产生长距离Mathieu光束的方法

Method of Obtaining Long-Distance Mathieu Beam

设计一套提高Mathieu光束无衍射距离的光学系统,并进行数值模拟.根据传统的方法,利用轴棱锥聚焦椭圆高斯振幅调制的平面波产生Mathieu光束;同时,基于凹透镜对光束的发散特性,将其放置在轴棱锥的前方,使Mathieu光束的无衍射距离得到提高.使用Mathcad软件进行模拟,并将新系统与传统方法对比.结果表明:利用凹透镜系统,可以得到无衍射距离大、质量较高的Mathieu光束.

We have designed and simulated an optical system to increase non-diffracting distance of Mathieu beam.According to the traditional method,we focused a plane wave modulated by elliptical Gaussian amplitude to get the Mathieu beam.And based on the divergence characteristics to the beam by using the concave lens,the concave lens was placed in front of the axicon to increase the non-diffracting distance of Mathieu beam.The simulation was carried out by using software Mathcad,the new system and the traditional method was compared.Results show that the Mathieu beam with longer distance and higher quality can be obtained by the new system.