49 results on '"Temporal multiplexing"'
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2. Recent Progress in Multiplexed Single-Photon Sources
- Author
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Peter Adam and Matyas Mechler
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heralded single-photon sources ,multiplexed single-photon sources ,spatial multiplexing ,temporal multiplexing ,spectral multiplexing ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
We review the progress in multiplexed single-photon sources, including overviews on heralded single-photon sources and photon-number-resolving detectors, the various approaches to multiplexing, and their successful experimental realizations. We also summarize the recent results on the theoretical description and optimization of multiplexed single-photon sources, focusing on the procedures and methods that enable the improvement of the performance of these sources.
- Published
- 2024
- Full Text
- View/download PDF
3. Full-Parallax Multiview Generation with High-Speed Wide-Angle Dual-Axis Scanning Optics.
- Author
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Heo, Daerak, Lim, Sungjin, Lee, Gunhee, Choi, Geunseop, and Hahn, Joonku
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DISTRIBUTION (Probability theory) ,WIGNER distribution ,PARALLAX ,OPTICS ,SCANNING systems - Abstract
Three-dimensional displays are receiving considerable attention owing to their ability to deliver realistic content. Particularly, a multiview display with temporal multiplexing offers advantages in terms of fewer restrictions for optical alignment and flexibility in forming view density. However, most of studies realize horizontal parallax-only multiview display. In a horizontal parallax-only multiview display the content is distorted in the vertical direction as the observer changes the viewing distance. It is helpful to understand this phenomenon using the Wigner distribution function (WDF). In this study, we divided the viewing zone (VZ) into the sub-viewing zone and integrated viewing zone according to the number of views of the observer. Specifically, the changes in the contents are experimentally evaluated at different viewing distances to validate our expectation. For the experiment, we implemented a full-parallax multiview display with spherical symmetry and designed a high-speed wide-angle dual-axis scanner. This scanner comprises two single-axis scanners connected by high numerical-aperture scanning optics. The proposed system and WDF analysis of VZ will be helpful to evaluate the characteristics of the multiview system. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
4. Full-Parallax Multiview Generation with High-Speed Wide-Angle Dual-Axis Scanning Optics
- Author
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Daerak Heo, Sungjin Lim, Gunhee Lee, Geunseop Choi, and Joonku Hahn
- Subjects
multiview display ,three-dimensional display ,temporal multiplexing ,dual-axis scanner ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Three-dimensional displays are receiving considerable attention owing to their ability to deliver realistic content. Particularly, a multiview display with temporal multiplexing offers advantages in terms of fewer restrictions for optical alignment and flexibility in forming view density. However, most of studies realize horizontal parallax-only multiview display. In a horizontal parallax-only multiview display the content is distorted in the vertical direction as the observer changes the viewing distance. It is helpful to understand this phenomenon using the Wigner distribution function (WDF). In this study, we divided the viewing zone (VZ) into the sub-viewing zone and integrated viewing zone according to the number of views of the observer. Specifically, the changes in the contents are experimentally evaluated at different viewing distances to validate our expectation. For the experiment, we implemented a full-parallax multiview display with spherical symmetry and designed a high-speed wide-angle dual-axis scanner. This scanner comprises two single-axis scanners connected by high numerical-aperture scanning optics. The proposed system and WDF analysis of VZ will be helpful to evaluate the characteristics of the multiview system.
- Published
- 2022
- Full Text
- View/download PDF
5. 33‐3: Viewing Angle Enhanced DMD Holographic Display with Reduced Speckle Noise.
- Author
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Lee, Byounghyo, Yoo, Dongheon, Jeong, Jinsoo, Lee, Dukho, and Lee, Byoungho
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HOLOGRAPHIC displays ,SPECKLE interference ,LIQUID crystal displays ,LIGHT modulators ,HOLOGRAPHY ,VISUAL aids - Abstract
Holographic displays give users a realistic experience by allowing them to perceive three‐dimensional (3D) images without any visual aids such as glasses. However, in a holographic display using liquid crystal based spatia/light modulator (LC‐SLM), the pixel pitch is not small enough so that the images are realized in limited areas. In addition, the slow framerate of LC‐SLM makes temporal multiplexing practically impossible. We propose holographic display using digital micromirror device (DMD) and apply temporal multiplexing method. The proposed system enhances viewing angle through temporally switched directional illuminations. Besides, the DMD's sufficient framerate provides significant reduction in speckle noise of holograms. We experimentally show the feasibility of proposed method by reconstructing holograms of 3D objects. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
6. Temporal Resolution Multiplexing: Exploiting the limitations of spatio-temporal vision for more efficient VR rendering.
