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Research Articles
Recent Advances in Imaging of Light Propagation with Light-in-Flight Recording by Holography
Tomoyoshi Inoue 1,2Takashi Kakue 3Kenzo Nishio 4Toshihiro Kubota 5[ ... ]Yasuhiro Awatsuji 8,*
Author Affiliations
Abstract
1 Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki Goshokaido-cho, Sakyo-ku, Kyoto 606-8585, Japan.
2 Japan Society for the Promotion of Science, Kojimachi Business Center Building, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan.
3 Graduate School of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
4 Advanced Technology Center, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.
5 Kubota Holography Laboratory Corporation, Nishihata 34-1-609, Ogura-cho, Uji, Kyoto 611-0042, Japan.
6 Graduate School of System Informatics, Department of Systems Science, Kobe University, Rokkodai 1-1, Nada, Kobe 657-8501, Japan.
7 Center of Optical Scattering Image Science, Kobe University, Rokkodai 1-1, Nada, Kobe 657-8501, Japan.
8 Faculty of Electrical Engineering and Electronics, Kyoto Institute of Technology, Matsugasaki Goshokaido-cho, Sakyo-ku, Kyoto 606-8585, Japan.
In the last few decades, there have been several advances in ultrafast imaging of light propagation with light-in-flight recording by holography (LIF holography), which can capture light propagation as a motion picture with a single shot in principle. Here, we review the recent advances in LIF holography by considering the perspectives of various development of functional imaging techniques and evaluation of LIF holography with numerical simulation methods. The methods for recording multiple motion pictures such as a space-division multiplexing, a pixel-by-pixel-based space-division multiplexing, and an angular multiplexing technique are added extend the capability of LIF holography. The numerical simulation models used for investigating the image characteristics of LIF hologram are discussed. Finally, a summary and conclusion of recent advances in LIF holography is presented.
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Ultrafast Science
2023, 3(1): 0043
Diffraction, Gratings, and Holography
Real-time gradation-expressible amplitude-modulation-type electroholography based on binary-weighted computer-generated hologramDownload：548次
Ren Noguchi 1Kohei Suzuki 1Yoshiki Moriguchi 1Minoru Oikawa 2[ ... ]Naoki Takada 2,*
Author Affiliations
Abstract
1 Graduate School of Integrated Arts and Sciences, Kochi University, Kochi 780-8520, Japan
2 Research and Education Faculty, Kochi University, Kochi 780-8520, Japan
3 Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan
In amplitude-modulation-type electroholography, the binary-weighted computer-generated hologram (BW-CGH) facilitates the gradation-expressible reconstruction of three-dimensional (3D) objects. To realize real-time gradation-expressible electroholography, we propose an efficient and high-speed method for calculating bit planes consisting of BW-CGHs. The proposed method is implemented on a multiple graphics processing unit (GPU) cluster system comprising 13 GPUs. The proposed BW-CGH method realizes eight-gradation-expressible electroholography at approximately the same calculation speed as that of conventional electroholography based on binary computer-generated holograms. Consequently, we were able to successfully reconstruct a real-time electroholographic 3D video comprising approximately 180,000 points expressed in eight gradations at 30 frames per second.
gradation-expressible electroholography binary-weighted computer-generated hologram digital micromirror device computer-generated hologram 
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Chinese Optics Letters
2021, 19(11): 110501
Visual Optics and Displays
High-speed playback of spatiotemporal division multiplexing holographic 3D video stored in a solid-state drive using a digital micromirror deviceDownload：642次
Kohei Suzuki 1Minori Tao 2Yuki Maeda 1Hirotaka Nakayama 3[ ... ]Naoki Takada 4,*
Author Affiliations
Abstract
1 Graduate School of Integrated Arts and Sciences, Kochi University, Kochi 780-8520, Japan
2 Faculty of Science, Kochi University, Kochi 780-8520, Japan
3 National Astronomical Observatory of Japan, Tokyo 181-8588, Japan
4 Research and Education Faculty, Kochi University, Kochi 780-8520, Japan
5 Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan
We propose a high-speed playback method for the spatiotemporal division multiplexing electroholographic three-dimensional (3D) video stored in a solid-state drive (SSD) using a digital micromirror device. The spatiotemporal division multiplexing electroholography prevents deterioration in the reconstructed 3D video from a 3D object comprising many object points. In the proposed method, the stored data is remarkably reduced using the packing technique, and the computer-generated holograms are played back at high speed. Consequently, we successfully reconstructed a clear 3D video of a 3D object comprising approximately 1,100,000 points at 60 frames per second by reducing the reading time of the stored data from an SSD.
