本文選題：時(shí)空對(duì)準(zhǔn) + 雙光束��； 參考：《中國(guó)科學(xué)院研究生院(上海應(yīng)用物理研究所)》2017年碩士論文

【摘要】：單脈沖分束三維成像裝置是一套基于上海軟X射線自由電子激光特點(diǎn)設(shè)計(jì)的三維X射線成像實(shí)驗(yàn)裝置。自由電子激光已被用于進(jìn)行樣品的三維成像,但由于其單個(gè)脈沖的能量很高,樣品照射后即被破壞,只能針對(duì)某些特殊樣品(如具有特殊對(duì)稱(chēng)性)進(jìn)行三維成像。單脈沖分束三維成像裝置通過(guò)將自由電子激光單脈沖分為兩束,從不同角度同時(shí)照射樣品來(lái)實(shí)現(xiàn)一般性樣品的三維CDI成像。為了使兩束光能同時(shí)照射到樣品上,準(zhǔn)備采用可見(jiàn)光白光干涉的原理進(jìn)行離線時(shí)空對(duì)準(zhǔn),再采用自由電子激光進(jìn)行在線精調(diào)。本論文的研究工作就是搭建了一套離線對(duì)準(zhǔn)模擬裝置,利用可見(jiàn)光白光干涉原理進(jìn)行了理論模擬并實(shí)現(xiàn)了時(shí)空對(duì)準(zhǔn),對(duì)自由電子激光雙光束三維成像裝置的時(shí)空對(duì)準(zhǔn)進(jìn)行了驗(yàn)證。論文主要包含以下兩個(gè)方面:1、基于可見(jiàn)光白光離線對(duì)準(zhǔn)原理設(shè)計(jì)了一套離線對(duì)準(zhǔn)系統(tǒng),并利用波動(dòng)光學(xué)原理和MATLAB軟件對(duì)其進(jìn)行了離線時(shí)空對(duì)準(zhǔn)原理的理論模擬,得出了等光程點(diǎn)移動(dòng)量與光程差改變量之間的線性關(guān)系,驗(yàn)證了利用可見(jiàn)光白光干涉進(jìn)行時(shí)空對(duì)準(zhǔn)的可行性。2、根據(jù)理論模擬結(jié)果搭建了離線對(duì)準(zhǔn)系統(tǒng),并實(shí)現(xiàn)了時(shí)空對(duì)準(zhǔn),實(shí)驗(yàn)結(jié)果與理論結(jié)果符合較好,系統(tǒng)的時(shí)間調(diào)節(jié)精度為48.1fs。該系統(tǒng)經(jīng)簡(jiǎn)單改進(jìn)(更換光學(xué)鏡頭),將來(lái)可直接用于自由電子激光雙光束單脈沖三維成像裝置的離線對(duì)準(zhǔn)調(diào)節(jié)。
[Abstract]:The monopulse beam splitting 3D imaging device is a 3D X-ray imaging experimental device based on the characteristics of Shanghai soft X-ray free electron laser. Free-electron laser has been used for 3D imaging of samples, but because of its high energy of single pulse, the sample is destroyed after irradiation, so it can only be used for 3D imaging of some special samples (such as special symmetry). The monopulse beam splitting 3D imaging device divides the free electron laser single pulse into two beams and irradiates the sample simultaneously from different angles to realize the 3D CDI imaging of the general sample. In order to irradiate two beams of light onto the sample at the same time, the principle of white visible light interference is used for off-line space-time alignment, and then the free-electron laser is used for on-line fine tuning. The research work of this paper is to set up a set of off-line alignment simulation device, using the principle of visible white light interference to carry out theoretical simulation and realize space-time alignment. The spatiotemporal alignment of a free electron laser dual beam 3D imaging device is verified. This paper mainly includes the following two aspects: 1. Based on the principle of white visible light off-line alignment, a set of off-line alignment system is designed, and the theory of off-line space-time alignment is simulated by using wave optics principle and MATLAB software. The linear relationship between the equal path point movement and the optical path difference change is obtained, and the feasibility of space-time alignment using white visible light interference is verified. According to the theoretical simulation results, an off-line alignment system is built, and the spatio-temporal alignment is realized. The experimental results are in good agreement with the theoretical results, and the time adjustment accuracy of the system is 48.1 fs. The system can be directly used in the off-line alignment adjustment of free electron laser double beam monopulse 3D imaging device.
【學(xué)位授予單位】：中國(guó)科學(xué)院研究生院(上海應(yīng)用物理研究所)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TL50;TN249

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