- Author
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Denes, Gyorgy, Maruszczyk, Kuba, Ash, George, and Mantiuk, Rafal K.
- Subjects
HEADSETS ,IMAGE processing ,VIRTUAL reality ,BANDWIDTHS ,PHOTOMETRY - Abstract
Rendering in virtual reality (VR) requires substantial computational power to generate 90 frames per second at high resolution with good-quality antialiasing. The video data sent to a VR headset requires high bandwidth, achievable only on dedicated links. In this paper we explain how rendering requirements and transmission bandwidth can be reduced using a conceptually simple technique that integrates well with existing rendering pipelines. Every even-numbered frame is rendered at a lower resolution, and every odd-numbered frame is kept at high resolution but is modified in order to compensate for the previous loss of high spatial frequencies. When the frames are seen at a high frame rate, they are fused and perceived as high-resolution and high-frame-rate animation. The technique relies on the limited ability of the visual system to perceive high spatio-temporal frequencies. Despite its conceptual simplicity, correct execution of the technique requires a number of non-trivial steps: display photometric temporal response must be modeled, flicker and motion artifacts must be avoided, and the generated signal must not exceed the dynamic range of the display. Our experiments, performed on a high-frame-rate LCD monitor and OLED-based VR headsets, explore the parameter space of the proposed technique and demonstrate that its perceived quality is indistinguishable from full-resolution rendering. The technique is an attractive alternative to reprojection and resolution reduction of all frames. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
7. Diesel2p mesoscope with dual independent scan engines for flexible capture of dynamics in distributed neural circuitry
- Author
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Riichiro Hira, Che-Hang Yu, Jeffrey N. Stirman, Yiyi Yu, and Spencer L. Smith
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Microscope ,Computer science ,Science ,General Physics and Astronomy ,Bioengineering ,Temporal multiplexing ,Neural circuits ,Fluorescence ,Article ,Fluorescence imaging ,General Biochemistry, Genetics and Molecular Biology ,Multiphoton microscopy ,law.invention ,Calcium imaging ,law ,Biological neural network ,Premovement neuronal activity ,Computer vision ,Adaptive optics ,Multiphoton ,Neurons ,Flexibility (engineering) ,Microscopy ,Multidisciplinary ,business.industry ,Optical Imaging ,Neurosciences ,Brain ,Equipment Design ,General Chemistry ,DUAL (cognitive architecture) ,Microscopy, Fluorescence, Multiphoton ,Neurological ,Biomedical Imaging ,Calcium ,Artificial intelligence ,Nerve Net ,business ,Computer hardware - Abstract
Imaging the activity of neurons that are widely distributed across brain regions deep in scattering tissue at high speed remains challenging. Here, we introduce an open-source system with Dual Independent Enhanced Scan Engines for Large field-of-view Two-Photon imaging (Diesel2p). Combining optical design, adaptive optics, and temporal multiplexing, the system offers subcellular resolution over a large field-of-view of ~25 mm2, encompassing distances up to 7 mm, with independent scan engines. We demonstrate the flexibility and various use cases of this system for calcium imaging of neurons in the living brain., Imaging of neuronal activity across distant brain regions is challenging. Here, the authors introduce a two-photon microscope with two independently controlled scan engines, and demonstrate calcium imaging with subcellular resolution in brain regions up to 7 mm apart simultaneously.
