Micro-pulling down 법으로 성장시킨 Zn와 Yb를 첨가한 LiNbO3 단결정의 광 학적 특성
Crystal growth and optical properties of Zn and Yb co-doped LiNbO3 rod-shape single crystal by micro-pulling down method
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초록
Micro-pulling down(μ-PD)법을 이용하여 직경 2 mm, 길이 15~25 mm의 Zn와 Yb가 첨가된 near-stoichiometric 조성의 LiNbO3 단결정을 성장하였다. 일정 직경의 매끄럽고 결함이 없는 양질의 단결정임을 확인하였고, 결정 내 첨가된 Zn와 Yb의 조성이 고루 분포되었음을 알 수 있었다. Raman spectra를 통해 나타난 모든 peak은 LiNbO3 powder의 peak과 일치함을 알 수 있었고, 이를 통해 Hexagonal 구조의 LiNbO3가 성장되었음을 확인할 수 있었다. Zn의 첨가량 증가에 따른 IR 영역의 투과도 비교를 통해 광손상을 억제에 효과가 있는 Zn 첨가의 역치량이 1 mol%임을 알 수 있었다.
Abstract
Yb and Zn co-doped LiNbO3 single crystal rods which had a diameter of 2 mm and a length of 15~25 mm were grown by micro-pulling down (μ-PD) method. The single crystals were successfully grown and had a uniform diameter and a smooth surface without crack. We realized of LiNbO3 single crystals were hexagonal structure to compare with peaks of LiNbO3 powder by Raman spectra. The threshold level of Zn concentration which is effective for optical damage were observed as about 1 mol% with IR transmission spectra.
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