参数可控长距无衍射光束的生成方法研究

为了消除光学器件几何参数对无衍射光束传播特性调整的限制, 实现长距空间中无衍射光束传播时特性参数的可控性, 首先, 通过研究axicon折射阴影区的电场分布特征, 发现axicon无衍射区外过临界面后的近轴区域虽处于几何折射阴影近轴区域内, 但仍存在光强服从第一类零阶贝赛尔函数分布的球面波; 以此为基础, 提出了一种不受传播空间距离限制的无衍射光束的生成方式; 最后, 在近12 m的尺度范围内进行无衍射光传播特性参数测试, 发现其实验参数与理论计算值的差值不超过01 μm。该无衍射光通过对第一类零阶贝塞尔函数分布的球面衍射光斑准直生成, 本质上区别于传统的干涉无衍射光束生成方式, 易于生成大尺度空间无衍射光束。该无衍射光生成方式适合用于非能量使用情况下大尺度空间的直线基准、光束空间通讯等领域, 具有较大的价值与意义。

Abstract

In order to eliminate the restriction of optical device geometrical parameters on the propagation characteristics of non-diffracting beams and to achieve the controllability of the characteristic parameters of non-diffracting beams propagating in long-distance space, the generation method of parameter controlled non-diffracting beam over long distance is studied in this paper. First of all, by studying the electric field distribution of the axicon refraction shadow area, it is found that although the paraxial area beyond the critical surface of the axicon non-diffractive area is in the paraxial area of the geometric refraction shadow, there is still a spherical wave whose intensity follows first kind of zero-order Bessel function distribution. On this basis, a non-diffracting light generation method is proposed which is not limited by the distance of the propagation space. Finally, the parameters of the non-diffracing light propagation characteristics are tested in the range of nearly 12 m, and it is found that the difference between the experimental and theoretical values is less than 01 μm. The non-diffracting beam is generated by collimating spherical diffracted light spots of the first kind of zero-order Bessel function distribution, which is essentially different from the traditional method of generating interference and non-diffracting light beams and is easy to generate large-scale space non-diffracting beams. In general, this method is particularly suitable for the use in non-energy conditions, such as large-scale linear reference space, beam space communications, and has enormous engineering application value.

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马国鹭, 刘丽贤, 杨贵洋, 赵斌. 参数可控长距无衍射光束的生成方法研究[J]. 中国光学, 2018, 11(1): 100. MA Guo-lu, LIU Li-xian, YANG Gui-yang, ZHAO Bin. Generating method of non-diffracting beam with long-distance propagation and controllable parameters[J]. Chinese Optics, 2018, 11(1): 100.

参数可控长距无衍射光束的生成方法研究

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