本文關(guān)鍵詞：特殊關(guān)聯(lián)部分相干光束傳輸與緊聚焦特性的理論研究　出處：《中國(guó)科學(xué)技術(shù)大學(xué)》2016年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 部分相干 特殊關(guān)聯(lián)函數(shù) 傳輸特性 聚焦特性 光學(xué)捕獲

【摘要】：激光束因具有方向性強(qiáng)、單色性好、高相干性和高能量等優(yōu)點(diǎn),因而在激光通信、成像以及光學(xué)捕獲等領(lǐng)域有著重要的實(shí)際應(yīng)用。但在某些方面,部分相干光束比完全相干光束表現(xiàn)出獨(dú)特的優(yōu)越性,因而受到眾多學(xué)者的廣泛關(guān)注。在過去的幾十年里,人們對(duì)部分相干光束的研究大多數(shù)都是基于傳統(tǒng)的高斯謝爾模關(guān)聯(lián)函數(shù),其空間關(guān)聯(lián)結(jié)構(gòu)滿足高斯函數(shù)分布。但部分相干光束的空間關(guān)聯(lián)結(jié)構(gòu)不僅只是局限于高斯函數(shù)的分布形式,可以通過一定的手段來對(duì)其空間關(guān)聯(lián)結(jié)構(gòu)進(jìn)行調(diào)控,使其具有特殊的空間關(guān)聯(lián)結(jié)構(gòu)分布。自Gori等人提出了構(gòu)建具有特殊關(guān)聯(lián)空間結(jié)構(gòu)的部分相干光束的充分條件,一系列特殊關(guān)聯(lián)空間結(jié)構(gòu)的部分相干光束的理論模型相繼被提出并于實(shí)驗(yàn)上產(chǎn)生。由于其獨(dú)特的空間結(jié)構(gòu)相干特性,該類特殊關(guān)聯(lián)部分相干光束表現(xiàn)出新穎的傳輸和聚焦特性。近年來,具有非傳統(tǒng)關(guān)聯(lián)結(jié)構(gòu)的部分相干光束在各種介質(zhì)中傳輸與聚焦特性引起眾多學(xué)者的廣泛關(guān)注。本論文主要是研究此類特殊關(guān)聯(lián)部分相干光束在大氣湍流和晶體介質(zhì)中的傳輸特性,以及在通過高數(shù)值孔徑透鏡后的緊聚焦特性和對(duì)微粒的捕獲力。本論文主要內(nèi)容包括：第一章首先介紹了部分相干光束的研究背景和基本理論,再引入具有特殊關(guān)聯(lián)空間結(jié)構(gòu)的部分相干光束的構(gòu)建基本理論、研究現(xiàn)狀和研究意義,簡(jiǎn)要概況了本論文的研究思路和研究?jī)?nèi)容。第二章基于拓展惠更斯ˇ菲涅爾原理和魏格納分布函數(shù)的二階矩理論,理論推導(dǎo)出余弦高斯關(guān)聯(lián)謝爾模(CGSM)光束在non-Kolmogorov湍流中傳輸因子的解析表達(dá)式,具體分析了不同光束參數(shù)和湍流參數(shù)對(duì)方均根角寬發(fā)散和歸一化傳輸因子的影響,并與傳統(tǒng)部分相干光束的傳輸特性進(jìn)行比較,探求改善光束傳輸性能和減小湍流負(fù)效應(yīng)的方法。第三章基于傍軸矢量傳輸理論,推導(dǎo)出正交余弦高斯謝爾模(OCGSM)光束在各向異性單軸晶體中垂直于光軸傳輸?shù)慕馕霰磉_(dá)式,數(shù)值計(jì)算并分析了OCGSM光束在單軸晶體中傳輸時(shí)其光強(qiáng)、偏振度和相干度的分布情況,并與傳統(tǒng)的部分相干光束在單軸晶體中的傳輸特性進(jìn)行比較。最后分析了不同光束參數(shù)和晶體折射率比對(duì)傳輸特性的影響。第四章基于Richards-Wolf矢量衍射理論,研究了拉蓋爾ˇ高斯關(guān)聯(lián)謝爾模(LGCSM)光束通過高數(shù)值孔徑透鏡系統(tǒng)后的緊聚焦特性,具體分析了LGCSM光束在焦平面處的聚焦光強(qiáng),偏振度和相干度分布,比較此類具有特殊關(guān)聯(lián)空間結(jié)構(gòu)的部分相干光束與傳統(tǒng)部分相干光束的緊聚焦特性不同之處,詳細(xì)分析了光束各參量對(duì)聚焦特性的影響。第五章基于Richards-Wolf矢量衍射理論,主要研究了徑向偏振窄寬環(huán)形光束通過高數(shù)孔徑透鏡后的緊聚焦特性及其對(duì)微粒的輻射力。提出了一種改善捕獲效率的新型且簡(jiǎn)便的方法,將一塊圓形擋板巧妙地放置在聚焦透鏡前,當(dāng)一束徑向偏振光束經(jīng)過圓形擋板時(shí)形成徑向偏振窄寬環(huán)形光束,在緊聚焦條件下可以形成更小的聚焦光斑和更長(zhǎng)的焦深。在捕獲微粒時(shí),通過適當(dāng)調(diào)節(jié)圓形擋板的半徑改變光束的環(huán)形因子,可以增強(qiáng)橫向上的光阱剛度和拓寬軸向的捕獲范圍。第六章是通過利用張量方法,理論推導(dǎo)了部分相干空心光束通過ABCD光學(xué)系統(tǒng)的傳輸解析式,研究了部分相干空心光束的聚焦特性及其對(duì)瑞利電介質(zhì)粒子的輻射力,詳細(xì)討論了不同的光束參數(shù)對(duì)輻射力和光阱剛度的影響,以及有效捕獲粒子的穩(wěn)定條件。第七章是對(duì)我的研究工作進(jìn)行總結(jié)與展望。
[Abstract]:The laser beam with strong directivity, good monochromaticity, has the advantages of high coherence and high energy, so in laser communication, imaging and optical trapping and other fields have important practical applications. But in some respects, partially coherent beams than fully coherent beams exhibit a unique superiority, which attracted widespread attention of many scholars in the past few decades, the research of coherent beam on the part of most people are the traditional Gauss Schell model correlation function based on the spatial correlation structure satisfies Gauss distribution function. But the spatial correlation of partially coherent light beams distribution structure is not confined to the Gauss function, through some means to control the spatial correlation structure, which has a special structure of the distribution of spatial association. Since Gori et al. Proposed construction has special relevance of spatial structure of the partially coherent light beam filling strip A series of special relevance, the spatial structure of the theoretical model of the coherent beam have been proposed and experimentally generated. Because of its unique characteristics of coherent spatial structure, the special relationship between the partially coherent beams exhibit propagation and focusing properties of the novel. In recent years, with the non beam transmission in a variety of media and traditional focusing characteristics the relational structure of partially coherent attracted extensive attention of