μ-PD 법으로 성장시킨 near-stoichiometric 조성 Zn : LiNbO3 fiber 단결정 성장 및 광손상 특성
Crystal growth and optical properties of near-stoichiometric Zn : LiNbO3 fiber single crystal by μ-PD method
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초록
Micro-pulling down(m-PD)법을 이용하여 직경 0.8~1.0 mm, 길이 30~35 mm의 ZnO가 첨가된 near-stoichiometric LiNbO3 단결정을 성장하였다. 성장된 결정의 결정구조를 powder x-ray diffraction(XRD) patterns으로 확인하였고, electron probe micro analysis(EPMA)를 이용하여 결정내 Zn 이온들이 균일하게 분포되었음을 확인하였다. 또한 2 mol% 이상의 ZnO 첨가시 OH- 흡수밴드의 특성이 크게 변화함을 관찰함으로써 ZnO 첨가량에 일치한 역치(threshold)가 존재함을 확인하였다.
Abstract
ZnO-doped near-stoichiometric LiNbO3 single crystals of 0.8~1.0 mm diameter and 30~35 mm length were grown by the micro-pulling down (m-PD) method. The structure of the grown crystals was confirmed by powder x-ray diffraction (XRD) patterns. Electron probe micro analysis (EPMA) showed that Zn ions were homogeneously incorporated in grown crystals. The threshold in ZnO doping level was confirmed that an abrupt change in the features of OH- absorption band as doping level reaching about 2 mol%.
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