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建立了激光二极管阵列(LDA)端面抽运棒状激光介质的数值模型.考虑到介质与空气的对流换热和介质的热力学参数随温度的变化,根据经典热传导方程和热弹性方程,运用有限元法得出了复合棒状介质和未复合棒状介质内瞬态温度、热应力和应变的时空分布,分析了温度、热应力和应变随抽运功率、换热系数和时间的变化规律.结果表明,复合棒的最高温度、最大张应力和最大轴向应变的位置与未复合棒不同,并且数值分别为未复合棒的73%,60%和33%.由此可知,利用复合棒可极大地减小热效应的影响.理论分析结果可为LDA抽运固体激光器的结构优化设计和实验研究提供理论参考.
A numerical model of laser diode array (LDA) end-face pumping rod laser is established. Considering the convection heat transfer between medium and air and the change of the thermodynamic parameters of the medium with temperature, according to the classical heat conduction equation and thermoelastic equation, The temporal and spatial distributions of transient temperature, thermal stress and strain in composite rod-shaped media and non-composite rod-shaped media are obtained, and the variation laws of temperature, thermal stress and strain with the pumping power, heat transfer coefficient and time are analyzed.The results show that the composite The locations of the maximum temperature, the maximum tensile stress and the maximum axial strain of the rods are different from those of the uncoated rods, and the values are respectively 73%, 60% and 33% of the uncoiled rods, which shows that the utilization of the composite rods can be greatly reduced Thermal effect.The theoretical analysis can provide theoretical reference for the structural optimization design and experimental study of LDA pumped solid-state laser.