复合Nd∶YAG晶体固体激光器热效应研究
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吉林省教育厅“十三五”科学技术项目(JJKH20190552KJ)资助


Study on thermal effect of composite Nd∶YAG crystal solid state laser
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    摘要:

    通过使用Comsol有限元仿真软件中的热传导模块,对以下四种晶体在端面泵浦工作情况下晶体内部温度分布进行了模拟分析。其中包含:(1)3 mm×3 mm×10 mm均匀掺杂Nd∶YAG晶体;(2)两个端面分别键合3 mm长YAG晶体的3 mm×3 mm×10 mm Nd∶YAG复合晶体;(3)侧面键合厚度1 mm的YAG晶体5 mm×5 mm×10 mm 复合Nd∶YAG晶体;(4)四个侧面分别键合厚度1 mm的YAG晶体,两个端面分别键合3 mm长的YAG晶体的5 mm×5 mm×10 mm Nd∶YAG晶体。在泵浦功率为30 W时,四种晶体的最高工作温度分别为153 ℃,114 ℃,157 ℃,115 ℃。结果表明,与侧面键合结构相比,端面键合是降低激光晶体的工作温度,减小热效应的有效方法。为研究侧面键合结构的适用条件,论文降低了晶体侧面的导热系数,模拟了在同样的泵浦功率条件下四种晶体的最高温度,分别为212.014 ℃,149.158 ℃,186.741 ℃和134.410 ℃。模拟结果表明在侧面散热条件比较差的条件下,侧面与端面双重键合是降低激光晶体热效应的最佳选择。在实验方面,采用LDA作为泵浦源,在泵浦功率为18 W时,得到侧面与端面双重键合的Nd∶YAG的输出功率最高,为12.1 W,转换效率为67.2 %,实验结果与理论模拟结果相符合。

    Abstract:

    The temperature distribution inside the following four crystals under the working condition of end pump is simulated by using the heat conduction module in the Comsol software.The four crystals are respectively:(1)3 mm×3 mm×10 mm uniformly doped Nd∶YAG crystal;(2)3 mm×3 mm×10 mm Nd∶YAG composite crystal with 3 mm long YAG crystal bonded to two end faces;(3) 5 mm×5 mm×10 mm composite Nd∶YAG crystal with YAG crystals whose thickness is 1 mm bonded to the side;(4)5 mm×5 mm×10 mm Nd∶YAG crystal with YAG crystals whose thickness is 1 mm bonded to each of the four sides and with 3 mm long YAG crystals bonded to each of the two end faces.When the pump power is 30 W,the maximum operating temperatures of the four crystals are 153 ℃,114 ℃,157 ℃ and 115 ℃,respectively.The results show that compared with the side bonding structure,end face bonding is an effective method to reduce the operating temperature of the laser crystal and the thermal effect.In order to study the applicable conditions of the side bonding structure,the thermal conductivity of the crystal side is reduced,and under the condition of the same pump power,the maximum temperatures of the four crystals is simulated,which are 212.014 ℃,149.158 ℃,186.741 ℃and 134.410 ℃,respectively.The simulation results show that under the condition of poor heat dissipation on the side,the double bonding of the side and the end face is the best choice to reduce the thermal effect of the laser crystal.In the case of the pump power of 18W,the Nd∶YAG crystal with the YAG crystals bonded to each of sides and end faces experimentally have the highest output power of 12.1 W for the LDA pump source.The conversion efficiency can reach 67.2 %.The experimental results are consistent with the simulation results.

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李萌萌,杨飞,赵上龙,高兰兰.复合Nd∶YAG晶体固体激光器热效应研究[J].激光与红外,2020,50(1):42~48

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  • 在线发布日期: 2020-02-13
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