- Published
- 2021
8. On the Performance of the Intel SR30 Depth Camera: Metrological and Critical Characterization.
- Author
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Carfagni, Monica, Furferi, Rocco, Governi, Lapo, Servi, Michaela, Uccheddu, Francesca, and Volpe, Yary
- Abstract
Specifically conceived for applications related to face analytics and tracking, scene segmentation, hand/finger tracking, gaming, augmented reality, and RGB-D cameras are nowadays used even as 3-D scanners. Despite depth cameras’ accuracy and precision are not comparable with professional 3-D scanners, they still constitute a promising device for reverse engineering (RE) applications in the close range, due to their low cost. This is particularly true for more recent devices, such as, for instance, the RealSense SR300, which promises to be among the best performing close range depth cameras in the market. Given the potentiality of this new device, and since to date a deep investigation on its performances has not been assessed in scientific literature, the main aim of this paper is to characterize and to provide metrological considerations on the Intel RealSense SR300 depth sensor when this is used as a 3-D scanner. To this end, the device sensor performances are first assessed by applying the existing normative guidelines (i.e. the one published by the Association of German Engineers - Verein Deutscher Ingenieure - VDI/VDE 2634) both to a set of raw captured depth data and to a set acquired with optimized setting of the camera. Then, further assessment of the device performances is carried out by applying some strategies proposed in the literature using optimized sensor setting, to reproduce “real life” conditions for the use as a 3-D scanner. Finally, the performance of the device is critically compared against the performance of latest short-range sensors, thus providing a useful guide, for researchers and practitioners, in an informed choice of the optimal device for their own RE application. [ABSTRACT FROM PUBLISHER]
- Published
- 2017
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9. 33‐3: Viewing Angle Enhanced DMD Holographic Display with Reduced Speckle Noise
- Author
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Byounghyo Lee, Byoungho Lee, Jinsoo Jeong, Dukho Lee, and Dongheon Yoo
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Physics ,Speckle pattern ,Optics ,law ,business.industry ,Holography ,Holographic display ,Speckle noise ,Temporal multiplexing ,Viewing angle ,business ,law.invention - Published
- 2020
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10. SimVis simulations of multifocal IOL designs based on public-literature data
- Author
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Xoana Barcala, Amal Zaytouny, Susana Marcos, Carlos Dorronsoro, Lucie Sawides, Carmen M. Lago, Alberto de Castro, European Commission, Agencia Estatal de Investigación (España), Instituto de Salud Carlos III, and Comunidad de Madrid
- Subjects
Temporal multiplexing ,Visual acuity ,Computer science ,medicine.medical_treatment ,Pupil diameter ,Intraocular lens ,Visual simulations ,Multifocal IOL designs ,Pupil ,Through-focus optical quality ,law.invention ,Lens (optics) ,MTF ,law ,Visual Strehl ,Optical transfer function ,medicine ,Optometry ,In patient ,Simultaneous vision ,medicine.symptom - Abstract
12 pags., 10 figs., As a large variety of intraocular lens (IOL) designs is commercially available in a growing market, selecting the best IOL for each patient has become a crucial task for a positive surgical outcome. Information about the measured or estimated performance of commercial lenses, as the through-focus modulation transfer function (TF-MTF) at a given frequency and pupil diameter, is routinely published. SimVis Gekko, a see-through simultaneous vision simulator based on temporal multiplexing, allows patients to experience the real world through different multifocal corrections prior to surgery. Implementing the maximum number of commercially available IOL designs into the portfolio of SimVis Gekko simulations is needed to provide a complete experience for the patients. We developed a new method to visually simulate IOL designs using temporal multiplexing, based only on publicly available information (mainly scientific literature or regulatory information), using the TF-MTF at 15cpd as input data to estimate the temporal coefficients that provide the best approximation to the real lens design. We validated the method with synthetic phase maps of equal area segmented bifocal and trifocal multifocal corrections for three pupil diameters of 3mm, 3.75mm and 4.5mm and applied it to three commercially available IOLs (trifocal or extended-depth-of-focus lenses). Through-focus visual acuity (TF-VA) curves were measured in seven patients using the SimVis simulations in the SimVis Gekko and matched, on average, the throughfocus VA measurements in patients with implanted IOLs, reported in the scientific literature (on average logMAR RMS error=0.05, corresponding to less than 3 letters of visual acuity charts)., We acknowledge financial support from the European Research Council ERC-2011-AdC 294099 (SM) from the Spanish Government FIS2017-84753R (SM), ISCIII DTS16/00127 (CD) and from Madrid Regional Government Doctorado Industrial IND2017/BMD-7670 (XB) and IND2018/BMD-9809 (CL)
- Published
- 2021
11. SimVis simulations of multifocal IOL designs based on public-literature data
- Author
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European Commission, Agencia Estatal de Investigación (España), Instituto de Salud Carlos III, Comunidad de Madrid, Sawides, L., Castro, Alberto de, Lago, Carmen M., Barcala, Xoana, Zaytouny, Amal, Marcos, Susana, Dorronsoro, Carlos, European Commission, Agencia Estatal de Investigación (España), Instituto de Salud Carlos III, Comunidad de Madrid, Sawides, L., Castro, Alberto de, Lago, Carmen M., Barcala, Xoana, Zaytouny, Amal, Marcos, Susana, and Dorronsoro, Carlos
- Abstract
As a large variety of intraocular lens (IOL) designs is commercially available in a growing market, selecting the best IOL for each patient has become a crucial task for a positive surgical outcome. Information about the measured or estimated performance of commercial lenses, as the through-focus modulation transfer function (TF-MTF) at a given frequency and pupil diameter, is routinely published. SimVis Gekko, a see-through simultaneous vision simulator based on temporal multiplexing, allows patients to experience the real world through different multifocal corrections prior to surgery. Implementing the maximum number of commercially available IOL designs into the portfolio of SimVis Gekko simulations is needed to provide a complete experience for the patients. We developed a new method to visually simulate IOL designs using temporal multiplexing, based only on publicly available information (mainly scientific literature or regulatory information), using the TF-MTF at 15cpd as input data to estimate the temporal coefficients that provide the best approximation to the real lens design. We validated the method with synthetic phase maps of equal area segmented bifocal and trifocal multifocal corrections for three pupil diameters of 3mm, 3.75mm and 4.5mm and applied it to three commercially available IOLs (trifocal or extended-depth-of-focus lenses). Through-focus visual acuity (TF-VA) curves were measured in seven patients using the SimVis simulations in the SimVis Gekko and matched, on average, the throughfocus VA measurements in patients with implanted IOLs, reported in the scientific literature (on average logMAR RMS error=0.05, corresponding to less than 3 letters of visual acuity charts).
