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超短拉盖尔-高斯脉冲光束的模式展开方法研究

发表时间:2013-08-15  浏览量:1256  下载量:343
全部作者: 杨富萍,黄立,刘义东
作者单位: 电子科技大学物理电子学院
摘 要: 建立一个对连续拉盖尔-高斯光束(Laguerre-Gaussian beam, LGB)进行“切片”的方法,得到超短脉冲模型,此脉冲光被展开成一系列具有相同角向量子束和不同径向量子数的LGB光束的叠加,脉冲的时变特性和传输特性均包含在展开系数中。通过分析可知:入射光的径向量子数越大,模式弥散越严重,着重讨论入射LGB光束的径向量子数为0的情形。在传输距离不长(如2zR)时,与入射光具有相同角向量子数模式(原始模式)的光束具有相似的传输特性,在传输时此模式将发生幅度上的衰减、空间上的展宽和时间上的延迟。特别是在较大的角量子数情况下,该现象尤为明显。以上结论对采用轨道角动量复用(orbital angular momentum division multiplexing,OAM-DM)的光通信技术有重要意义。
关 键 词: 光学;超短脉冲;拉盖尔-高斯光束;轨道角动量复用
Title: Study on the mode expansion method of the wlrashort pulse Laguerre-Gaussian beam
Author: YANG Fuping, HUANG Li, LIU Yidong
Organization: School of Physical Electronics, University of Electronic Science and Technology of China
Abstract: A model of ultrashort pulse beam was generated by chopping the single mode continuous Laguerre-Gaussian beam (LGB) into thin slices in this work. The pulse LGB was expanded into a series of LGBs with the same angular number and different radial numbers. The expansion coefficients might show the time-varying and propagating characteristics of the pulse helical beam. Our analysis showed that mode dispersion was more serious with bigger radial number of incident LGB. In this work, we focused on the case of zero radial number of incident beams. In short propagation distance, e.g. less than 2zR, the beam with the same angular number with the incident beam, i.e. original mode, had similar propagating characteristics. The amplitude attenuation, spatial spreading and time delay would occur when original mode propagated. This phenomenon was even evident for the case of bigger angular number of the incident beam. The abovementioned conclusions are significant for optical communication using the orbital angular momentum division multiplexing (OAM-DM) technology.
Key words: optics; ultrashort pulse; Laguerre-Gaussian beam; orbital angular momentum division multiplexing
发表期数: 2013年8月第15期
引用格式: 杨富萍,黄立,刘义东. 超短拉盖尔-高斯脉冲光束的模式展开方法研究[J]. 中国科技论文在线精品论文,2013,6(15):1379-1384.
 
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