摘要
介绍了以被动方式产生近似无衍射贝塞尔光的基本原理。给出了双透镜轴棱锥法、不透明障碍物法和可调流体轴棱锥法等3种被动式产生近似无衍射贝塞尔光束的最新技术,分析了这3种方法的优缺点。双透镜轴棱锥法主要基于透镜球面像差的运用,与衍射轴棱锥、折射轴棱锥和早期的非球面轴棱锥相比,具有加工简单、便宜,易于制作大尺寸的特点;不透明障碍物法得到的贝塞尔光束具有很长的无衍射距离,其直径可通过选择不同焦距的准直透镜来得到调节;可调流体轴棱锥是一种产生贝塞尔光束的新型器件,它可以很容易地通过改变注入器件的液体的折射率来得到不同参量的贝塞尔光束。文章最后提出无衍射贝塞尔光的研究将向着光束质量好,距离远,可调谐性好,制作工艺简单的方向发展。
The fundamental principle of generating approximate non-diffracting beams by using passive methods was introduced. Then, three kind of methods, namely, lens axicon method, opaque disk method, and tunable fluidic conical lens method, were given, and advantages and disadvantages of the methods were analyzed. The lens axicon is based on the use of the spherical aberration of the mirror surfaces, which is inexpensive and easy to manufacture into a element with large apertures as compared with diffractive axicons, refractive cone axicons, and earlier lens axicons with aspheric surfaces; the opaque disk can offer the Bessel beams with long non-diffracting distances, and the diameter of the central peak is adjusted by choosing the focal length of the collimating lens;the tunable fluidic conical lens is a new device for generating Bessel beams, which can obtain the Bessel beams with different parameters by varying the refractive indexes of the solution which is filled in the device. Finally, this paper points out that the generating methods of the non-diffracting Bessel beams tend to have good quality, higher speeds, longer distances and simpler manufacture technologies.
出处
《中国光学与应用光学》
2009年第4期289-295,共7页
Chinese Optics and Applied Optics Abstracts
基金
国家自然科学基金资助项目(No.60477041)
福建省自然科学基金计划资助项目(No.A0710011)
关键词
无衍射光束
被动产生方式
主动产生方式
non-diffracting beam
passive generating method
active generating method
