Laser-induced line patterning of nonlinear optical β'-Sm[x]Gd[2-x](MoO4)3 molybdate crystals in glass (特集光機能材料)

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Glasses in the system of Sm2O3-Gd2O3-MoO3-B2O3-BaO are prepared, and structural changes are induced by irradiations of continuous wave Nd: YAG laser with a wavelength of λ=1064 nm. The optical absorption coefficient of Sm3+ ions at λ=1064 nm in the glasses is found to increase linearly with increasing Sm2O3 contents, and it is clarified that the Sm2O3 content in the glasses must be at least more than 6 mol% in order to induce crystallization under laser irradiations with powers less than P=1 W. The lines patterned by laser irradiations with P=0.8 W and a scanning speed of S=2.5 μm/s consist of a mixture of paraelectric α-SmxGd2-x(MoO4)3 and nonlinear optical β-SmxGd2-x(MoO4)3 crystals. The formation of only β-SmxGd2-x(MoO4)3 crystals is confirmed in the lines patterned at P=0.83 W. Although the addition of BaO increases largely the thermal stability against crystallization, the line patterning behavior is not affected significantly at least in the present laser irradiation conditions.
社団法人粉体粉末冶金協会の論文
2008-03-15