- Published
- 2021
12. Temporal modulation for computational video cross-talk reduction.
- Author
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Park, Dookun, Samadani, Ramin, Tan, Kar-Han, and Gelb, Dan
- Abstract
Many recent prototypes for video collaboration, digital media sharing and gesture interfaces provide a video signal for display on a screen or surface and capture another video signal through the same screen or surface. The media captured in such systems, for transmission or for gesture user interfaces, needs to be separated from the displayed video. Otherwise, video cross-talk occurs. The prior, widely used temporal multiplexing avoids cross-talk by synchronizing camera capture with screen display so that the camera only captures when the screen does not display signal. This approach suffers from light loss (both displayed and captured) and increased display flicker due to the lower duty cycle of the displayed signal. This paper describes a new method, computational temporal modulation, that temporally modulates the displayed signal. The intentionally mixed signals captured by the camera are subsequently separated using computations. Our approach results in brighter display with less flicker and more signal captured by the camera. Experiments using a prototype collaboration system show good quality cross-talk reduction with light-weight real-time computation. [ABSTRACT FROM PUBLISHER]
- Published
- 2012
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13. Multi-User Autostereoscopic 2D/3D Switchable Flat-Panel Display.
- Author
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Yalan Xue and Yuanqing Wang
- Abstract
An autostereoscopic display system which can allow multiple users to see 3D perception of the images without loss of resolution is introduced in this paper. It is a kind of time-sequential 3D systems incorporating eye tracking and directional optical design to realize free viewing. The whole system consists of five main parts: multi-user eye tracker, direct-view LCD, steerable LED array, MCU controller, and a suit of directional optics. It employs the theory of temporal multiplexing by the use of a LCD available to run at 120 Hz and utilizes a multi-user eye tracker to get the viewers' eye positions so as to control the steerable backlight to produce multiple pairs of exit pupils to the viewers' eyes. This paper describes the detailed structure of the system, the operation principle and the results obtained are also described. This approach differs from many existing ones in that it is switchable between 2D and 3D mode both with full resolution and is much thinner compared to other bulky systems with a width less than 20 cm. [ABSTRACT FROM PUBLISHER]
- Published
- 2014
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14. 240 Hz OLED technology properties that can enable improved image quality.
- Author
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Hoffman, David M., Johnson, Paul V., Kim, Joohwan S., Vargas, Andy D., and Banks, Martin S.
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ORGANIC light emitting diodes , *LIGHT emitting diodes , *ORGANIC semiconductors , *IMAGE quality analysis , *IMAGE processing - Abstract
Large screen Organic Light Emitting Diode (OLED) technology is finally emerging as a technology ready for consumer use. OLED has a number of areas in which it can in principle be better than Liquid Crystal Displays (LCDs); two ways in particular are that OLED technology can achieve black levels that are much darker than LCDs, and the OLED pixels can switch extremely rapidly. These differences can permit OLED displays to outperform LCD under a number of conventional scenarios, but it can also enable some dramatically improved stereoscopic 3D (s3D) displays, including full-resolution temporal multiplexing with more than two views. In this paper, we review a set of experiments evaluating the strengths and weaknesses of OLED technology in general with a particular emphasis on understanding how the strengths of OLED technology can be leveraged to maximize the performance of an s3D display system. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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15. Performance of a temporally multiplexed single-photon source with imperfect devices
- Author
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Magnoni, Agustina G., López Grande, Ignacio H., Knoll, Laura T., and Larotonda, Miguel A.
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- 2019
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16. DMD-based time-multiplexed autostereoscopic display.
