激光与光电子学进展, 2013, 50 (12): 121405, 网络出版: 2013-11-13
半高斯激光束在自由空间的传输特性理论研究
Theoretical Study on Propagation Properties of Semi-Gaussian Laser Beam
摘要
基于惠更斯菲涅耳衍射积分理论,对半高斯激光束在自由空间的传输特性进行了详细的理论研究,得到了二维半高斯激光束在自由空间传输时的光强分布计算表达式。数值计算结果表明半高斯激光束在自由空间传输时,在近场有很好的传输稳定性,当传输距离继续增大时,半高斯激光束的最大光强值不断降低,衍射条纹逐渐增多,同时上升沿宽度慢慢展宽,最后在远场转化为对称性光束。数值计算结果还发现对称性越好的半高斯激光束其传输稳定性越好。
Abstract
Based on the Huygens-Fresnel diffraction integral theory, the propagating properties of semi-Gaussian laser beams in free space are theoretically calculated in detail. Analytical propagation equations are derived, which permit us to study the intensity distributions of two-dimensional (2D) semi-Gaussian laser beams propagating in free space. The calculated results show that the propagation stability of semi-Gaussian laser beams in free space can be maintained well in the near field. As the propagation distance increases, the maximum intensities of the propagating laser beams decrease while the diffraction fringes gradually increase. At the same time, the width of the rising edge gradually grows. Finally semi-Gaussian laser beams become symmetrical beams. The better the symmetry is, the better propagation stability of semi-Gaussian laser beams will be.
郭超修, 凌晨, 杜向丽, 尹亚玲. 半高斯激光束在自由空间的传输特性理论研究[J]. 激光与光电子学进展, 2013, 50(12): 121405. Guo Chaoxiu, Ling Chen, Du Xiangli, Yin Yaling. Theoretical Study on Propagation Properties of Semi-Gaussian Laser Beam[J]. Laser & Optoelectronics Progress, 2013, 50(12): 121405.