Spectral study and energy transfer analysis of Er:YAlO3 crystals
Spectral study and energy transfer analysis of Er:YAlO3 crystals
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DOI：
10.1016/j.jlumin.2023.120042
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发表时间：
2023
影响因子：
3.6
通讯作者：
Xu Wu;Zhen Zhang;Yun Dai;Yunfei Wang;Xibin Wang;Zhonghan Zhang;D. Sun;L. Su;Anhua Wu
中科院分区：
文献类型：
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作者：
Xu Wu;Zhen Zhang;Yun Dai;Yunfei Wang;Xibin Wang;Zhonghan Zhang;D. Sun;L. Su;Anhua Wu
Er：雅普晶体是一种很有前途的中红外增益材料，但对Er：YAP晶体的掺杂浓度与光谱性能的关系还没有系统的研究。在本工作中，Er：雅普晶体具有一系列掺杂浓度（0.1at.%，1原子%，5原子%，10原子%，15原子%，30原子%）采用改进的激光加热基座生长（LHPG）方法，成功地快速生长出了200 μ m的纳米晶。通过详细研究掺杂浓度对光谱特性的影响，发现当掺杂浓度低于5at.%时，交叉弛豫过程（Er 3+：4S 3/2+ 4 I 15/2→ 4 I 9/2+ 4 I 13/2）随掺杂浓度的增加而显著增强，并最终趋于饱和。当掺杂浓度为5at.%时，有利于获得高效率的103 μm激光的合作上转换过程（Er 3+：4 I13/2 + 4 I13/2→ 4 I15/2+ 4 I9/2）开始占主导地位这一结果表明，Er：雅普晶体在较低掺铒浓度下具有获得高功率、高效率激光输出的潜力，并为Er：雅普系统的掺杂优化提供了有价值的指导。
Er:YAP crystals have been proved promising mid-infrared gain materials but there is few systematic study focused on the relationship between the doping concentration and spectral properties. In this work, Er:YAP crystals with a series of doping concentrations(0.1 at.%, 1 at.%, 5 at.%, 10 at.%, 15 at.%, 30 at.%) were fast grown successfully by a modified laser-heated pedestal growth (LHPG) method. Through investigating doping concentration dependent spectral characteristics in detail, we found that the cross relaxation process (Er3+:4S3/2+4I15/2→4I9/2+4I13/2) gets significantly enhanced with the doping concentration when it is below 5 at.%, and eventually tends to saturate. And the cooperative up-conversion process (Er3+:4I13/2+4I13/2→4I15/2+4I9/2) conducive to high-efficiency ∼3 μm laser starts to dominate when the doping concentration is 5 at.% or even less. This result demonstrates the potential of Er:YAP crystals to achieve high-power and high-efficiency laser output under relatively low Er-doping concentration, and offers a valuable guidance for doping optimization of Er:YAP systems.