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Kupiec, S A and Markov, V B
- Subjects
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GRAPHICS processing units , *LIQUID crystal displays , *IMAGE analysis , *DIGITAL image processing , *MULTIPLEXING , *STEREOSCOPE - Abstract
The design of a multiperspective, 'look around' time-multiplexed autostereoscopic display featuring eight independent viewing zones is described. In order to achieve full-motion colour imagery, a novel high-framerate image projector, based on a digital micromirror display (DMD) with an interface capable of directly linking to commercial graphical processing units (GPUs), is utilised. A high-speed synchronised liquid-crystal display (LED)-based light engine is employed to allow for high-framerate sequential colour imagery. Real-time interactive rendering of multiperspective imagery with standard GPUs has been demonstrated. [ABSTRACT FROM AUTHOR] - Published
- 2011
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17. Design Methodology for High Brightness Projectors.
- Author
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Fournier, F. and Rolland, J.
- Abstract
The low luminance levels of light-emitting diodes (LEDs) compared to arc lamps make it difficult to design high-brightness LED-based projectors. Besides, the specificities of LEDs do not always allow using the same design schemes as with arc lamp-based projection displays. This paper performs a taxonomy of the techniques that can be used to increase the brightness of LED-based projection displays. We show that, in etendue-limited systems, the perceived brightness depends on the system etendue limit, the efficiency of the light engine, and the source luminance. The ability to improve each of these parameters depends on the design constraints. The system etendue limit can be increased at the expense of bulkier, more complex, and more expensive designs. The light engine efficiency can be increased by using free-form shape components adapted to the shapes and the emission patterns of the considered LEDs. The apparent source luminance can be increased at the expense of the flux by either recycling light or restricting the light collection to a smaller etendue with higher average luminance. Luminance can also be increased by using multiple color primaries (spatial multiplexing) or pulsed LEDs (temporal multiplexing). Finally, we review how light recycling can be implemented to convert polarization without increasing etendue. [ABSTRACT FROM PUBLISHER]
- Published
- 2008
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18. Compatibility of temporal multiplexed spatial light modulator with optical image processing
- Author
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Madec, Morgan, Uhring, Wilfried, Fasquel, Jean-Baptiste, Joffre, Pascal, and Hervé, Yannick
- Subjects
- *
IMAGE processing , *LIGHT modulators , *IMAGING systems , *INFORMATION processing - Abstract
Abstract: The tendency today is to replace high-dynamic light modulators by high-speed binary ones (of which the micromirror is the best example). This kind of spatial light modulators (SLM) fulfils all the present needs in displays. They are used in optical communications as binary systems and also in display applications (video projectors) with temporal multiplexing, in order to generate greyscale or colour images. In optical processing, and in the majority of coherent applications, temporal dithering introduces some distortions. In this paper, this point is studied with simulations. We point out that temporal multiplexing cannot be used in the Fourier plane. In the imaging plane, the distortion is weak if the filter has a positive impulse response. [Copyright &y& Elsevier]
- Published
- 2007
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19. Resolution of Temporal-Multiplexing and Spatial-Multiplexing Stereoscopic Televisions
- Author
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Joohwan Kim and Martin S. Banks
- Subjects
Computer science ,business.industry ,Image quality ,Significant difference ,Resolution (electron density) ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Stereoscopy ,Temporal multiplexing ,Multiplexing ,Atomic and Molecular Physics, and Optics ,Spatial multiplexing ,law.invention ,law ,Computer vision ,Artificial intelligence ,business ,Image resolution - Abstract
Stereoscopic (S3D) displays present different images to the two eyes. Temporal multiplexing and spatial multiplexing are two common techniques for accomplishing this. We compared the effective resolution provided by these two techniques. In a psychophysical experiment, we measured resolution at various viewing distances on a display employing temporal multiplexing, and on another display employing spatial multiplexing. In another experiment, we simulated the two multiplexing techniques on one display and again measured resolution. The results show that temporal multiplexing provides greater effective resolution than spatial multiplexing at short and medium viewing distances, and that the two techniques provide similar resolution at long viewing distance. Importantly, we observed a significant difference in resolution at the viewing distance that is generally recommended for high-definition television.
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- 2017
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20. Temporal Multiplexing of Heralded Single Photon Sources Using Optical Fiber Delays
- Author
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Eunjoo Lee, Sang Min Lee, and Hee Su Park
- Subjects
Physics ,Photon ,Optics ,Optical fiber ,business.industry ,law ,Temporal multiplexing ,business ,law.invention - Abstract
We demonstrate time-multiplexing of heralded single-photon sources using switchable optical fiber d elay l ines a ided b y p olarization-space m ultiplexing. Relative-multiplexing HOM interferometry tests the indistinguishability of output photons.
