本文選題：端面泵浦固體激光器　切入點：高階拉蓋爾高斯光束　出處：《華中科技大學(xué)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：隨著光學(xué)應(yīng)用在各個領(lǐng)域的不斷深入,高階拉蓋爾高斯(Laguerre Gaussian, LG)光束與高階貝塞爾高斯(Bessel Gaussian, BG)光束由于其獨特的光學(xué)特性在近二十年來逐步引起了人們的廣泛關(guān)注,不僅應(yīng)用到光鑷、超材料激光加工、熒光受激損耗發(fā)射技術(shù)、自由空間光通信等經(jīng)典領(lǐng)域,還深入到量子糾纏和量子通信等領(lǐng)域。而研究高階LG光束和BG光束的基礎(chǔ)和關(guān)鍵之一在于如何獲得模式純度高的光束。輸出高階LG光束與BG光束的端面泵浦固體激光器因其全固態(tài)、效率高、輸出光束功率高、光束模式純度高、結(jié)構(gòu)緊湊、穩(wěn)定性高等優(yōu)點,得到了持久和深入的研究。本論文基于激光諧振腔中增益與損耗控制的橫模選擇技術(shù),對輸出高階LG光束和BG光束端面泵浦固體激光器進行了深入的研究。論文首先介紹了高階LG光束和BG光束在各領(lǐng)域中的應(yīng)用,分析了各種高階光束的產(chǎn)生方法,并綜合輸出高階LG光束和BG光束的端面泵浦固體激光器的國內(nèi)外研究進展,提出了基于增益與損耗控制的輸出高階LG光束和BG光束端面泵浦固體激光器的思路。本論文的主要研究內(nèi)容由以下幾部分組成：基于激光諧振腔橫模選擇技術(shù)中的增益控制的原理,提出了一種環(huán)形光束端面泵浦固體激光器結(jié)構(gòu),實驗上實現(xiàn)了渦旋拉蓋爾高斯(vortex Laguerre Gaussian, vLG)光束的連續(xù)和脈沖輸出。設(shè)計了一種環(huán)形泵浦光形成的裝置和方法,分別從光線追跡和衍射積分角度,分析了該裝置的實現(xiàn)原理與輸出光束光學(xué)特性,并進行了實驗驗證�；谠鲆婵刂频脑�,采用該裝置形成的環(huán)形光束端面泵浦a切Nd:YVO4晶體,搭建了固體激光器,實現(xiàn)了最大輸出功率574mW的vLG0,1光束連續(xù)輸出。輸出光束的軌道角動量特性由馬赫增德爾干涉儀來檢測：并在該連續(xù)工作的激光器中插入被動調(diào)Q晶體Cr4+:YAG后,實現(xiàn)了重復(fù)頻率65KHz,脈寬198ns的脈沖vLG光束輸出。提出了環(huán)形光束端面泵浦下圓棒激光晶體的熱效應(yīng)模型。從一維熱傳導(dǎo)方程出發(fā),將環(huán)形光束等效為半徑方向上離軸高斯光束,理論推導(dǎo)了圓棒激光晶體在環(huán)形光束端面泵浦下的溫度分布、熱致相位差分布、等效熱焦距和熱致?lián)p耗。以1.3%摻雜的Nd:YAG圓棒激光晶體為例,模擬分析了激光晶體內(nèi)溫度、熱致光程差、等效熱焦距和熱致?lián)p耗隨著環(huán)形泵浦光尺寸的變化規(guī)律。模擬結(jié)果表明,在相同泵浦功率下,相對于實心光束泵浦,環(huán)形泵浦下,晶體中心部分的溫度升高明顯降低,這對于提高泵浦效率提供了有利保障；模擬結(jié)果還表明,相對于環(huán)形泵浦光的厚度,環(huán)形泵浦光的光強最強中心位置更加影響激光晶體的熱分布。基于平凹諧振腔中橫模選擇技術(shù)的損耗控制原理,提出了一種基于損耗控制的高階LG光束輸出的激光器結(jié)構(gòu)。從高階LG光束的光強空間分布特性出發(fā),在光強節(jié)線分布位置,通過插入振幅模板,利用振幅模板對于各個高階LG光束的透過率不同,達到增大包括基模在內(nèi)其它模式損耗的目的。采用有源諧振腔的模擬方法,分別模擬了徑向高階LG光束、角向高階LG光束和常規(guī)高階LG光束的選擇激發(fā)和輸出。模擬結(jié)果表明該諧振腔結(jié)構(gòu)輸出的高階LG光束的模式純度均超過93%。并分析了插入振幅模板的端面泵浦有源諧振腔內(nèi)損耗分布,建立了該激光器的損耗分布模型。最后,采用修正的馬赫-曾德爾干涉儀對腔外高階LG轉(zhuǎn)換成高階vLG光束的方法進行了探討�；谳S棱錐諧振腔中橫模選擇技術(shù)的損耗控制原理,提出了一種基于損耗控制的疊加態(tài)的高階BG光束輸出的激光器結(jié)構(gòu)。研究了軸棱錐諧振腔中振蕩高階BG光束的模式特性,指出了其振蕩的模式是兩個渦旋方向相反的高階BG光束的疊加。利用損耗控制的方法,在諧振腔中放置振幅模板,利用振幅模板對于各個高階BG光束的透過率不同,增大目標(biāo)模式以外其它模式的損耗。采用有源諧振腔的模擬方法,模擬了疊加態(tài)高階BG光束的輸出。并對該激光器模擬輸出光束的自由空間傳輸特性和角譜特性進行了研究,模擬結(jié)果表明該激光器輸出光束具有無衍射特性,具備高階BG光束的特性。同時,采用軌道角動量譜分析方法對其模式組成進行了分析,結(jié)果表明軸棱錐諧振腔中振蕩的高階光束是疊加態(tài)的高階BG光束。
[Abstract]:With the development of optical applications in various fields, high order La Gail Goss (Laguerre Gaussian, LG) beam with high order Beisel Goss (Bessel Gaussian, BG) beam due to its unique optical properties gradually aroused people's attention in the past twenty years, not only to the application of optical tweezers, ultra laser processing of materials, by fluorescence the loss of excitation emission technology, free space optical communication and other classical field, but also deep into the quantum entanglement and quantum communication and other fields. And the study of high order LG beam and BG beam is one of the foundation and the key is how to obtain the high purity of the beam mode. The end pumped solid state laser output of high order LG beam and BG beam because of its solid state, high efficiency, high power output beam, beam mode of high purity, compact structure, high stability and other advantages, has been sustained and in-depth study. This thesis is based on the gain and loss of control of laser resonator The transverse mode selection technique, the output of high order LG beam and BG beam end pumped solid-state laser is studied. The paper firstly introduces the application of high order LG beam and BG beam in various fields, analyzes the producing methods of various high order beam, research progress of end pumped solid-state lasers and high output order LG beam and BG beam at home and abroad, put forward the gain and loss of control output of high order LG beam and BG beam end pumped solid-state laser based on the idea. The main research contents of this paper consists of the following parts: the principle of laser resonant cavity transverse mode selection technology based gain control, put forward an annular beam pumped solid-state laser structure, carry out experiments on vortex La Gail Goss (vortex Laguerre Gaussian, vLG) continuous and pulse output beam. The design of an annular pump form A device and a method for tracing and