本文關(guān)鍵詞：OAM激光光源的產(chǎn)生和OAM態(tài)檢測技術(shù)研究　出處：《北京理工大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 渦旋光束 軌道角動量子數(shù) 空間光調(diào)制器 螺旋相位片 達曼光柵 數(shù)字激光器

【摘要】：渦旋光束攜帶軌道角動量（OrbitalAngular Momentum，OAM），是近年來人們研究的熱點，尤其是近兩年，渦旋光束受到國內(nèi)學者越來越多的重視。本文主要研究OAM激光光源的產(chǎn)生及OAM態(tài)的檢測技術(shù)。其中，數(shù)字激光器作為一種生成OAM光波的新方法為本文主要研究內(nèi)容。OAM態(tài)的檢測方法有很多，本文主要基于空間光調(diào)制器，通過設(shè)計全息光柵，達到增大OAM態(tài)的檢測范圍和簡化測量方法的目的。在測量OAM態(tài)之前，本文也涉及到如何生成一個純度較高的OAM光波及兩個OAM光波的生成，以提供OAM檢測光源。數(shù)字激光器基于傳統(tǒng)激光器，成熟的傳統(tǒng)激光器設(shè)計經(jīng)驗和高性能的空間光調(diào)制器（Spatial Light Modulator）是設(shè)計數(shù)字激光器的前提條件�？紤]到光束軌道角動量在1550nm通信波段中的應用背景，在該波段附近，本文基于1.645μm的Er：YAG激光器及Holoeye的PLUTO-Telco空間光調(diào)制器，對數(shù)字激光器進行仿真和設(shè)計。 本論文主要完成以下幾個方面的工作： 1、介紹了渦旋光束的國內(nèi)外研究進展，包括渦旋光束的生成方法和檢測方法。對渦旋光束的歷史發(fā)展做一個整體回顧，對最新研究進展進行總結(jié)。 2、利用空間光調(diào)制器生成一個高純度的拉蓋爾-高斯光束。利用兩種方法，棋盤相格法和閃耀光柵法使純相位空間光調(diào)制器實現(xiàn)振幅調(diào)制。提出兩種利用空間光調(diào)制器實現(xiàn)OAM態(tài)疊加的方法。 3、利用MATLAB軟件對數(shù)字激光器的諧振腔選模進行仿真，通過控制光闌孔徑和損耗實現(xiàn)了模式的選擇，輸出不同階數(shù)的拉蓋爾-高斯光束模式。根據(jù)Er:YAG晶體的參數(shù)，對數(shù)字激光器的閾值、光斑大小和諧振腔的結(jié)構(gòu)進行了設(shè)計。 4、利用空間光調(diào)制器生成達曼光柵。實現(xiàn)角量子數(shù)由-12~+12范圍的測量。通過一張全息圖，實現(xiàn)了渦旋光束的生成、變換及檢測三個過程。成功的檢測出渦旋光束的軌道角動量子數(shù)。
[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.
【學位授予單位】：北京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248

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