many scholars. This thesis is propagating in atmospheric turbulence and crystal medium of such special relevance and tight focusing properties of partially coherent, in the high numerical aperture lens and on particle trapping force. The main contents of this paper include: the first chapter introduces partially coherent light beam research background and basic theory, then introduce construction has special relevance spatial structure of the partially coherent beams, the basic theory, research status A brief overview and the research significance, the research ideas and research content. The second chapter is based on the two order moment theory, Finel and Wegener extended Huygens principle of distribution function, derived from the theory of cosine Association Gauss Schell model (CGSM) analytical expressions for the propagation factor in non-Kolmogorov turbulence in the beam, analyzes the effect of different beam parameters and the other parameters are the root width of turbulent divergence and normalized transmission factor, and compared with the traditional transmission characteristics of partially coherent beams, the method seeks to improve the performance of beam transmission and reduce the negative effects of turbulence. In the third chapter, based on the paraxial vectorial theory, derived orthogonal cosine Gauss Schell model (OCGSM) beam in vertical analytic expression the anisotropic uniaxial crystal to the optical transmission, numerical calculation and analysis of the OCGSM beam propagating in uniaxial crystal when the intensity, degree of polarization and coherence The distribution of degree, and the traditional propagation properties of partially coherent beams in uniaxial crystals were compared. Finally, analyzed the influence of different beam parameters and the crystal refractive index ratio transmission characteristics. The fourth chapter is based on the Richards-Wolf vector diffraction theory, the study of Gauss, Laguerre correlation Schell model (LGCSM) beams through tight focusing properties the numerical aperture of the lens system, detailed analysis of the focusing intensity of LGCSM beam in the focal plane of the coherent polarization degree and degree distribution, compared with special relevance such spatial structure of partially coherent beams with the traditional partial dry tight focusing properties of beams are different, the effects of the parameters on the beam focusing characteristics are analyzed in detail. The fifth chapter is based on the Richards-Wolf vector diffraction theory, mainly studies the radially polarized narrow wide annular beam through the tight focusing properties of high aperture lens and the micro particle after The radiation force is proposed. The new method for improving the trapping efficiency and simple, a circular baffle cleverly placed on the focusing lens, when a beam of radially polarized beam through a circular baffle formed radially polarized narrow wide annular beam, under tight focusing conditions can form a small focal spot and long focal deep. In capturing particles, by adjusting the radius of circular baffle ring beam change factor, can enhance the lateral stiffness of the optical trap and widen axial capture range. The sixth chapter is by using the tensor method, the theory of partially coherent beams propagating through a hollow analytical formula of ABCD optical system is derived, on the focusing properties partially coherent hollow beam and radiation force of Rayleigh dielectric particles, the influence of different parameters on the beam radiation and optical trap stiffness is discussed in detail, and the effective capture particle stability The seventh chapter is a summary and Prospect of my research work.

【學(xué)位授予單位】：中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：O436

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