O_3・57.5B_2O_3 and 16.5Sm_2O_3 26Bi_2O_3 57.5B_2O_3 glasses, crystalline dots with diameters of 5-65 μm are formed by laser irradia-tions (power: 0.5-0.7 W, times: 1-250 s). The lines consisting of refractive-index changes and crystallites are fabricated by scanning laser spots with the speeds of 5-25 μms・s^<-1> It is found that the crystalline phase formed by laser irradiation is the same as that precipitated by usual heat treatment in an electric furnace and thus the crystalline dots and lines generate optical second harmonic waves.
社団法人日本セラミックス協会の論文
2002-05-01