共查询到20条相似文献,搜索用时 62 毫秒
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光横向传播的光折变体全息透镜设计及其衍射性质 总被引:3,自引:1,他引:2
提出了一种新型的可用于光束横向传播的光折变体全息透镜。该透镜是由入射方向相互垂直的一束平面波和一束球面波在双掺杂的铌酸锂晶体平板上记录形成的,它可以将垂直入射晶体平板的输入光束产生横向传输并聚焦,或对输入光点产生横传并准直输出。该透镜除了具有一般体全息透镜的稳定性好、可靠性高的特点外,特别具有光束横向传播的功能,因而具有空占比小、更易于整个光学透镜系统的微小化集成的优点。利用局域体全息的耦合波理论,计算了该透镜衍射光的振幅分布和衍射效率。计算了该透镜的焦面上的强度分布,并与理想球面波照射矩形孔径时焦面上的强度分布进行了比较。 相似文献
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用于全息存贮的全息散斑相移透镜 总被引:1,自引:0,他引:1
本文利用全息透镜和激光散斑的特性,提出一种专门用于信息存贮的全息散斑相移透镜。并给出了这种平面型光学元件的制作过程及实验结果。 相似文献
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高衍射效率闪耀全息透镜 总被引:1,自引:0,他引:1
提出一种制作位相全息透镜-闪耀全息透镜新设计,利用它可使位相全息透镜的位相分布类似位相菲涅耳透镜,其衍射效率理论值可达95%以上,但其制作过程要比位相菲涅耳透镜容易,文中给出了原理分析和实验验证,初步结果是令人满意的。 相似文献
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<正> 一、引言近年来,全息术的一个重要分支——全息光学元件(HOE)技术发展很快。国外已经把全息透镜应用于全息扫描器,全息头盔显示器等等。许多器件已经商品化。由于全息透镜是衍射元件,所以其色差是很严重的。为了减小色差,需用窄谱光源照明,限制了全息透镜的应用,国外许多学者都强调这一点。全息透镜是否能用于宽谱光源场合呢?70年代以来,国外一些学者在这方面进行了探讨,其中最吸引人的是J.N.Latta的工作。他运 相似文献
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X射线激光全息的可见光再现 总被引:2,自引:1,他引:1
X射线激光全息是X射线激光一个非常重要的应用。本文模拟了Gabor全息的记录和再现过程,分析了Gabor全息和无透镜傅立叶变换全息用可见光再现过程中再现象的放大率、象差等对再现象的影响,提出了减小象差和获得高分辨再现象的方法,认为无透镜傅立叶变换全息是当前X射线激光全息的重要记录方式。 相似文献
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介绍一种能将准直光束聚焦于一点的全息透镜结构。该透镜按可见光设计,用于近红外区。主要问题在于消除结构与使用波长之间漂移所引起的象差。 相似文献
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叙述了全息光学元件在全息激光防护镜、全息夜视镜、全息平视显视仪、全息头盔显示器、尚处于研制阶段的全息瞄准具及制导导弹系统的全息校正片和全息变焦透镜上的应用,说明了全息术在军事上有着广泛的用途(如军事目标模拟识别、军事训练、声波全息和全息雷达等),最后提出在制作全息片中存在的问题。 相似文献
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Chung J. Kuo 《Optical and Quantum Electronics》1993,25(10):761-770
Theoretical expressions and convergence conditions are developed here for the output of a feedback holographic associative memory. It is shown that a feedback holographic associative memory becomes a pinhole holographic associative memory under certain conditions, and thus is a generalization of the pinhole holographic associative memory. The crosstalk in the output of a feedback holographic associative memory can also be removed by a threshold device or controlled by the overall optical efficiency of the memory. A simulation is provided to verify the theoretical results shown here. Using the theoretical results and simulation verification, a feedback holographic associative memory can be designed efficiently. In addition, if a threshold device is used, optical elements with high optical efficiency can be used in a feedback holographic associative memory. 相似文献
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用递推制作方法可制作出像质优良的全息光学元件。首先用球面光路系统产生球面参考波,制作一块中间全息元件,然后用这块中间全息元件产生非球面参考波,制作出最终全息元件。本文阐述全息光学元件递推制作的数学摸型。 相似文献
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Rahul Bhatt Lata Mainali Gyanendra Bhatnagar Asha Sharma Arun K. Gupta 《Optics and Lasers in Engineering》2008,46(3):217-221
Conventional methods of measuring the various parameters of holographic optical elements are tedious for mass production. A novel approach is described for the holographic elements used in the holographic sight, in which the parameters are defined and measured as per their intended final application. Since the holographic sight is used for accurate target acquisition along with the other features, parallax in the sight becomes a critical parameter. Besides, the maximum brightness of the reticle is another parameter of the device, which is important for the use of sight in the strong sunlight in summers. There are two holographic elements, namely holographic reticle and holographic lens in the sight. Both can be tested in a simple set-up in terms of the parallax of the sight and the brightness of the reticle. The masters for both elements are required to be benchmarked once and rest of the elements in a mass production can be tested with the reference of masters. 相似文献
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用实时全息术研究低速变化过程的一种简易系统 总被引:7,自引:3,他引:4
研制了一种用于研究物体低速过程的简易系统,它由带有液门原位化学处理的实时全息干涉装置和具有连拍功能的相机以及一台氦氮激光器组成,是一种简易实用的“低速、实时全息干涉摄影系统”。用它记录了火箭推进剂样品在室温,常压下的燃烧过程,100瓦普通只灯逐级加压的点燃过程,对实时全息图的记录和处理采用了一种可获得高反衬度的新技术,拍摄的成功率高,干涉条纹的反衬度好,它为研究物体的低速变化过程提供了一种有力的手 相似文献
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高质量全息光栅实验系统研究 总被引:2,自引:1,他引:1
基于全息光栅在信息光学及光谱仪中的重要地位,对全息光栅进行了理论分析,提出了一种新的制作高质量全息光栅的实验系统.该实验系统的优点在于:将激光器发出的高斯光束改造成为均匀平面光波,以此平面光波作为光源可以制作出高质量的全息光栅. 相似文献
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This paper presents a method for recording and reconstructing high-quality digital color holographic images. The synthetic aperture technique is used to improve the resolution of the reconstructed image and also reduce the speckle size in the reconstruction plane. Subsequently, the multiple reference wave technique is used to suppress speckle noise in the reconstructed color holographic image by superposing speckle fields with different distributions. The final high-quality color holographic image is obtained due to the resolution improvement and speckle noise reduction achieved by the two techniques. Our method has potential applications in the digital color holographic displays. 相似文献
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Wai-Hon Lee 《Optics Communications》1980,34(1):29-31
Three approaches for recording holographic lenses for infrared wavelengths are discussed. For long wavelengths such as the 10.6 μm line from CO2 lasers holographic lenses are best made as computer-generated holograms. For the near infrared holographic lenses can be made using visible wavelengths with a computer-generated hologram to provide aberration correction. Finally a two step procedure is described which can be used to make holographic lenses for most infrared wavelengths. 相似文献
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Experimental Kodak 4-Z emulsion hypersensitized to infrared radiation has been successfully used for low spatial frequency off-axis holographic recording of a Nd-glass pulsed laser wavefront. The holographic recording system used was a modified Mach-Zehnder interferometer. 相似文献