为了解决汇聚或发散光束衍射传输的数值仿真问题,研究了透镜成像的复振幅脉冲响应函数,提出了一种物像共轭变换方法。通过将发散或汇聚光波场中的球面波相位因子等效为一个透镜,利用透镜的脉冲响应函数和物像变换关系,将含球面波相位因子光束衍射传输数值模拟问题转化为不含球面波相位因子光束的衍射传输,解决了汇聚或发散光波场的衍射传输的数值仿真问题,具有简单高效,物理意义直观明显的优点。通过对一个方孔透镜组合的衍射传输问题实际例子的仿真计算,验证了该方法的实用性和有效性。

In order to numerically simulate the diffraction propagation of convergence/divergence optical beams, the complex amplitude pulse response function of lens imaging is researched. A novel method called object-image conjugation translation is presented, in which the spherical wave phase factor in convergence/divergence beams is equivalent to a lens, and the spherical wave phase factor is removed in the diffraction propagation with the pulse response function and the object-image translation. This idea is simple but efficient, with a visual physical meaning. The simulation of the diffraction propagation of the optical beam with square aperture-lens assembly, proves the practicality and the validity of the idea.