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【Digital Holography and 3D Imaging】
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Digital Holography and 3D Imaging
Novel 3D shape measurement method with lower occlusion for the bottom of cavity
Download:826次
Qingyang Wu
*
Baichun Zhang
Haixin Lin
Xiangjun Zeng
Zeng Zeng
Author Affiliations
Abstract
Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China
Because the bottom of the cavity has the shadow and occlusion, the angle between the projection system and imaging system is limited. So the traditional fringe projection technique based on the principle of optical triangulation is inapplicable. This Letter presents a 3D shape measurement method of using the light tube for the cavity. The method can measure an object from two opposite views at the same time, which means it will obtain two different groups of 3D data for the same object in a single measurement. The experimental results show the feasibility and validity of the 3D shape measurement method.
110.6880
Three-dimensional image acquisition
120.5050
Phase measurement
150.1488
Calibration
PDF全文
Full Text
Chinese Optics Letters
2016, 14(1): 010010
Digital Holography and 3D Imaging
Polarization conversions of diffractive wave plates based on orthogonal circular-polarization holography
Download:928次
Peng Cai
1
Jianhao Wang
2
Changshun Wang
1,*
Pengfei Zeng
1
Hongjing Li
1
Author Affiliations
Abstract
1
State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai 200062, China
A polarization holographic grating, which integrates the functions of a grating and a wave plate and is called a diffractive wave plate, is recorded by two beams (left and right circularly polarized) of a 532 nm laser in an azo polymer with a liquid-crystal structure. The polarization conversion characteristics of the diffractive wave plates are investigated with a detecting light of 650 nm by metering the polarization state of first-order diffracted light. It is confirmed that the diffractive wave plates convert the incident linear polarization into circular polarization for a linearly polarized probe laser and reverse the sense of rotation of the circular polarization when the detecting light is circularly polarized light.
090.0090
Holography
090.2880
Holographic interferometry
260.5430
Polarization
PDF全文
Full Text
Chinese Optics Letters
2016, 14(1): 010009
Digital Holography and 3D Imaging
Dual-wavelength digital holographic phase reconstruction based on a polarization-multiplexing configuration
Download:1104次
Zhe Wang
1,2
Yifei Chen
1,2
Zhuqing Jiang
1,2,*
Author Affiliations
Abstract
1
College of Applied Sciences, Beijing University of Technology, Beijing 100124, China
2
Institute of Information Photonics Technology, Beijing University of Technology, Beijing 100124, China
We present a polarization-multiplexing off-axis Mach–Zehnder configuration for dual-wavelength digital holography to achieve phase imaging in one shot. In this configuration, two orthogonal linear-polarized waves with respect to different wavelengths are employed to record respective holograms synchronously, where two recording waves transmit independently through the same optical paths of the interferometer, and by installing two analyzer polarizers each to filter off either of two wavelengths, and filtering through the other, the holograms are acquired, respectively, by a pair of CCDs at the same time. The unwrapped phase image of a grating with groove depth 7.1 μm is retrieved via spatial frequency filtering.
090.1995
Digital holography
090.5694
Real-time holography
PDF全文
Full Text
Chinese Optics Letters
2016, 14(1): 010008
Digital Holography and 3D Imaging
Demonstration of full-parallax three-dimensional holographic display on commercial 4 K flat-panel displayer
Frank C. Fan
*
Sam Choi
C. C. Jiang
Author Affiliations
Abstract
AFC Technology Co., Ltd., Shenzhen 518104, China
A novel method for a full-parallax three-dimensional (3D) holographic display by means of a lens array and a holographic functional screen is proposed. The process of acquisition, coding, restoration, and display is described in detail. It provides an efficient way to transfer the two-dimensional redundant information for human vision to the identifiable 3D display for human eyes. A holo-video system based on a commercial 4 K flat-panel displayer is demonstrated as the result.
090.2870
Holographic display
100.6890
Three-dimensional image processing
PDF全文
Full Text
Chinese Optics Letters
2016, 14(1): 010007
Digital Holography and 3D Imaging
Anisotropic edge enhancement in optical scanning holography with spiral phase filtering
Download:1050次
Kelly K. Dobson
1
Wei Jia
2,*
Ting-Chung Poon
1
Author Affiliations
Abstract
1
Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA
2
Lab of Information Optics and Optoelectronic Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Anisotropic edge enhancement is simulated using a spiral phase plate (SPP) in optical scanning holography (OSH). We propose to use a delta function and an SPP as the pupil functions to realize anisotropic edge enhancement. The interference of these two pupils is used to two-dimensionally scan an object to record its edge-only information. This is done in three ways: first, by shifting the SPP, second, by using two offset SPPs of same charge, and finally, by using two oppositely charged SPPs. Our computer simulations show the capability of selectively enhancing the edges of a given object.
