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。
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.
出处
《激光与光电子学进展》
CSCD
北大核心
2013年第12期144-150,共7页
Laser & Optoelectronics Progress
基金
国家自然科学基金青年基金(10904060)
中央高校基本科研业务费专项资金
关键词
激光光学
半高斯激光束
传输特性
自由空间
laser optics
semi-Gaussian laser beam
propagation property
free space
