OAM激光光源的产生和OAM态检测技术研究

发布时间：2018-01-13 05:09

本文关键词：OAM激光光源的产生和OAM态检测技术研究　出处：《北京理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：涡旋光束携带轨道角动量（OrbitalAngular Momentum，OAM），是近年来人们研究的热点，尤其是近两年，涡旋光束受到国内学者越来越多的重视。本文主要研究OAM激光光源的产生及OAM态的检测技术。其中，数字激光器作为一种生成OAM光波的新方法为本文主要研究内容。OAM态的检测方法有很多，本文主要基于空间光调制器，通过设计全息光栅，达到增大OAM态的检测范围和简化测量方法的目的。在测量OAM态之前，本文也涉及到如何生成一个纯度较高的OAM光波及两个OAM光波的生成，以提供OAM检测光源。数字激光器基于传统激光器，成熟的传统激光器设计经验和高性能的空间光调制器（Spatial Light Modulator）是设计数字激光器的前提条件。考虑到光束轨道角动量在1550nm通信波段中的应用背景，在该波段附近，本文基于1.645μm的Er：YAG激光器及Holoeye的PLUTO-Telco空间光调制器，对数字激光器进行仿真和设计。本论文主要完成以下几个方面的工作： 1、介绍了涡旋光束的国内外研究进展，包括涡旋光束的生成方法和检测方法。对涡旋光束的历史发展做一个整体回顾，对最新研究进展进行总结。 2、利用空间光调制器生成一个高纯度的拉盖尔-高斯光束。利用两种方法，棋盘相格法和闪耀光栅法使纯相位空间光调制器实现振幅调制。提出两种利用空间光调制器实现OAM态叠加的方法。 3、利用MATLAB软件对数字激光器的谐振腔选模进行仿真，通过控制光阑孔径和损耗实现了模式的选择，输出不同阶数的拉盖尔-高斯光束模式。根据Er:YAG晶体的参数，对数字激光器的阈值、光斑大小和谐振腔的结构进行了设计。 4、利用空间光调制器生成达曼光栅。实现角量子数由-12~+12范围的测量。通过一张全息图，实现了涡旋光束的生成、变换及检测三个过程。成功的检测出涡旋光束的轨道角动量子数。
[Abstract]:Vortex beam carrying orbital angular momentum (Orbital angular momentum) is a hot topic in recent years, especially in the last two years. Vortex beam has been paid more and more attention by domestic scholars. In this paper, the generation of OAM laser source and the detection technology of OAM state are studied. Digital laser as a new method to generate OAM light wave is the main research content in this paper. There are many methods to detect the OAM state. In this paper, the holographic grating is designed based on spatial light modulator. In order to increase the detection range of OAM states and simplify the measurement methods, this paper also discusses how to generate a high purity OAM light wave and two OAM light waves before measuring the OAM state. To provide a OAM detection light source. Digital lasers are based on conventional lasers. Mature Design experience of traditional Laser and High performance Spatial Light Modulator. It is the precondition of designing digital laser. Considering the application background of beam orbital angular momentum in 1550nm communication band. In the vicinity of this band, this paper is based on 1. 645 渭 m er:. The digital laser is simulated and designed by YAG laser and PLUTO-Telco space light modulator of Holoeye. The main work of this thesis is as follows: 1. The research progress of vortex beam at home and abroad is introduced, including the generation method and detection method of vortex beam, the historical development of vortex beam is reviewed as a whole, and the latest research progress is summarized. 2. A high-purity Laguerre-#china_person0# beam is generated by using a spatial light modulator. Two methods are used. The chessboard phase lattice method and blazed grating method make the pure phase spatial light modulator realize amplitude modulation. Two methods of OAM state superposition using spatial light modulator are presented. 3. The mode selection of the digital laser resonator is simulated by MATLAB software, and the mode selection is realized by controlling the aperture and loss of the aperture. The Laguerre-#china_person0# beam mode with different order is output. According to the parameters of Er:YAG crystal, the threshold value, spot size and resonator structure of the digital laser are designed. 4. The Darman grating is generated by the spatial light modulator. The angular quantum number is measured from -12 to 12. The vortex beam is generated by a hologram. The orbital angular momentum subnumbers of the vortex beam are successfully detected by the three processes of transformation and detection.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248

【参考文献】