本文選題：非共線光參量放大 + 空間分辨率　； 參考：《深圳大學(xué)》2016年博士論文

【摘要】：光參量放大技術(shù)是一種典型的非線性技術(shù)。由于其結(jié)構(gòu)簡單,可以獲得高增益、高質(zhì)量、寬頻帶的功率和能量放大,因此在眾多場合和領(lǐng)域被廣泛應(yīng)用,其中包括應(yīng)用于圖像信息領(lǐng)域的光參量放大成像。本論文將這種技術(shù)拓展應(yīng)用于瞬態(tài)光學(xué)成像領(lǐng)域。瞬態(tài)光學(xué)成像是研究超快變化過程的主要光學(xué)探測手段,它廣泛地應(yīng)用于對超快過程的診斷,能夠同時獲得超快變化過程的時間和空間信息。準確地獲取超快過程的時間和空間信息,揭示其動態(tài)規(guī)律并加以控制利用在物理、化學(xué)、生物以及醫(yī)學(xué)等領(lǐng)域都有著重要的應(yīng)用。涉及到國家的軍事、航天、科研、醫(yī)療和工業(yè)等方方面面的技術(shù)進步,具有重要的科學(xué)研究價值以及社會和經(jīng)濟價值。目前,隨著超短脈沖技術(shù)的發(fā)展,超短脈沖激光已經(jīng)被廣泛地應(yīng)用于各類超快過程的成像中并將超快成像的時間分辨率推進到皮秒以及飛秒?yún)^(qū)域。本學(xué)位論文提出了一種基于光參量放大的飛秒級分辨的瞬態(tài)成像技術(shù)。論文內(nèi)容包括研究的背景介紹,光參量放大的基本理論介紹,基于光參量放大基本成像特性分析,高增益、高空間分辨的光參量放大成像技術(shù),采用飛秒激光泵浦-探測的非共線光參量放大超快多幅成像技術(shù),基于非共線光參量放大的超快實時多幅成像技術(shù)以及總結(jié)與展望。其中主要的研究內(nèi)容可以概括為以下幾點:1.從理論上計算分析了如何實現(xiàn)高增益、高空間頻率帶寬的光參量放大成像系統(tǒng),包括不同的晶體(β-BBO、LBO、KDP)、晶體厚度、泵浦光強度及其空間分布等方面的因素。討論分析了光參量放大的成像特性,包括其增益特性、空間頻率帶寬特性等等。計算結(jié)果表明:β-BBO晶體在可見光、近紅外的光參量放大中顯示了更為優(yōu)良的增益與帶寬特性;薄的晶體不利于高增益的光參量放大,但是可以獲得大的空間頻率帶寬與光譜帶寬;強的泵浦光強有利于實現(xiàn)高增益、高頻率帶寬的光參量放大;均勻的泵浦有助于成像分辨率的提高。這些結(jié)果為我們的實驗研究提供了理論支撐。2.設(shè)計實現(xiàn)了高增益、高空間分辨的非共線光參量放大成像方案的實驗。根據(jù)成像照明信號光源的不同,實驗研究的方案包括兩種:一種是采用連續(xù)光照明、超短脈沖泵浦的光參量放大成像方案,其特色是結(jié)構(gòu)簡單緊湊、照明波長選擇自由度高、高強度的飛秒脈沖泵浦提供了高增益、高空間分辨帶寬的光參量放大器;另外一種是信號光和泵浦光均為飛秒脈沖激光的光參量放大成像方案。每一種方案又分別設(shè)計了type-I和type-II兩種相位匹配方式進行實驗,并在實驗中獲得了高增益、高空間分辨的閑頻光成像。特別是,我們首次提出了利用非共線的.type-.II相位匹配的.光參量放大.成像成像方案獲得高空間分辨的閑頻光圖像.,通過非共線角的設(shè)計,不僅有效地抑制了空間幾何拖尾效應(yīng)引起的圖像模糊,而且實現(xiàn)了角度的非臨界相位匹配獲得了更大的空間頻率帶寬。在實驗中,獲得了增益高達104,水平方向上空間分辨率達到20.16 lp/mm、豎直方向上空間分辨率達到25.39lp/mm的閑頻光圖像,對應(yīng)的二維空間帶寬積高達73000。3.利用飛秒激光泵浦-探測的方法,實驗研究了基于非共線光參量放大超快多幅成像裝置。實驗中分別采用連續(xù)光照明、超短脈沖泵浦的光參量放大超快多幅成像以及信號光和泵浦光均采用飛秒脈沖激光的光參量放大超快多幅成像兩種成像方案。以飛秒激光脈沖產(chǎn)生的豎直方向上具有周期性空間結(jié)構(gòu)的等離子體光柵(條紋寬度約為24μm)為成像的目標物體,分別獲得了時序多幅的閑頻光圖像,成像的時間分辨率僅取決于位移平臺的精度。4.首次提出設(shè)計了一種基于非共線光參量放大的超快實時多幅成像裝置,該裝置可以.實現(xiàn)單次同時獲得4.幅時序分幅圖像,成像的時間分辨率最高可以達到35fs。該裝置的特色是各閑頻光脈沖空間分離并為各自面陣CCD記錄,從而無需任何空間掃描裝置,雖然以高攝影頻率成像卻無需快速響應(yīng)的面陣CCD。另外,強泵浦意味著高參量放大增益和寬空間帶寬,這使得成像有高空間分辨同時對記錄介質(zhì)(面陣CCD)靈敏度要求也大幅降低。實驗中分別研究討論了采用連續(xù)光照明、飛秒脈沖激光泵浦取樣與采用啁啾脈沖光作為照明光、飛秒脈沖激光泵浦取樣這兩種基于非共線光參量放大的超快實時多幅成像裝置方案,對具有周期性結(jié)構(gòu)的等離子體光柵(條紋間距約為28μm)的演化過程進行了測量,可一次實驗獲得4幅閑頻光時序圖像,實驗中分幅的時間最短為133.3fs,對應(yīng)的攝影頻率達到7.5×10~12fps。
[Abstract]:Optical parametric amplification (OPO) is a typical nonlinear technology. Because of its simple structure, it can obtain high gain, high quality, and magnification of power and energy of broadband, so it is widely used in many fields and fields, including optical parametric large imaging in the field of image information. This paper applies this technique to transient state. In the field of optical imaging, transient optical imaging is the main optical detection method for studying ultra fast change process. It is widely used in the diagnosis of super fast process, can obtain time and space information of super fast process, obtain time and space information of super fast process, reveal its dynamic law and control the use of it. There is an important application in the fields of science, chemistry, biology and medicine. It has important scientific research value and social and economic value to the military, space, scientific research, medical and industrial aspects of the country. At present, with the development of ultrashort pulse technology, ultra short pulse laser has been widely used in various fields. In the imaging of super fast process, the time resolution of ultrafast imaging is pushed to picosecond and femtosecond region. This dissertation proposes a femtosecond resolution transient imaging technique based on optical parametric amplification. The paper includes the background of the study, the basic theory of optical parametric amplification, and the basic imaging based on optical parametric amplification. Characteristics analysis, high gain, high spatial resolution optical parametric amplification imaging technology, using femtosecond laser pumping and detecting non collinear optical parametric amplification ultra fast multi amplitude imaging technology, ultra fast real-time multi amplitude imaging technology based on non collinear optical parametric amplification and summary and prospect. The main content of the research can be summarized as follows: 1. from The optical parametric amplification imaging system of high gain and high spatial frequency bandwidth is theoretically calculated and analyzed, including the factors of different crystals (beta -BBO, LBO, KDP), crystal thickness, pump light intensity and spatial distribution. The imaging characteristics of optical parametric amplification are discussed and analyzed, including its gain characteristics, spatial frequency bandwidth characteristics and so on. The results show that the beta -BBO crystal shows better gain and bandwidth characteristics in visible light and near infrared optical parametric amplification. Thin crystals are not conducive to high gain optical parametric amplification, but large spatial frequency bandwidth and spectral bandwidth can be obtained. Strong pump intensity is beneficial to high gain and high frequency bandwidth. Magnification; uniform pumping helps to improve imaging resolution. These results provide a theoretical support for our experimental research on the design and implementation of a high gain, highly spatially resolved non collinear optical parametric amplification imaging scheme. According to the difference of the light source of the imaging lighting, the scheme of the experimental research includes two methods: one is the use of.2.. The optical parametric amplification and imaging scheme of ultra short pulse pumped with light illumination and ultrashort pulse is characterized by simple compact structure, high illumination wavelength selectivity, high gain and high spatial resolution bandwidth of optical parametric amplifier with high spatial resolution bandwidth, and the other is the optical parameter of the signal and pump light for femtosecond pulse laser. For example, each scheme designs two phase matching methods of type-I and type-II respectively. In the experiment, high gain and high spatial resolution are obtained. In particular, we first proposed the use of non collinear.Type-.II phase matching, optical parametric amplification, imaging scheme to obtain high spatial resolution. Through the design of non collinear angle, it not only effectively inhibits the image blurring caused by the spatial geometric trailing effect, but also achieves greater spatial frequency bandwidth with the non critical phase matching of the angle. In the experiment, the gain is as high as 104, the spatial resolution of the horizontal direction is up to 20.16 lp/mm, the vertical direction is above the vertical direction. The free frequency optical image with a resolution of 25.39lp/mm, and the corresponding two-dimensional space bandwidth up to 73000.3. using femtosecond laser pumping detection method, the ultra fast multi amplitude imaging devices based on non collinear optical parametric amplification are experimentally studied. Both the signal light and the pump light are two imaging schemes using the optical parametric amplification of femtosecond laser pulse laser. The plasma grating with periodic spatial structure in the vertical direction of the femtosecond laser pulse (the width of the stripe is about 24 m) is the target object. The time resolution only depends on the precision of the displacement platform..4. first proposed the design of a super fast real-time multi amplitude imaging device based on non collinear optical parametric amplification. The device can achieve 4. sequential amplitude images at the same time at the same time. The highest time resolution of the imaging can reach 35fs., which is characterized by the idle frequency light pulse space. It is separated and recorded for each surface array CCD, thus without any space scanning device, although the high photography frequency imaging does not require a fast response array CCD., the strong pump means high parametric amplification gain and wide space bandwidth, which makes the imaging have high spatial resolution and the sensitivity requirements for the recording medium (array CCD) are also greatly reduced. In the experiment, two kinds of ultra fast real-time multi amplitude imaging devices based on non collinear optical parametric amplification by the continuous light illumination, the femtosecond pulse laser pumping sampling and the chirped pulse light as illuminating light and the femtosecond pulse laser pumped sampling are discussed. The plasma grating with periodic structure is about 28 mu. The evolution process of M is measured. 4 idle frequency light timing images can be obtained in one experiment. The shortest time of the experiment is 133.3fs, and the corresponding frequency is 7.5 x 10~12fps..
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：O439

