Growth of a Gradient-Doped Single-Crystal Rod with Designable Distribution of Doped Ions by a Laser-Heated Pedestal Growth Method
Growth of a Gradient-Doped Single-Crystal Rod with Designable Distribution of Doped Ions by a Laser-Heated Pedestal Growth Method
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DOI：
10.1021/acs.cgd.2c01344
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
Yun Dai;Jiahao Dong;Zhen Zhang;Zhonghan Zhang;H. Kou;L. Su;Jie Liu;Jinyun Gao;R. Dou;Qingli Zhang;Anhua Wu
中科院分区：
文献类型：
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作者：
Yun Dai;Jiahao Dong;Zhen Zhang;Zhonghan Zhang;H. Kou;L. Su;Jie Liu;Jinyun Gao;R. Dou;Qingli Zhang;Anhua Wu
二极管泵浦固体激光器的热效应主要由热分布不均匀引起，是限制激光器输出功率的重要瓶颈。在这项工作中，一种新的策略，合成YAG晶体薄棒与可设计的轴向掺杂剂梯度的基础上，激光加热基座生长（LHPG）的方法。为了使泵浦光均匀地被整个棒吸收，从理论上推导出了沿单晶棒（SCR）轴向沿着的最佳掺杂浓度分布。有限元模拟结果表明，Nd：YAG晶体细棒与设计的掺杂剂梯度，可以显着降低激光工作时的热负荷。利用生长的梯度掺杂半导体晶体作为增益介质，获得了激光二极管泵浦的波长为1.06 μm的连续激光输出，最大斜率效率为44%，最大输出功率为6.46 W。在相同条件下，均匀掺杂SCR的斜率效率为38.7%，最大输出功率为4.95W。结果表明，采用梯度掺杂的SCR具有较好的热管理和上级激光性能。该方法为实现晶体生长过程中掺杂离子的可控分布提供了新的思路。
The thermal effect of a diode pumped solid-state laser mainly caused by nonuniform thermal distribution is the significant bottleneck limiting the output power achievable. In this work, a novel strategy to synthesize YAG crystal thin rods with a designable axial dopant gradient based on the laser-heated pedestal growth (LHPG) method was developed. To make the pump light uniformly absorbed through the whole rod, the optimal doping concentration profile along the axis of single-crystal rods (SCRs) was theoretically deduced. Finite element simulation results demonstrated that the Nd:YAG crystal thin rods with a designed dopant gradient can significantly reduce heat loads under laser operation. Using the grown gradient doped SCRs as a gain medium, the laser diode pumped continuous-wave laser at ∼1.06 μm was achieved with the highest slope efficiency of 44% and a maximum output power of 6.46 W. Under the same conditions, the slope efficiency of the uniformly doped SCRs was 38.7% and the maximum output power was 4.95 W. The results show that the SCRs with gradient dopants possess better thermal management and superior laser performance. Significantly, this method also provides a new idea for realizing the controllable distribution of doped ions in crystal growth.