Far-Field Divergence Angle and Directionality of One Dimensional Off-Axis Gaussian Beams
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摘要: 根据广义惠更斯-菲涅尔原理,采用积分变换,推导出一维线阵离轴高斯光束通过自由空间传输的远场发散角解析式,以研究其远场发散角的特性和方向性.研究表明:一维线阵离轴高斯光束的远场发散角随子光束数目增加和子光束相对间距减小而减小;当子光束数目和相对间距增大到一定值后,远场发散角变化缓慢;在一定条件下,一维线阵离轴高斯光束与单束高斯光束具有相同的方向性.
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关键词:
- 一维线阵离轴高斯光束 /
- 自由空间 /
- 远场发散角 /
- 方向性
Abstract: Based on the Huygens-Fresnel principle,the analytical expression for the far-field divergence angle of one-dimensional off-axis Gaussian beams propagating in free space was derived using the integral transform technique to study the properties of the far-field divergence angle and the directionality.The results show that the far-field divergence angle of an one-dimensional off-axis Gaussian beam decreases with an increase in beam number and a decrease in relative separation distance between subbeams,it varies a little when the beam number and the relative separation distances between subbeams are large enough,and under a certain condition,an one-dimensional off-axis Gaussian beam has the same directionality as an one Gaussian beam does. -
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