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chi20181129上海光机所韩申生557451Optical imaging and light controlling are two important themes of modern optics. Optical imaging includes traditional imaging (lens+camera), scanning imaging and computational imaging. Light controlling includes optical tweezer, laser processing, laser cooling, laser operation, holographic projection, etc. The realization of these techniques is based on the premise that light propagation is predictable and controllable. For example, in the holographic projection, the projected light field can be controlled by adjusting the phase distribution on the initial plane; while in the laser processing, the laser can be focused to a point by imposing a spherical phase to an incident plane wave. However, in many circumstances, the light will encounter scattering media during its propagation, such as biological tissues, ground glass, wall, paper and weathers with low visibility (rain, snow, fog, dust, etc.). Due to the random modulation of the scattering media, light coming out from them are irregular in phase and amplitude distributions, which poses a huge challenge to optical imaging and light controlling. Numerous techniques have been developed to address this issue, including ballistic imaging, diffusive optical tomography, photoacoustic tomography, wavefront shaping, optical phase conjugation, transmission matrix method, and some memory-effect-based techniques. The main work during my Ph.D. is focused on digital optical phase conjugation and memory effect. So, the content of this dissertation includes: 1. Ultrasound-encoded time-reversed light focusing inside scattering media. 2. Non-invasive three-dimension control of light between turbid layers using a surface quasi-point light source for precorrection. 3. Bidirectional image transmission through volumetric scattering media by digital optical phase conjugation.2019atalunwen219128214319279Scattering media; Optical imaging; Light controlling; Optical phase conjugation; Memory effectLight controlling and imaging through strong scattering media强散射环境中的光学成像及光场调控技术研究光学成像和光场调控是现代光学的两个十分重要的主题。光学成像包括传统成像(透镜+相机),扫描成像以及计算成像;而光场调控的应用包括光镊、激光加工、激光冷却、激光手术以及全息投影等。这些技术或应用得以实现的基础是光场传播的可预知性与可控性,例如,在全息投影中,只要控制了光场在初始面上的相位分布就可以控制传播后光场的分布;在扫描成像中,只要利用透镜对一个平面光施加一个球面相位,就可以将光场聚焦在一个焦点上。然而,在很多情况下光场在传播过程中会遇到散射介质,如生物组织、磨砂玻璃、墙壁、纸、以及各种能见度低的天气(云、雨、雪、雾、尘、霾等),理论上讲,只要是浅色且不透明的介质都是散射介质。由于散射介质对光场空间相位分布的调制是随机的,出射光场的分布会变的非常无规,因此成像与调控就变的非常困难。 近年来,科学家们提出了各种各样的技术来克服散射造成的光学成像和光场调控的障碍。这些技术包括弹道光技术、扩散光学成像技术、光声成像技术、波前整形技术、相位共轭光聚焦技术、传播矩阵技术、以及基于散射介质记忆效应的成像技术。这些技术各有各的优势和劣势以及适用环境,本论文的主要工作集中在光学相位共轭技术以及记忆效应上,主要内容包括: 1、 类生物体散射介质内的超声调制光聚焦技术。 2、 双层薄散射介质间的完全非侵入式三维光场调控。 3、 利用数字光学相位共轭技术以及记忆效应实现透过体散射介质的双向图像传递。散射介质;光学成像;光场调控;光学相位共轭;记忆效应中国科学院上海光学精密机械研究所乔木光学博士
中文题目: 强散射环境中的光学成像及光场调控技术研究
外文题目: Light controlling and imaging through strong scattering media
作者: 乔木
导师姓名: 韩申生
学位授予机构: 中国科学院上海光学精密机械研究所
答辩时间: 20181129
中文关键词:
散射介质;光学成像;光场调控;光学相位共轭;记忆效应
英文关键词:
Scattering media; Optical imaging; Light controlling; Optical phase conjugation; Memory effect
中文摘要:
英文摘要:
文献类型:学位论文
学位级别: 博士
正文语种: chi
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