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J. Korean Ceram. Soc. > Volume 36(12); 1999 > Article
Journal of the Korean Ceramic Society 1999;36(12): 1374.
Poling된 실리카 유리의 2차비선형광학효과와 공간전하분극의 관계
신동욱
한양대학교 세라믹공정연구센터 무기재료공학과
Induced Second Order Optical Nonlinearity in Thermally Poled Silica Glasses
ABSTRACT
The cause of Scond Harmonic Generation (SHG) in thermally poled silica glass is suggested basedon the electrical and dielectric relaxation measurements. The absorption currents as functions of time were measured for various types of silica glasses and analyzed by the theory of Space Charge Polarization. Space charge polarization occurs when an ionic conducting material is subjected to dc electric field with blocking electrode. Thermal poling performed to induce SHG in silica glass is basically identical to the process generating space charge polarization. Hence it was found that gene-ration removal reproduction and temperature dependence of SHG in poled silica is directly related to those of space charge polarization. It turned out that the fundamental parameters governing the SHG in poled silica are charge carrier concentration and mobility. Based on the theory of space charge polarization and experimental results of electrical rela-xation the method to increase the intensity of SHG is proposed.
Key words: Silica, Poling, SHG, Electro-optic, Polarization, Relaxation
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