【參考文獻】

相關(guān)期刊論文 前10條

1 王艷梅;張正;胡長進;張嵩;張冰;;超高速分子攝影術(shù)——飛秒泵浦-探測方法在分子超快動力學(xué)研究中的應(yīng)用[J];物理;2010年04期

2 李景鎮(zhèn);;邁向原子時間分辨的時間放大技術(shù)[J];中國科學(xué)(E輯:技術(shù)科學(xué));2009年12期

3 邵敏,薛紹林,朱鵬飛,陳柏,林尊琪;BBO晶體類相位匹配光參量放大理論分析[J];中國激光;2004年09期

4 劉軍,魏曉峰,黃小軍,陳慰宗,袁曉東,王曉東,曾小明,郭儀,呂志偉;BBO,LBO,KDP晶體光參量啁啾脈沖放大特性的比較研究[J];強激光與粒子束;2003年06期

5 許貴寶,王正平,杜晨林,傅琨,楊緒東,胡惠明,許心光,邵宗書;單軸晶非共線相位匹配研究[J];中國激光;2003年04期

6 冷雨欣,金石琦,彭家暉,楊曉東,徐至展;BBO晶體Ⅰ型非共線相位匹配參量放大研究[J];中國激光;2001年11期

7 朱鵬飛,錢列加,林尊琪;啁啾脈沖參量放大特性的數(shù)值模擬研究[J];強激光與粒子束;2001年04期

8 劉紅軍,陳國夫,趙衛(wèi),王濤,王屹山;非共線相位匹配LBO飛秒光參量放大器的理論分析[J];光子學(xué)報;2001年06期

9 夏江帆,魏志義,張杰;BBO晶體中非共線參量過程的帶寬與增益特性研究[J];物理學(xué)報;2000年02期

10 孫承緯;;磁驅(qū)動等熵壓縮和高速飛片的實驗技術(shù)(續(xù)4)[J];高能量密度物理;2006年02期

相關(guān)博士學(xué)位論文 前4條

1 孫啟兵;近紅外及中紅外波段激光非線性頻率變換技術(shù)研究[D];中國科學(xué)院研究生院(西安光學(xué)精密機械研究所);2010年

2 李曉莉;光學(xué)參量啁啾脈沖放大技術(shù)的研究[D];西安電子科技大學(xué);2010年

3 王紅英;光學(xué)參量啁啾脈沖放大技術(shù)研究[D];中國科學(xué)院研究生院（西安光學(xué)精密機械研究所）;2008年

4 馬晶;高重復(fù)率啁啾脈沖放大系統(tǒng)及飛秒光參量放大系統(tǒng)的研究[D];天津大學(xué);2005年

相關(guān)碩士學(xué)位論文 前6條

1 吳曉麗;差頻產(chǎn)生中紅外飛秒激光脈沖的研究[D];首都師范大學(xué);2009年

2 盧宗貴;光參量產(chǎn)生及其光譜特性理論研究[D];中國科學(xué)院研究生院（西安光學(xué)精密機械研究所）;2009年

3 馬云振;光參量圖像放大技術(shù)的理論與實驗研究[D];中國科學(xué)院研究生院（西安光學(xué)精密機械研究所）;2007年

4 宋嘯中;高重復(fù)率超寬帶光參量放大技術(shù)的理論與實驗研究[D];中國科學(xué)院研究生院（西安光學(xué)精密機械研究所）;2007年

5 劉華剛;寬帶光參量啁啾脈沖放大的研究[D];天津大學(xué);2007年

6 劉博;BBO晶體近紅外寬帶飛秒光參量放大的研究[D];天津大學(xué);2006年

，

本文編號：2048833