采用数值计算方法分析了较高能量密度激光在光束控制系统内所产生的热效应对远场光斑质量和能量分布的影响。激光传输由近轴波方程描述 ,采用像屏法和快速傅里叶变换技术求解。激光加热引起的气流扰动及气体介质密度变化采用完全的Navier Stokes方程描述 ,以便考虑各种不同因素的影响。Navier Stokes方程求解采用LU SGS分解技术。数值计算结果表明 ,在典型情况下 ,热晕引起的附加热相位会明显增大发射激光的发散 ,降低目标处激光能量集中度和远场光斑质量。这一方法还可扩展应用于其他气动光学问题研究 The influence of the thermal effect generated by the higher energy density laser in the beam control system on the mass and energy distribution of the far field spot is analyzed numerically. Laser transmission is described by the paraxial wave equation, using image-like methods and fast Fourier transform techniques. The turbulence of the gas flow caused by the laser heating and the change of the density of the gas medium are described by a complete Navier Stokes equation in order to consider the influence of various factors. Navier Stokes equations are solved using LU SGS decomposition technique. The numerical results show that under typical conditions, the additional thermal phase caused by thermal halo significantly increases the divergence of the emitted laser and reduces the laser energy concentration and the quality of the far-field spot at the target. This method can also be extended to other aerodynamic optical problems