Czochralski 법으로 성장된 Yb 3+ doped Y3Al5O12 단결정의 성장 분위기 및 도핑농도에 따른 광학적 특성
Optical properties of Yb 3+ doped Y3Al5O12 single crystals derived by the Czochralski method according to growth atmosphere and doping concentration
0
조회
0
다운로드
1
인용
0
참고문헌
초록
Yb 3+ 이온이 25 at.%까지 치환된 Y3Al5O12 단결정을 Czochralski 법으로 성장시켰다. 0.8 mm/h의 인상속도와10 rpm의 회전 속도로 40 mm의 결정 직경과 160 mm의 결정 길이를 가진 단결정을 얻었다. 결정 성장 분위기는 순수한 질소 혹은 질소와 산소를 혼합한 가스 분위기였다. 순수한 질소 분위기에서는 청록색을 띤 결정이 성장되었고 99 %의 질소와1 %의 산소를 혼합한 가스 분위기에서 성장한 결정은 무색이었다. 농도 분석결과를 보면, 결정의 길이가 길어짐에 따라Yb 3+의 농도는 감소하고, core 영역의 Yb 3+ 농도는 core 없는 영역보다 다소 높게 검출되었다. Yb 3+ 이온의 도핑 농도가 증가함에 따라 형광 수명은 감소하였다.
Abstract
Single crystals of Yb 3+ doped Y3Al5O12 up to 25 at.% were grown by the Czochralski method. Using the pulling rate of 0.8 mm/h and the rotation rate of 10 rpm, single crystals with diameters of up to 40 mm and lengths up to 160 mm were obtained. The growth atmosphere was either pure nitrogen or the mixture of nitrogen and oxygen. The crystal was bluish green when using pure nitrogen and the crystal was colorless when using the mixture of 99 % nitrogen and 1 % oxygen. The concentration of Yb 3+ ions decreased with increasing the length of the crystal and Yb 3+ concentration of core area was slightly higher than the other areas in the compositional analysis. The fluorescence lifetime decreased with increasing the doping concentration of Yb 3+ ions.
참고문헌 (11)
- T.Y. Fan, "Heat generation in Nd : YAG and Yb : YAG", IEEE J. Quantum Electron, 29, pp.1457~ (1993)
- W.F. Krupke, "New laser materials for diode pumped solid state lasers", Science, 4, pp.197~ (1999)
- P. Yang, "Growth of highquality single crystal of 30 at.% Yb : YAG and its laser performance", J. Crystal Growth, 216, pp.348~ (2000)
- H. Yin, "Defects in YAG : Yb crystals", J. Appl. Phys, 83, pp.3825~ (1998)
- P. Lacovara, "Room-temperature diode-pumped Yb : YAG laser", Opt. Lett, 16, pp.1089~ (1991)
- R.D. Shannon, "Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides", Acta Cryst, A32, pp.751~ (1976)
- Cz. Janusz, "Disclosure of defects in YAG : Nd crystals by thermoluminescence method", J. Crystal Growth, 57, pp.593~ (1982)
- X. Xu, "Distribution of ytterbium in Yb : YAG crystals and lattice parameters of the crystals", J. Crystal Growth, 255, pp.338~ (2003)
- K. Kitamura, "Origin of difference in lattice spacings between onand off-facet regions of rare-earth garnets grown from the melt", J. Crystal Growth, 64, pp.207~ (1983)
- D. S. McClure, "Survey of the Spectra of the Divalent Rare?Earth Ions in Cubic Crystals", J. Chem. Phys, 39, pp.3251~ (1963)
- P. Yang, "Concentration quenching in Yb : YAG", J. Lumin, 97, pp.51~ (2002)