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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。
Aiming at the thermal effect of Yb: YAG crystal produced by laser diode end pumped wafer, the thermal effect is analyzed by the theory of heat conduction based on the actual working characteristics. The influence of different pumping powers, super-Gaussian order, spot radius and crystal size on the temperature field of Yb: YAG crystal was investigated. The results show that the Yb: YAG Yb: YAG crystal with a mass fraction of 8%, a crystal radius of 4 mm and a thickness of 0.5 mm is obtained using a pump light with a pumping power of 60 W, a super Gaussian order of 5 and a spot radius of 400 μm When the thermal conductivity of the crystal is regarded as a constant and a variable respectively, the maximum temperature rise of the pump end face is 52.15 ° C and 59.51 ° C, respectively. According to the calculation results, a suitable laser stable cavity is designed, which can fully suppress the thermal effect caused by the laser.