Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Structural Dependence of Nonlinear Optical Properties in $TeO_2-PbO-GeO_2$

$TeO_2-PbO-GeO_2$계 유리 내 비선셩 광학 특성의 구조 의존성

  • Kim, Weon-Hyo (Non-Crystalline Mater. Laboratory, Dept. of Mater. Sci. and Eng., Pohang Univ. of Sci. and Tech) ;
  • Heo, Jong (Non-Crystalline Mater. Laboratory, Dept. of Mater. Sci. and Eng., Pohang Univ. of Sci. and Tech) ;
  • Kim, You-Song (Non-Crystalline Mater. Laboratory, Dept. of Mater. Sci. and Eng., Pohang Univ. of Sci. and Tech) ;
  • Ryou, Sun-Youn (Dept. of Mater. Sci. and Eng., Sun-Moon Univ)
  • 김원효 (포항공과대학교 재료금속공학과 비정질 무기재료연구실) ;
  • 허종 (포항공과대학교 재료금속공학과 비정질 무기재료연구실) ;
  • 김유성 (포항공과대학교 재료금속공학과 비정질 무기재료연구) ;
  • 류선윤 (선문대학교 재료공학과)
  • Published : 1996.05.01
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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.

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