diffraction integral respectively from the angle of light, analyzes the implementation principle and the output beam optical characteristics of the device, and verified by experiments. The principle of gain control based on annular beam pumped form using the device a cut Nd:YVO4 crystal, build a solid laser beam to achieve the vLG0,1 the maximum output power of 574mW continuous output. The output of the orbital angular momentum of light characteristics by Machka Del interferometer to detect and insert passively Q crystal Cr4+ laser in the continuous work: YAG, the 65KHz repetition rate, pulse width 198ns vLG output beam. The thermal effect of laser crystal with circular ring rod model the beam end pumped down. Starting from the one-dimensional heat conduction equation, the annular beam is equivalent to the radius direction of off-axis Gauss beam, deduced the rod laser crystal in the annular beam end The temperature distribution of surface pumped by thermally induced phase difference, distribution, loss and heat. The equivalent thermal focal length with 1.3% doped Nd:YAG rod laser crystal as an example, simulation analysis of the temperature of laser crystal, thermal optical path difference, the equivalent thermal focal length and thermally induced losses with varying ring pump size simulation. The results show that under the same pumping power, compared with a solid beam pump, annular pump, the central part of the crystal temperature decreased obviously, which for providing favorable protection to improve the pumping efficiency; the simulation results also show that relative to the annular pump thickness, more light intensity was the strongest central position of the ring-shaped pump heat distribution in the laser crystal plano concave resonator. In the transverse mode selection technology based on the principle of loss control, proposed a laser structure of high order LG output beam loss control based on light intensity. From the high order space LG beam points Fabric characteristics, distribution of light intensity in the pitch line, by inserting the amplitude mask, using amplitude template for each high order LG beam through the different rate of increase, including the fundamental mode, other modes of loss. The simulation method of active resonator, respectively to simulate the radial high order LG beam, the angle to the higher order LG beam and conventional high order LG beam excitation and output. The simulation results show that the high order mode purity LG beam output of the resonant cavity structure of more than 93%. and the analysis of the distribution of end pumped active resonant cavity loss into amplitude template, a loss distribution model of the laser. Finally, using the modified Maher had Del interferometer outside the cavity of high order LG into high order vLG beams are discussed. The axicon resonator transverse mode selection technology based on the principle of loss control, propose a method based on loss control The laser structure of high order BG output beam superposition system. Research on mode characteristics of the axicon in the resonant cavity oscillation of high order BG beam, the oscillation mode is the two scroll in the opposite direction of high order BG beam superposition. Using the method of loss of control, the amplitude of the template in place in the resonant cavity for each template, using the amplitude of high order BG light transmittance of different loss increases other than the target mode mode. Using simulation method of active resonator, simulate the output of superposition of higher-order BG beams. And the free space propagation characteristics and the angle of the laser beam simulation output spectrum is studied, simulation the results show that the laser beam has no diffraction characteristics, has the characteristics of high order BG beam. At the same time, the orbital angular momentum spectrum analysis method on the model were analyzed, results show that the axicon resonant cavity The high order beam of the medium oscillation is the high order BG beam of the superposition state.

【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TN248

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