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- 2020
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21. High-Power Electro-Optically Controlled Divided-Pulse Amplification
- Author
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Henning Stark, Joachim Buldt, Jens Limpert, Arno Klenke, Michael Müller, and Andreas Tünnermann
- Subjects
Chirped pulse amplification ,business.industry ,Computer science ,Amplifier ,Temporal multiplexing ,Laser ,Multiplexing ,law.invention ,law ,Fiber laser ,Scalability ,Optoelectronics ,business ,Ultrashort pulse - Abstract
In the past years, novel approaches including chirped pulse amplification (CPA) [1] and advanced amplifier architectures such as large pitch fibers [2] have enabled a tremendous increase of the output performance of ultrafast lasers. Today, the potential of these techniques is well exploited. Thus, new technologies are developed, as, for instance, spatio-temporal coherent pulse combination [3], which is a promising and powerful tool, not least because of its scalability. Regarding temporal multiplexing, many different approaches exist [4, 5]. Rectently, a technique named electro-optically controlled divided-pulse amplification (EDPA) [6] has shown promising properties in initial proof-of-principle experiments.
- Published
- 2019
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22. Temporal multiplexing FRET: using single Tb-to-quantum dot pair distance-tuning (Conference Presentation)
- Author
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Niko Hildebrandt, Jiajia Guo, Carlos Mingoes, Xue Qiu, Jeffrey R. Deschamps, and Igor L. Medintz
- Subjects
Physics ,Presentation ,Förster resonance energy transfer ,Quantum dot ,business.industry ,media_common.quotation_subject ,Optoelectronics ,Temporal multiplexing ,business ,media_common - Published
- 2019
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23. Exploring Multiple and Coordinated Views for Multilayered Geospatial Data in Virtual Reality
- Author
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Patrick Le Callet, Vincent Tourre, Guillaume Moreau, Erwan J. David, Maxim Spur, Ambiances, Architectures, Urbanités (AAU), École Centrale de Nantes (ECN)-École nationale supérieure d'architecture de Nantes (ENSA Nantes)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)-École nationale supérieure d'architecture de Grenoble (ENSAG ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA), Centre de recherche nantais Architectures Urbanités (CRENAU ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA)-École Centrale de Nantes (ECN)-École nationale supérieure d'architecture de Nantes (ENSA Nantes)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)-École nationale supérieure d'architecture de Grenoble (ENSAG ), École Centrale de Nantes (ECN), Image Perception Interaction (IPI), Laboratoire des Sciences du Numérique de Nantes (LS2N), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Nantes (ECN)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Nantes (ECN)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-École Centrale de Nantes (ECN)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), and Université de Nantes (UN)-Université de Nantes (UN)-École Centrale de Nantes (ECN)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Geospatial analysis ,Computer science ,02 engineering and technology ,Temporal multiplexing ,Workspace ,Virtual reality ,computer.software_genre ,immersive analytics ,ddc:150 ,Stack (abstract data type) ,Human–computer interaction ,virtual environments and data visualization ,0202 electrical engineering, electronic engineering, information engineering ,[INFO.INFO-HC]Computer Science [cs]/Human-Computer Interaction [cs.HC] ,[SHS.ARCHI]Humanities and Social Sciences/Architecture, space management ,geospatial data visualization ,coordinated and multiple views ,lcsh:T58.5-58.64 ,lcsh:Information technology ,020207 software engineering ,Grid ,[INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR] ,Stereopsis ,Virtual machine ,020201 artificial intelligence & image processing ,computer ,Information Systems - Abstract
International audience; Virtual reality (VR) headsets offer a large and immersive workspace for displaying visualizations with stereoscopic vision, as compared to traditional environments with monitors or printouts. The controllers for these devices further allow direct three-dimensional interaction with the virtual environment. In this paper, we make use of these advantages to implement a novel multiple and coordinated view (MCV) system in the form of a vertical stack, showing tilted layers of geospatial data. In a formal study based on a use-case from urbanism that requires cross-referencing four layers of geospatial urban data, we compared it against more conventional systems similarly implemented in VR: a simpler grid of layers, and one map that allows for switching between layers. Performance and oculometric analyses showed a slight advantage of the two spatial-multiplexing methods (the grid or the stack) over the temporal multiplexing in blitting. Subgrouping the participants based on their preferences, characteristics, and behavior allowed a more nuanced analysis, allowing us to establish links between e.g., saccadic information, experience with video games, and preferred system. In conclusion, we found that none of the three systems are optimal and a choice of different MCV systems should be provided in order to optimally engage users.