spatiotemporal division multiplexing electroholography digital micromirror device computer-generated hologram high-speed playback 
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Chinese Optics Letters
2021, 19(9): 093301
Holography
Real-time spatiotemporal division multiplexing electroholography for 1,200,000 object points using multiple-graphics processing unit clusterDownload：790次
Hiromi Sannomiya 1Naoki Takada 2,*Kohei Suzuki 1Tomoya Sakaguchi 1[ ... ]Tomoyoshi Ito 4
Author Affiliations
Abstract
1 Graduate School of Integrated Arts and Sciences, Kochi University, Kochi 780-8520, Japan
2 Research and Education Faculty, Kochi University, Kochi 780-8520, Japan
3 National Astronomical Observatory of Japan, Mitaka 181-8588, Japan
4 Graduate School of Engineering, Chiba University, Inage-ku 263-8522, Japan
Computationally, the calculation of computer-generated holograms is extremely expensive, and the image quality deteriorates when reconstructing three-dimensional (3D) holographic video from a point-cloud model comprising a huge number of object points. To solve these problems, we implement herein a spatiotemporal division multiplexing method on a cluster system with 13 GPUs connected by a gigabit Ethernet network. A performance evaluation indicates that the proposed method can realize a real-time holographic video of a 3D object comprising ～1,200,000 object points. These results demonstrate a clear 3D holographic video at 32.7 frames per second reconstructed from a 3D object comprising 1,064,462 object points.
real-time electroholography multiple-graphics processing unit cluster graphics processing unit spatiotemporal division multiplexing electroholography 
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Chinese Optics Letters
2020, 18(7): 070901
Holography
Real-time electroholography using a single spatial light modulator and a cluster of graphics-processing units connected by a gigabit Ethernet networkDownload：907次
Hiromi Sannomiya 1Naoki Takada 2,*Tomoya Sakaguchi 1Hirotaka Nakayama 3[ ... ]Tomoyoshi Ito 4
Author Affiliations
Abstract
1 Graduate School of Integrated Arts and Sciences, Kochi University, Kochi, Kochi 780-8520, Japan
2 Research and Education Faculty, Kochi University, Kochi, Kochi 780-8520, Japan
3 National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
4 Graduate School of Engineering, Chiba University, Chiba, Chiba 263-8522, Japan
Systems containing multiple graphics-processing-unit (GPU) clusters are difficult to use for real-time electroholography when using only a single spatial light modulator because the transfer of the computer-generated hologram data between the GPUs is bottlenecked. To overcome this bottleneck, we propose a rapid GPU packing scheme that significantly reduces the volume of the required data transfer. The proposed method uses a multi-GPU cluster system connected with a cost-effective gigabit Ethernet network. In tests, we achieved real-time electroholography of a three-dimensional (3D) video presenting a point-cloud 3D object made up of approximately 200,000 points.
real-time electroholography multiple-graphics processing unit cluster graphics processing unit gigabit Ethernet 
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Chinese Optics Letters
2020, 18(2): 020902
Holography
Real-time color holographic video reconstruction using multiple-graphics processing unit cluster acceleration and three spatial light modulatorsDownload：927次
Shohei Ikawa 1Naoki Takada 2,*Hiromitsu Araki 3Hiroaki Niwase 3[ ... ]Tomoyoshi Ito 5
Author Affiliations
Abstract
1 Faculty of Science, Kochi University, Kochi 780-8520, Japan
2 Research and Education Faculty, Kochi University, Kochi 780-8520, Japan
3 Graduate School of Integrated Arts and Sciences, Kochi University, Kochi 780-8520, Japan
4 Center for Computational Astrophysics, National Astronomical Observatory of Japan, Mitaka-shi 181-8588, Japan
5 Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan
We demonstrate real-time three-dimensional (3D) color video using a color electroholographic system with a cluster of multiple-graphics processing units (multi-GPU) and three spatial light modulators (SLMs) corresponding respectively to red, green, and blue (RGB)-colored reconstructing lights. The multi-GPU cluster has a computer-generated hologram (CGH) display node containing a GPU, for displaying calculated CGHs on SLMs, and four CGH calculation nodes using 12 GPUs. The GPUs in the CGH calculation node generate CGHs corresponding to RGB reconstructing lights in a 3D color video using pipeline processing. Real-time color electroholography was realized for a 3D color object comprising approximately 21,000 points per color.
