Preparation of a transparent alumina film doped with CdS and its nonlinear optical properties |
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Authors: | Y. Kobayashi S. Yamazaki Y. Kurokawa T. Miyakawa H. Kawaguchi |
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Affiliation: | (1) Faculty of Engineering, Tohoku University, Aramaki, 980 Sendai, Japan;(2) Faculty of Engineering, Yamagata University, 4-Johnan, 992 Yonezawa, Japan |
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Abstract: | We have examined the preparation of transparent alumina film and CdS-doped alumina film prepared by the sol-gel process using aqueous sol starting from AlCl3. The resulting alumina films obtained by sol-gel transformation are transparent in the visible and near infrared up to 1000 °C. Homogeneous solution of alumina sol and Cd(CH3COO)2 was converted into gel film by dehydration. Then, on exposure to H2S stream at 250–600 °C, a CdS-doped film was obtained. It shows relatively sharp blue-shifted visible absorption that is attributed to size quantization effect. Large nonlinear absorption and refractive index have been obtained, because high concentration of CdS particles can be achieved by using this method. |
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