Growth, structural, spectral and high-power continuous-wave laser operation of Yb0.11Gd0.89COB crystal
来源期刊：JOURNAL OF RARE EARTHS2017年第7期
论文作者：钟德高 滕冰 孔伟金 薛冬峰 孙丛婷 景贺琳 贺杰 徐雅琳 杨亮 唐捷
文章页码：637 - 644
摘 要：A Yb0.11Gd0.89Ca4O（BO3）3 crystal with new composition was grown by the Czochralski method. The crystal structure was measured and analyzed. The unit-cell parameters of the Yb0.11Gd0.89COB were calculated to be a=0.8089（7） nm, b=1.5987（6） nm, c=0.3545（8） nm, β=101.22o. The absorption and fluorescence spectra were measured. The maximum absorption cross-section of Yb0.11Gd0.89 COB crystal was 0.79×10–20cm2, which occurred at 976 nm with Y polarization. The emission cross-section at 1027 nm was calculated to be 0.33×10–20 cm2. The radiative lifetime trad was calculated to be 2.74 ms. The Stark energy-level diagram of Yb3+in the Yb0.11Gd0.89COB crystal field at room temperature was determined. The ground-state energy level 2F7/2 splitting was calculated to be as large as 1004 cm–1 and the zero-line energy was 10246 cm–1. A maximum output power of 9.35 W was achieved in continuous-wave（CW） mode, with the slope efficiency being 42.1%. Chemical etching experiment revealed that the dominating imperfections in the studied Yb0.11Gd0.89 COB crystal were dislocations and sub-grain boundaries. The existence of crystal defects could cause light scattering, and degrade laser output efficiency. The influence of crystal defects on laser properties was discussed.
钟德高1,2，滕冰1，孔伟金1，薛冬峰3，孙丛婷3，景贺琳1，贺杰1，徐雅琳1，杨亮1，唐捷1
1. College of Physics, Qingdao University2. Institute of Complexity Science, Qingdao University3. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
摘 要：A Yb0.11Gd0.89Ca4O（BO3）3 crystal with new composition was grown by the Czochralski method. The crystal structure was measured and analyzed. The unit-cell parameters of the Yb0.11Gd0.89COB were calculated to be a=0.8089（7） nm, b=1.5987（6） nm, c=0.3545（8） nm, β=101.22o. The absorption and fluorescence spectra were measured. The maximum absorption cross-section of Yb0.11Gd0.89 COB crystal was 0.79×10–20cm2, which occurred at 976 nm with Y polarization. The emission cross-section at 1027 nm was calculated to be 0.33×10–20 cm2. The radiative lifetime trad was calculated to be 2.74 ms. The Stark energy-level diagram of Yb3+in the Yb0.11Gd0.89COB crystal field at room temperature was determined. The ground-state energy level 2F7/2 splitting was calculated to be as large as 1004 cm–1 and the zero-line energy was 10246 cm–1. A maximum output power of 9.35 W was achieved in continuous-wave（CW） mode, with the slope efficiency being 42.1%. Chemical etching experiment revealed that the dominating imperfections in the studied Yb0.11Gd0.89 COB crystal were dislocations and sub-grain boundaries. The existence of crystal defects could cause light scattering, and degrade laser output efficiency. The influence of crystal defects on laser properties was discussed.
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