J. Korean Ceram. Soc. > Volume 33(5); 1996 > Article
 Journal of the Korean Ceramic Society 1996;33(5): 507.
 $TeO_2-PbO-GeO_2$계 유리 내 비선셩 광학 특성의 구조 의존성 김원효, 허종, 김유성1, 류선윤2 포항공과대학교 재료금속공학과 비정질 무기재료연구실1포항공과대학교 재료금속공학과 비정질 무기재료연구2선문대학교 재료공학과 Structural Dependence of Nonlinear Optical Properties in $TeO_2-PbO-GeO_2$ ABSTRACT Nonlinear optical properties of TeO2-PbO-GeO2 glasses were investigated and their correlation with struc-tural modification was investigated. Third-order nonlinear susceptibility $chi$, ranged between 5.0$times$10-13 esu and 10.7$times$10-13 esu which are approximately 20-40 times larger than that of silica glass. The glass with a composition of 85(80TeO2-20PbO)-15GeO2(mol%) seemed to provide an optimum compromise between $chi$and the stability against crystallization. Analyses of the Raman spectra suggested that these glasses are mainly composed of [TeO4] tbp, [TeO3]tp and [GeO4] tetrahedral structural units. It was concluded that the positive contribution of Pb2+ with high polarizability to $chi$ in TeO2-PbO glasses overwhelmed the negative influence due to the structural modification of [TeO4]tbplongrightarrow[TeO3]tp. On the other hand addition of GeO2 in TeO2-PbO-GeO2 glasses resulted in the decrease of $chi$ values. This behavior was attributed to the formation of [GeO4] polyhedra at the expense of [TeOn] polyhedra and Pb2+ ions which normally sowed a higher contribu-tion to $chi$ than [GeO4] polyhedra. Key words: Nonlinear optical properties, Third harmonic generation, Raman spectra, Tellurite glasses
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