共查询到19条相似文献,搜索用时 109 毫秒
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一种获得大视角彩虹全息图的新方法:全息共轭法 总被引:2,自引:0,他引:2
提出一种利用全息相位共轭法获得大视角彩虹全息图的新方法,和全息聚光屏的概念.与一般彩虹全息法相比,全息相位共轭法所得彩虹全息图的视场不受透镜孔径的限制.简述了全息共轭法的基本原理,从理论上和实验上证明了该方法的可行性. 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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制作替代双棱镜的全息光学元件刘成森(辽宁师范大学物理系大连116022)全息光学元件在很多领域可以代替传统的玻璃光学元件(1),本文提出了一种制作可以代替玻璃双棱镜的全息光学元件的方法.光路如图1所示.其中L1、L2是柱透镜,它们将平行光会聚成狭缝状... 相似文献
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本文介绍了由不同焦距与不同衍射方向的全息透镜组合而成的一种新型全息元件。这种元件中的每个透镜具有相同的物方光轴和不同的象方光轴。它可以把物方空间沿光轴方向上的不同物距上的物面分别成像在对应的通道上,从而把一个三维物场变为多个二维像进行显示。文中给出了应用此元件对三线粒子场进行检测的初步结果。 相似文献
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Reconstruction resolution enhancement of EPISM based holographic stereogram with hogel spatial multiplexing 下载免费PDF全文
Yunpeng Liu 《中国物理 B》2022,31(4):44201-044201
We investigate how the splicing mode of a holographic element (hogel) affects the reconstruction of a 3D scene to improve the reconstruction resolution of a holographic stereogram fabricated using the effective perspective image segmentation and mosaicking method (EPISM). First, the effect of hogel spatial multiplexing on holographic recording and reconstruction is studied based on the mechanism of recording interference fringes in the holographic recording medium. Second, combined with the influence of multiple exposures on the hologram's diffraction efficiency, the diffraction efficiency of the holographic stereogram is analyzed in the spatial multiplexing mode. The holographic stereogram is then regarded as a special optical imaging system. The theory of spatial bandwidth product is adopted to describe the comprehensive resolution of the holographic stereogram, which explains why hogel spatial multiplexing can significantly improve the reconstruction resolution of a holographic stereogram. Compared with the traditional printing method under the same parameters in optical experiments, hogel spatial multiplexing has a lower diffraction efficiency but a higher quality of reconstructed image, consistent with the theoretical analysis. 相似文献
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Daisuke Sakai Kenji Harada Shun-ichi Kamemaru Mohamed A. El-Morsy Masahide Itoh Toyohiko Yatagai 《Optical Review》2005,12(5):383-386
We propose a direct fabrication of light diffusers using azobenzene polymer films. Holographic recordings of surface relief
diffusers are formed on the polymer film by exposure to an Nd:YAG laser (532 nm) through source diffusion materials. No post-treatment
is needed, and it can be erased by heating or irradiating uniform laser beam. Diffusion pattern can be controlled by the polarization
of the laser. Transmittance of over 88% is obtained at the wavelength of 633 nm. 相似文献
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用全息光学元件实现对眼睛的激光防护 总被引:6,自引:0,他引:6
反射式全息滤光片具有很好的滤光特性,可作为一种激光防护元件.本文对这种元件的波长选择性,角度选择性,所能承受的功率密度进行分析,并讨论了实际应用的可能性. 相似文献
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基于全息光学理论分析了全息光学元件的高斯成像性质,包括光焦度、成像位置、衍射效率以及作为光纤光谱仪光栅元件的可行性,并以全息光栅的成像理论以及光谱仪工作原理为基础,设计了光谱仪器光学系统的各个参数,通过Zemax软件的仿真、像质评价及优化,得出最终的参数和模拟结果。所使用的全息光栅记录波长为575 nm,记录光束之间的夹角为10,一束为平面波,一束为球面波,焦距40 mm,使用+1级衍射光,光栅孔径为10 mm。光谱仪的工作波长范围为400 nm~800 nm,体积140 mm*30 mm*40 mm,谱面展宽29.1 mm。通过在光学平台上搭建光路,利用已研发完成的电路系统及光谱仪软件,针对汞灯光谱进行了试验,光谱分辨率优于8 nm,测量得到的汞灯光谱与标准汞灯光谱一致,表明了所设计的基于全息元件的光纤光谱仪光学系统是可行的。 相似文献
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A novel laser time-of-flight flow sensor has been developed. A specially designed holographic optical element (HOE) constitutes the basis of the optical front end of the sensor. The multifunctional HOE maintains both the transmitting and receiving functions of the optical front end and is designed so that the alignment of the optical system is independent of small changes in the wavelength and temperature. This makes it possible to use a laser diode and makes the optical front end very compact and robust. The HOE is produced as a high-efficiency surface relief grating, thus making a large-scale production through polymer replication possible. The design and fabrication of the HOE is described and the stability of the sensor system is discussed with respect to wavelength variations. Direct calibration measurements on the sensor and test velocity measurements are presented. The sensor is intended for water flow measurements in pipes and can also be used for velocity measurements of solid surfaces. 相似文献
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本文从理论上分析了用全息方法制作具有象散特征的一种光学元件——象散全息元件——的可能性,并得到实验上的证明.对由象散全息元件在空间正交方向上产生的象散特性作了较为仔细的研究,给出了实验结果.若用此元件代替普通象散系统,将具有使用方便,经济等优点. 相似文献
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Ching-Cherng Sun Yau-Jen Chang Shih-Hsin Ma Tun-Chien Teng 《Optics Communications》2008,281(20):5126-5129
We propose and demonstrate a volume holographic optical element (VHOE) for signal-mode fiber coupling and the sending of conjugate waves of reference light for the construction of holographic elements. Given the inherent Bragg conditions of the VHOE, the angular tolerances of the conjugate reading light in both the horizontal and vertical directions are studied under different conditions. 相似文献
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描述全息立体图像像质的评价方法,包括1)像的逼真度;2)像的相对结构容量;3)相关品质;4)面积元法。 相似文献