针对激光二极管端面泵浦圆片Yb∶YAG晶体产生的热效应问题, 以实际工作特点为基础, 通过热传导理论分析了热效应。分析了不同泵浦功率、超高斯阶次、光斑半径、晶体尺寸因素对变热导率圆片Yb∶YAG晶体温度场的影响。研究结果表明, 使用泵浦功率为60W、超高斯阶次为5、光斑半径为400μm的泵浦光对含质量分数为8%、晶体半径为4mm、厚度为0.5mm的圆片Yb∶YAG晶体进行泵浦, 在将晶体的热导率分别视为常量和变量时, 泵浦端面获得的最大温升分别为52.15℃和59.51℃。根据计算结果, 设计了适合的激光器热稳腔, 能充分抑制激光器产生的热效应问题。

In order to study the thermal effect of Yb∶YAG crystal end-pumped by pulse LD,thermal effect is analyzed by theory of heat conduction based on actual work characteristics. Different factors, such as the different pump power, super Gauss order, radius of spot, size of crystal, have different influences on variable thermal-conductivity Yb∶YAG circular crystal are analyzed systematically. The research results show that maximum temperature of Yb∶YAG crystal end pumped surface is 52.15 ℃ and 59.51℃ respectively under the different conditions that thermal-conductivity is constant and non-constant. And in that case, the 5 order super-Gaussian light is used,whose output power is 60W and radius of spot is 400μm to pump the crystal whose mass fraction is 8%, the radius is 4 mm and the thickness is 0.5mm. According to the results, the design of suitable laser heat resonator can effectively suppress the thermal effect.