color electroholography real-time electroholography multiple-graphics processing unit cluster graphics processing unit 
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Chinese Optics Letters
2020, 18(1): 010901
Holography
Color representation method using RGB color binary-weighted computer-generated hologramsDownload：705次
Masato Fujiwara 1Naoki Takada 2,*Hiromitsu Araki 1Shohei Ikawa 3[ ... ]Tomoyoshi Ito 4
Author Affiliations
Abstract
1 Graduate School of Integrated Arts and Sciences, Kochi University, Kochi 780-8520, Japan
2 Science Department, Natural Sciences Cluster, Research and Education Faculty, Kochi University, Kochi 780-8520, Japan
3 Faculty of Science, Kochi University, Kochi 780-8520, Japan
4 Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan
We propose a method for color electroholography using a simple red–green–blue (RGB) gradation representation method without controlling the respective brightness of the reference RGB-colored lights. The proposed method uses RGB multiple bit planes comprising RGB binary-weighted computer-generated holograms with various light transmittances. The object points of a given three-dimensional (3D) object are assigned to RGB multiple bit planes according to their RGB gradation levels. The RGB multiple bit planes are sequentially displayed in a time-division-multiplexed manner. Consequently, the proposed method yields a color gradation representation of a reconstructed 3D object.
090.1705 Color holography 090.1760 Computer holography 
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Chinese Optics Letters
2018, 16(8): 080901
Holography
Gradation representation method using a binary-weighted computer-generated hologram based on pulse-width modulationDownload：1022次
Masato Fujiwara 1Naoki Takada 2,*Hiromitsu Araki 1Chun Wei Ooi 3[ ... ]Tomoyoshi Ito 4
Author Affiliations
Abstract
1 Graduate School of Integrated Arts and Sciences, Kochi University, Kochi, 780-8520, Japan
2 Science Department, Natural Sciences Cluster, Research and Education Faculty, Kochi University, Kochi 780-8520, Japan
3 Faculty of Science, Kochi University, Kochi 780-8520, Japan
4 Graduate School of Engineering, Chiba University, Chiba, 263-8522, Japan
We propose a simple gradation representation method using a binary-weighted computer-generated hologram (CGH) to be displayed on a high-speed spatial light modulator that can be controlled by the pulse-width modulation technique. The proposed method uses multiple bit planes comprising binary-weighted CGHs with various pulse widths. The object points of a three-dimensional (3D) object are assigned to multiple bit planes according to their gray levels. The bit planes are sequentially displayed in a time-division-multiplexed manner. Consequently, the proposed method realizes a gradation representation of a reconstructed 3D object.
090.1760 Computer holography 090.0090 Holography 090.2870 Holographic display 
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Chinese Optics Letters
2017, 15(6): 060901
Holography
Fast time-division color electroholography using a multiple-graphics processing unit cluster system with a single spatial light modulatorDownload：1078次
Hiromitsu Araki 1Naoki Takada 2,*Shohei Ikawa 3Hiroaki Niwase 1[ ... ]Tomoyoshi Ito 5
Author Affiliations
Abstract
1 Graduate School of Integrated Arts and Sciences, Kochi University, Kochi, 780-8520, Japan
2 Science Department, Natural Sciences Cluster, Research and Education Faculty, Kochi University, Kochi 780-8520, Japan
3 Faculty of Science, Kochi University, Kochi 780-8520, Japan
4 Center for Computational Astrophysics, National Astronomical Observatory of Japan, Mitaka-shi 181-8588, Japan
5 Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan
We demonstrate fast time-division color electroholography using a multiple-graphics-processing-unit (GPU) cluster system with a spatial light modulator and a controller to switch the color of the reconstructing light. The controller comprises a universal serial bus module to drive the liquid crystal optical shutters. By using the controller, the computer-generated hologram (CGH) display node of the multiple-GPU cluster system synchronizes the display of the CGH with the color switching of the reconstructing light. Fast time-division color electroholography at 20 fps is realized for a three-dimensional object comprising 21,000 points per color when 13 GPUs are used in a multiple-GPU cluster system.
090.1705 Color holography 090.5694 Real-time holography 
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Chinese Optics Letters
2017, 15(12): 120902
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