大气湍流中受限高斯光束的轴向光强分布

利用扩展Huygens-Fresnel原理分析了大气湍流中圆形孔径限制下高斯光束的传播特性,得到了轴上平均光强的解析表达式,运用数值模拟方法计算了不同湍流强度、孔径大小和波长下的轴上平均光强.结果表明,轴上平均光强在近场发生振荡,其振荡幅度随湍流强度增强和发射孔径的增大而降低,振荡的周期随传播距离的增大而增加;在远场随传播距离的增大,振荡逐渐消失,平均光强平滑下降,最后一个平均光强极大值的位置与湍流强度和波长成反比,与发射孔径成正比.

Axial light intensity distribution of limited Gaussian beams in atmospheric turbulence

Using extended Huygens-Fresnel principle,the propagation characteristics of the Gaussian beams limited by a circular aperture in atmospheric turbulence are analyzed,and the analytical expression of average intensity on axis is derived.Through the numerical simulation, the average intensity on axis is calculated with different turbulence intensity,aperture size and wavelength.The results shows that the oscillation rises in the near-field,its amplitude reduces with the increase of the turbulence intensity and transmitting aperture,and its period rises with the increase of propagation distance.In far-field,the bscillation dies out and the average intensity declines smooth with the increase of propagation distance,the position of the last maximum value of average intensity is in direct proportion to the turbulence intensity and wavelength,and is in inverse proportion to the transmitting aperture.