- Published
- 2020
- Full Text
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24. Temporal Resolution Multiplexing: Exploiting the limitations of spatio-temporal vision for more efficient VR rendering
- Author
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Kuba Maruszczyk, Rafal Mantiuk, George Ash, Gyorgy Denes, Mantiuk, Rafal [0000-0003-2353-0349], and Apollo - University of Cambridge Repository
- Subjects
Computer science ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,02 engineering and technology ,Virtual reality ,perception ,Rendering (computer graphics) ,0202 electrical engineering, electronic engineering, information engineering ,Computer vision ,Graphics ,Image resolution ,Computer animation ,Temporal multiplexing ,business.industry ,Flicker ,graphics ,020207 software engineering ,Animation ,Frame rate ,Computer Graphics and Computer-Aided Design ,Visualization ,Temporal resolution ,Signal Processing ,virtual reality ,rendering ,Computer Vision and Pattern Recognition ,Artificial intelligence ,business ,Software - Abstract
Rendering in virtual reality (VR) requires substantial computational power to generate 90 frames per second at high resolution with good-quality antialiasing. The video data sent to a VR headset requires high bandwidth, achievable only on dedicated links. In this paper we explain how rendering requirements and transmission bandwidth can be reduced using a conceptually simple technique that integrates well with existing rendering pipelines. Every even-numbered frame is rendered at a lower resolution, and every odd-numbered frame is kept at high resolution but is modified in order to compensate for the previous loss of high spatial frequencies. When the frames are seen at a high frame rate, they are fused and perceived as high-resolution and high-frame-rate animation. The technique relies on the limited ability of the visual system to perceive high spatio-temporal frequencies. Despite its conceptual simplicity, correct execution of the technique requires a number of non-trivial steps: display photometric temporal response must be modeled, flicker and motion artifacts must be avoided, and the generated signal must not exceed the dynamic range of the display. Our experiments, performed on a high-frame-rate LCD monitor and OLED-based VR headsets, explore the parameter space of the proposed technique and demonstrate that its perceived quality is indistinguishable from full-resolution rendering. The technique is an attractive alternative to reprojection and resolution reduction of all frames.
- Published
- 2019
- Full Text
- View/download PDF
25. Single-Pulse Mueller Matrix Polarimeter Laboratory Demonstration
- Author
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Richard K. Martin, Khanh Nguyen, Arielle M. Adams, and Christian Keyser
- Subjects
Physics ,business.industry ,Single pulse ,Polarimeter ,Temporal multiplexing ,Laser ,law.invention ,Pulse (physics) ,Lidar ,Optics ,law ,Point (geometry) ,Mueller calculus ,business - Abstract
Motivated by a desire to reduce CSWAP, yet maintain high scan speed, we numerically and experimentally explore a new scanning LADAR architecture that employs temporal multiplexing to enable Mueller matrix measurement for each point in a scene with a single ns-scale illumination laser pulse.
- Published
- 2018
- Full Text
- View/download PDF
26. MesoScope Upgrade: Dual Plane Remote Focusing Imaging System for Recording of Ca2+ Signals in Neural Ensembles
- Author
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Dmitri A. Tsyboulski, Peter Saggau, Jérôme Lecoq, and Natalia Orlova
- Subjects
Upgrade ,Laser scanning ,Computer science ,Temporal resolution ,Electronic engineering ,Systems design ,Temporal multiplexing ,Multiplexing ,Dual plane - Abstract
We present a modification of a commercial imaging system known as MesoScope utilizing principles of temporal multiplexing and remote focusing to allow for simultaneous imaging from two regions of interest arbitrarily positioned in axial direction.