100.2980
Image enhancement
090.1995
Digital holography
070.6110
Spatial filtering
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Chinese Optics Letters
2016, 14(1): 010006
Digital Holography and 3D Imaging
Time-division multiplexing holographic display using angular-spectrum layer-oriented method (Invited Paper)
Download:1137次
Yan Zhao
Liangcai Cao
*
Hao Zhang
Wei Tan
[ ... ]
Guofan Jin
Author Affiliations
Abstract
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
A time-division multiplexing method for computer-generated holograms (CGHs) is proposed to solve the problem of the limited space-bandwidth product. A three-dimensional (3-D) scene is divided into multiple layers at different depths. The CGH corresponding to each layer is calculated by an angular-spectrum algorithm that is effective at a wide range of propagation distances. All of the CGHs are combined into several group-CGHs. These group-CGHs are sequentially uploaded onto one spatial light modulator at a high frame rate. The space-bandwidth product can be benefited by the time-division processing of the CGHs. The proposed method provides a new approach to achieve high quality 3-D display with a fast and accurate CGH computation.
090.0090
Holography
090.1760
Computer holography
090.2870
Holographic display
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Chinese Optics Letters
2016, 14(1): 010005
Digital Holography and 3D Imaging
Generation and optical display of a binary-sampled phase-only hologram
Download:1097次
P. W. M. Tsang
1,*
Y.-T. Chow
1
T.-C. Poon
2,3
J.-P. Liu
3
Author Affiliations
Abstract
1
Department of Electronic Engineering, City University of Hong Kong, Hong Kong SAR, China
2
Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA
3
Department of Photonics, Feng Chia University, No. 100 Wenhwa Rd., Taichung 407, China
Past research has demonstrated that a phase-only hologram can be obtained by down-sampling the intensity image of the object scene prior to the generation of the hologram. In this Letter, we extend the method to the generation of binary phase-only holograms. A hologram derived with our proposed method is referred to as a binary-sampled phase-only hologram (BSPOH). Being different from the parent scheme, we have adopted an off-axis configuration in the generation of the BSPOH to avoid the quantization noise, the zeroth-order light, and the conjugate lights. An experimental evaluation reveals that the reconstructed image of the BSPOH is of good quality, and only contains slight amount of noise.
090.0090
Holography
090.1995
Digital holography
090.1760
Computer holography
PDF全文
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Chinese Optics Letters
2016, 14(1): 010004
Digital Holography and 3D Imaging
Progress on waveguide-based holographic video (Invited Paper)
Download:848次
S. McLaughlin
1
C. Leach
1
S. Gneiting
1
V. M. Bove
2
[ ... ]
D. E. Smalley
2,*
Author Affiliations
Abstract
1
Electroholography Group, Brigham Young University, 459 Clyde Building, Provo, Utah 84602, USA
2
MIT Media Laboratory, Massachusetts Institute of Technology, 77 Mass. Ave, Cambridge, Massachusetts 02139, USA
This paper presents progress on the characterization of guided-wave light modulators for use in a low-cost holographic video monitor based on the MIT scanned-aperture architecture. A custom-built characterization apparatus was used to study device bandwidth, RGB operation, and linearity in an effort to identify optimal parameters for high bandwidth, GPU-driven, full-color holographic display.
090.1705
Color holography
090.1970
Diffractive optics
090.2870
Holographic display
090.2890
Holographic optical elements
090.5694
Real-time holography
PDF全文
Full Text
Chinese Optics Letters
2016, 14(1): 010003
Digital Holography and 3D Imaging
Uncertainty, certainty, and relativity (Invited Paper)
Francis T. S. Yu
*
Author Affiliations
Abstract
Department of Electrical Engineering, Penn State University, University Park, PA 16802, USA
One of the most fascinating principles in quantum mechanics must be Heisenberg’s uncertainty principle, which can be briefly stated as follows: every physical observation cannot be precisely determined without some degree of error or uncertainty. And it is by no means can one use the principle within the limit of certainty region, as will be shown in this Letter. Two of the most important pillars in modern physics must be Einstein’s relativity theory and Schr dinger’s contribution to quantum mechanics. Yet, there is a profound connection between these discoveries by means of the uncertainty relationship, in which we shown that the observation of a high-speed object is conceivable if the speed of the observer keeps up with object’s speed.
000.1600
Classical and quantum physics
000.2690
General physics
PDF全文
Full Text
Chinese Optics Letters
2016, 14(1): 010002
Digital Holography and 3D Imaging
Spin dynamics of high-spin fermions in optical superlattices
Download:769次
Shaobing Zhu
1,2
Jun Qian
1
Yuzhu Wang
1,*
Author Affiliations
Abstract
1
Key Laboratory for Quantum Optics and Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
We investigate the spin dynamics, starting from the initial band-insulating state, of fermionic high-spin atoms in optical superlattices. Through numerical simulations and analytical calculations, we determine the time evolution behavior of the system. When the spin-changing strength and tunneling strength are comparable, the spin dynamics feature a spin-changing oscillation with the amplitude modulated by the superexchange interaction. When the double-well potential is very shallow, the spin dynamics feature a simple harmonic oscillation with the oscillation frequencies related only to the spin-changing strength, which can be properly explained with the perturbation model.
020.3320
Laser cooling
020.7010
Laser trapping
PDF全文
Full Text
Chinese Optics Letters
2017, 15(6): 060202
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