Er 3+ doped Y3Al5O12 단결정의 core 영역 및 광학적 특성
Core region and optical properties of Er 3+ doped Y3Al5O12 single crystals
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초록
Er 3+ 이온이 5, 7.3, 8, 10 at.% 치환된 Y3Al5O12 단결정을 Czochralski법으로 질소 분위기에서 성장시켰다. 1.0 mm/h의 인상속도와 10 rpm의 회전 속도로 50 mm의 결정 직경을 가진 <111> 방향의 Er : Y3Al5O12 단결정을 얻었다. 두꺼운 직경의 core 영역은 주로 결정 성장 중 직경 변화가 있는 영역에서 발생되었다. 결정 내에서 Er 3+의 농도는 융액 내의농도와 같았다. Core 영역의 Er 3+ 농도는 core가 없는 영역보다 다소 높게 검출되었다. Er 3+ 이온의 도핑 농도가 증가함에따라 형광 수명은 포화되었다.
Abstract
Er 3+ doped Y3Al5O12 (Er : YAG) single crystals, in which the concentrations of Er 3+ ion were 5, 7.3, 8, and 10 at.%, were grown by the Czochralski method under nitrogen atmosphere. The <111> oriented Er : YAG single crystals with diameters of up to 50 mm were grown at a pulling rate of 1.0 mm/h and rotation rate of 10 rpm. The thick part of the core region was generated mainly when there was a diameter change during the crystal growth. The concentrations of Er 3+ ion in the crystals were the same as it was in the melt. Er 3+ concentration of core region was slightly higher than the other regions in the compositional analysis. The fluorescence lifetime was saturated according to the increase of Er 3+ doping concentrations.
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