共查询到19条相似文献,搜索用时 93 毫秒
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友清 《激光与光电子学进展》1994,31(9):32
采用光学扫描的实时全息术美国弗吉尼亚技术公司光学图象处理实验室的研究人员最近发展了一种实时光学全息记录技术。这种技术采用两束时变频率激光对“物体”两维扫描。用光电探测器收集并输出由含扫描物体振幅和相位信息散射所产生的外差电信号。此外差信号被解调并与扫... 相似文献
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偏振全息术在光学时钟分布中的应用 总被引:2,自引:0,他引:2
提出了采用偏振全息术制做全息光学元件以实现光学时钟分布的方法。初步实验得到了可作为4输出时钟分布的全息光学元件,文中还提出了用偏振全息术获得多输出端时钟分布的方案。 相似文献
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本文论述了限制X射线全息术分辨率的一些主要因素,在记录过程中,影响X射线全息术分辨率的主要因素是样品对X射线的衍射和相干散射、记录方式和X射线束的相干性。本文分别讨论了上述各因素和X射线全息术分辨率的关系,指出了X射线全息术和一般光学全息术的差别。在再现过程中,影响X射全息术分辨率的因素主要有两个,一个是探测工具的分辨率低于X射线全息图干涉条纹的空间频率,另一个是像差。本文着重讨论了在探测工具的分 相似文献
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微波显影的三维实时全息术在非线性介质或光折变介质中,用四波混频的实时光学全息术是一种有效的光信号处理法。过去十年所做的各种实验都证明全光信号处理的可能性,同时也暴露了实验局限性,本质上这是由非线性光学效应的固有弱点所造成。为了提供所需的开关能量,全光... 相似文献
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菲涅耳波带板在光学扫描全息术中的作用 总被引:1,自引:0,他引:1
本文研究了非运动卷积中的投影式卷积装置,并讨论了二函数在该装置中的卷积与解卷积过程,为了验证在光学扫描全息术中菲涅耳波板与物体波函数之间卷积的作用,本文利用投影式卷积装置实现了菲涅耳波带板与物体波函数之间的卷积与解卷积过程,文中给出了实验装置及实验结果。 相似文献
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本文论述了限制X射线全息术分辨率的一些主要因素.在记录过程中,影响X射线全息术分辨率的主要因素是样品对X射线的衍射和相干散射、记录方式和X射线束的相干性.本文分别讨论了上述各因素和X射线全息术分辨率的关系,指出了X射线全息术和一般光学全息术的差别.在再现过程中,影响X射线全息术分辨率的因素主要有两个,一个是探测工具的分辨率低于X射线全息图干涉条纹的空间频率,另一个是像差.本文着重讨论了在探测工具的分辨率高于X射线全息图干涉条纹空间频率的条件下像差和X射线全息图分辨率的关系,以及如何消除像差等间题. 相似文献
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邱传萍 《激光与光电子学进展》1984,21(1):41
苏联在全息术研究方面的计划雄心勃勃,并得到很好的资助,这一点与西方差不多。全息图和相干光学的研究工作主要在两个研究中心进行——约飞技术物理研究所和瓦维洛夫光学研究所。这两个研究中心在市区和郊区拥有许多楼房。本文主要介绍他们在相干光学和全息术方面的工作,虽然这两个中心在光学领域的许多方面很活跃,但约飞研究所还开展其他技术领域的工作。 相似文献
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随着近几年对光学全息术的进一步探索和研究,发现其在人工神经网络、高密度存储、光镊、信息编码译码和光束扭曲打结等方面有着广泛的应用,本文对全息术的原理及在现代光学中的应用做了简要介绍。 相似文献
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Optical scanning holography 总被引:2,自引:0,他引:2
Ting-Chung Poon Ming Hsien Wu Shinoda K. Suzuki Y. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1996,84(5):753-764
This paper provides a tutorial on the principles of holography, followed by a review of a newly developed 3-D imaging technique in which 3-D optical information of an object cam be extracted by a 2-D optical scan of the object. The technique is called optical scanning holography (OSH). In the context of optical scanning holography, we discuss some of its potential applications such as holographic information transmission and television (TV) system, 3-D image coding and decoding, 3-D microscopy, and 3-D optical remote sensing. In most cases, feasibility has been proven but awaits broader application 相似文献
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Fast Holographic Image Reconstruction Using Phase‐Shifting Assisted Depth Detection Scheme for Optical Scanning Holography
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For the implementation of a real‐time holographic camera, fast and automatic holographic image reconstruction is an essential technology. In this paper, we propose a new automatic depth‐detection algorithm for fast holography reconstruction, which is particularly useful for optical scanning holography. The proposed algorithm is based on the inherent phase difference information in the heterodyne signals, and operates without any additional optical or electrical components. An optical scanning holography setup was created using a heterodyne frequency of 4 MHz with a 500‐mm distance and 5‐mm depth resolution. The reconstruction processing time was measured to be 0.76 s, showing a 62% time reduction compared to a recent study. 相似文献
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为了测量相位物体的相位分布,提出了一种基于光学扫描全息系统测量相位物体相位分布的方法。该方法在原理上与以往传统测量方法有很大不同,它采用相干模式下的光学扫描全息系统,利用一个小孔探测器记录与相位物体的相位信息相关的数据,随后采用反演重建算法得到被测物体的相位分布。此外,对该方法的工作原理及重建效果进行了理论分析和模拟仿真,并分析了在记录和重建阶段所采用的小孔是非理想状态情况下,小孔对物体相位分布测量结果的影响。结果表明,用该方法测量相位物体的相位分布是可行的,并且可以获得很好的效果。 相似文献
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Since Leith and Upatnieks demonstrated the first optical hologram in 1964, hologram technology has attracted a great deal of interest in a wide range of optical fields owing to its potential use in future optical applications such as holographic imaging and optical data storage. Although there have been considerable efforts to develop holographic technologies using conventional optics, critical issues still hinder future development. Recently, metasurfaces composed of artificially fabricated subwavelength structures have been considered as novel holographic devices that show an unprecedented ability to control electromagnetic waves. In this review, we outline the recent progress in metasurface holography. A general introduction to several types of metasurface holography categorized based on their physics and application is provided. Then, our personal perspective on the future of this field is discussed. 相似文献
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This paper briefly reviews some aspects of holography and its application to acoustic imaging with an emphasis on concept. Included age discussions of the identity of holography, the principle of optical holography, holography applied to the acoustic domain and holography by linear detection, the applications of optical and acoustic holography, the concept and front-end embodiment of acoustic imaging systems that can be considered holographic, and the limitations of acoustic holography. This paper is intended to be tutorial and to provide discussions on relevant topics not covered by other papers in this issue on the subject of holography. 相似文献