激光二极管阵列侧面泵浦薄片激光器的热效应

摘要

建立了激光二极管阵列快轴垂直于薄片表面、对快轴压缩、环绕侧面泵浦复合薄片激光器的数值模型.依据激光二极管阵列的输出光束特性,运用有限元法,得出了薄片内的泵浦光、温度和热应力分布.分析了温度和热应力与泵浦功率、换热系数和时间的变化规律.模拟结果表明:热破坏主要为复合面外侧的拉伸破裂;温度和应力的上升时间和恢复时间随泵浦功率的变化不明显,随换热系数的增大而减小,存在一个最佳的换热系数;考虑热力学参数温度相关性的稳态温度和应力要大于不考虑热力学参数温度相关性时的值.%A numerical model of the thin composite disk side-pumped by ring laser-diode array(LDA) is set up. The LDA fast axis is upright to the disk surface and is compressed. The distribution of the pump, temperature and thermal stress in the thin disk is calculated by a finite element method and the influence of pump power, heat transfer coefficient and time on the temperature and thermal stress is analyzed. Results of simulation indicate that thermal extendable destroy appears on the edge of the composite surface. The rise time and recovery time of the temperature and stress show no obvious change as the pump power increases, while they decrease along with the increase of the heat transfer coefficient. The steady temperature and thermal stress of temperature correlation considering the thermodynamic parameters are bigger than those of the constant thermodynamic parameters.The theoretical results accord with related experiment results.