高斯光束传播性质的数值模拟研究

Numerical simulations on the propagation properties of the Gaussian beam

基于平面波的角谱表示方法,给出高斯光束在非傍轴近似下的电场积分表达形式,数值模拟出高斯光束,并研究其在空气中的传播性质.主要讨论了高斯光束的光强度分布特点,波阵面、光斑尺寸的变化情况,以及束腰半径的大小对高斯光束的影响.通过对高斯光束的数值模拟,可以让学生对高斯光束建立一个更为形象而具体的物理图像,从而更深刻而细致地理解高斯光束.

Based on the angular spectrum representation method of plane waves,the Gaussian beam generated by lasers is simulated to study the propagation properties in the air.Discussed the optical intensity distribution,the wave front,the optical spot size and the collimating region of the Gaussian beam during its propagation.The waist of the Gaussian beam is also discussed to demonstrate its effects on the Gaussian beam.Via the numerical simulation of the Gaussian beam,hope most students can obtain a more concrete physical diagram of the Gaussian beam and deeply understand the Gaussian beam.