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 arrays (LDA) is set up. LDA fast axis is upright to disk surface and is compressed. The distribution of pump and temperature and thermal stress in the thin disk are calculated by a finite element method. The influence disciplinarian of the pump power and heat transfer coefficient and time on distributions of temperature and thermal stress in the thin disk are analyzed. Results of simulation indicate that thermal extendable destroy appear on the edge of the composite surface. The change of the rise time and renew time of the temperature and stress is not obvious as the pumping power increase. And along the increase of the heat transfer coefficient, the temperature and stress and rise time and renew time decrease, but the rate of the change decrease to zero slowly. The steady temperature and thermal stress of temperature correlation of the thermodynamic parameters are bigger than that of the constant thermodynamic parameters. The theoretical results accord with interrelated experiment results．