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数值模拟分析了大功率光子晶体光纤(PCF)激光器的温度场和热应力场。通过引入等效热传导率对光子晶体光纤结构进行简化,建立了光子晶体光纤激光器的三维温度场模型。利用有限元方法数值模拟得到了自然对流换热时光子晶体光纤中的温度场及光纤端面的热应力场,并对强制对流换热时光子晶体光纤的冷却效果进行了数值模拟分析。结果表明,对于选取的PCF,通过采取强制对流换热措施可以承受1000W的抽运功率而不会产生热效应损伤,如果需要通过提高抽运功率以获得更大功率的激光运转,则需要改变光纤的结构。
The temperature field and thermal stress field of high power photonic crystal fiber (PCF) laser are numerically simulated. By introducing the equivalent thermal conductivity of the photonic crystal fiber structure is simplified, the three-dimensional temperature field model of the photonic crystal fiber laser is established. The temperature field in the photonic crystal fiber with natural convection and the thermal stress field at the end face of the fiber are obtained by the numerical simulation of the finite element method. The numerical simulation of the cooling effect of the photonic crystal fiber during forced convection heat transfer is also given. The results show that for the selected PCF, the pumping power of 1000W can be absorbed by the forced convection heat transfer without thermal damage. If the pumping power needs to be increased for more powerful laser operation, it is necessary to change the fiber structure.