受限拉盖尔-高斯光束湍流传输时轴上光强分布

为了研究受限拉盖尔-高斯光束湍流传输时轴上光强分布,采用扩展惠更斯-菲涅耳原理方法进行了理论分析,得到了受发射圆孔限制的拉盖尔-高斯光束在大气湍流中传输时轴上光强的表达式。并运用MAPLE模拟,取得了不同湍流强度、波长和发射圆孔孔径下轴上光强的分布理论数据。结果表明,拉盖尔-高斯光束在不同阶数、湍流强度、波长和发射圆孔孔径下,真空和湍流较弱时,轴上光强在近场发生明显振荡,达到最大值后,强度明显开始降低,湍流较强时,传输很近距离强度就迅速衰减,并与其在真空中的传输特性进行了比较。这一结果对研究拉盖尔一高斯光束是有帮助的。

Simulation of axial beam intensity distribution of limited Laguerre-Gaussian beams in atmospheric turbulences

From Huygens-Fresnel principle, the axial light intensity distributions of the Laguerre-Gaussian beams limited by a circular aperture in atmospheric turbulence were exported and the propagation characteristics under different intensity of turbulence and wavelength and aperture transmit were simulated used by MAPLE. The results indicate the oscillation rises in the near-field, its amplitude reduces with the increase of the turbulence intensity and transmitting aperture, the oscillation dies out and the average intensity declines smooth with the increase of propagation distance in far-field. The position of the last maximum value of average intensity is accordance with the intensity of turbulence and the circular aperture, as the turbulence is smaller, it changes smaller, the circular aperture is larger, the position of it is further. the intensity distributions of axial is also accordance with the rank and wavelength of the beams, it is higher as the wavelength or the rank of the beam is larger.