- Published
- 2018
- Full Text
- View/download PDF
27. On the Subspace Invariance of Population Responses
- Author
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Elaine Tring and Dario L. Ringach
- Subjects
0303 health sciences ,Population response ,Pure mathematics ,education.field_of_study ,Quantitative Biology::Neurons and Cognition ,genetic structures ,Population ,Temporal multiplexing ,Stimulus (physiology) ,Article ,03 medical and health sciences ,0302 clinical medicine ,Visual cortex ,medicine.anatomical_structure ,FOS: Biological sciences ,Quantitative Biology - Neurons and Cognition ,medicine ,Neurons and Cognition (q-bio.NC) ,Linear combination ,Neural coding ,education ,030217 neurology & neurosurgery ,Subspace topology ,030304 developmental biology ,Mathematics - Abstract
In cat visual cortex, the response of a neural population to the linear combination of two sinusoidal gratings (a plaid) can be well approximated by a weighted sum of the population responses to the individual gratings --- a property we refer to as {\em subspace invariance}. We tested subspace invariance in mouse primary visual cortex by measuring the angle between the population response to a plaid and the plane spanned by the population responses to its individual components. We found robust violations of subspace invariance arising from a strong, negative correlation between the responses of neurons to individual gratings and their responses to the plaid. Contrast invariance, a special case of subspace invariance, also failed. The responses of some neurons decreased with increasing contrast, while others increased. Altogether the data show that subspace and contrast invariance do not hold in mouse primary visual cortex. These findings rule out some models of population coding, including vector averaging, some versions of normalization and temporal multiplexing., 18 pages, 7 figures
- Published
- 2018
28. Six-pack off-axis holography
- Author
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Gili Dardikman, Simcha K. Mirsky, Natan T. Shaked, Nir A. Turko, and Moran Rubin
- Subjects
Wavefront ,Computer science ,business.industry ,Bandwidth (signal processing) ,Holography ,Magnification ,FOS: Physical sciences ,02 engineering and technology ,Temporal multiplexing ,021001 nanoscience & nanotechnology ,01 natural sciences ,Multiplexing ,Atomic and Molecular Physics, and Optics ,law.invention ,010309 optics ,Wavelength ,Optics ,law ,0103 physical sciences ,Spatial frequency ,0210 nano-technology ,business ,Physics - Optics ,Optics (physics.optics) - Abstract
We present a new holographic concept, named six-pack holography (6PH), in which we compress six off-axis holograms into a single multiplexed off-axis hologram without loss of magnification or resolution. The multiplexed hologram contains straight off-axis fringes with six different orientations, and can be generated optically or digitally. We show that since the six different complex wavefronts do not overlap in the spatial frequency domain, they can be fully reconstructed. 6PH allows more than 50% improvement in the spatial bandwidth consumption when compared to the best multiplexing method proposed so far. We expect the 6PH concept to be useful for a variety of applications, such as field-of-view multiplexing, wavelength multiplexing, temporal multiplexing, multiplexing for super-resolution imaging, and others.
- Published
- 2017
29. Indistinguishable heralded single photon generation via relative temporal multiplexing of two sources
- Author
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Xiang Zhang, Benjamin J. Eggleton, Chunle Xiong, Yee Hui Lee, Philip H. W. Leong, Terry Rudolph, and Bryn Bell
- Subjects
Photon ,0205 Optical Physics ,02 engineering and technology ,Temporal multiplexing ,01 natural sciences ,Multiplexing ,Synchronization ,law.invention ,Optics ,Two-photon excitation microscopy ,law ,0103 physical sciences ,1005 Communications Technologies ,010306 general physics ,Optical fiber cable ,Physics ,Science & Technology ,business.industry ,CHIP ,Visibility (geometry) ,CIRCUIT ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,QUANTUM STATES ,0906 Electrical and Electronic Engineering ,Physical Sciences ,Photonics ,0210 nano-technology ,business - Abstract
Generating N single photons simultaneously is a formidable challenge due to the lack of deterministic single photon sources. Recent work [New J. Phys. 19, 063013 (2017] has proposed a relative multiplexing scheme that can enhance the N single photons probability with a minimum of active switching resources. We experimentally demonstrate relative temporal multiplexing on two photon sources with a 90% additional enhancement over the standard temporal multiplexing scheme demonstrated previously. 88 ± 11% visibility of Hong-Ou-Mandel quantum interference verifies the indistinguishability of the heralded single photons after the synchronization. This proof-of-principle demonstration points out the potential significance of the relative multiplexing scheme for large-scale photonic quantum information processing.
- Published
- 2017
30. Optimized Temporal Multiplexing for Reservoir Computing with a Single Delay-Coupled Node
- Author
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Gordon Pipa, Hazem Toutounji, and Johannes Schumacher
- Subjects
Computer science ,business.industry ,Node (networking) ,Reservoir computing ,Temporal multiplexing ,business ,Statistical time division multiplexing ,Computer network - Published
- 2014
- Full Text
- View/download PDF
31. Vision with different presbyopia corrections simulated with a portable binocular visual simulator
- Author
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Carlos Dorronsoro, Aiswaryah Radhakrishnan, Daniel Pascual, Susana Marcos, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), European Commission, SCOAP, and Ministerio de Ciencia, Innovación y Universidades (España)
- Subjects
Male ,genetic structures ,Vision ,Social Sciences ,Intraocular Lens Implantation ,01 natural sciences ,Multiplexing ,Perceived quality ,0302 clinical medicine ,Medicine and Health Sciences ,Psychology ,Contrast (vision) ,Mathematics ,media_common ,High contrast ,Eye Lens ,Multidisciplinary ,Vision Tests ,Ophthalmic Procedures ,Middle Aged ,Optical Lenses ,Optical Equipment ,Telecommunications ,Engineering and Technology ,Medicine ,Sensory Perception ,Anatomy ,Research Article ,Adult ,Ocular Anatomy ,Science ,media_common.quotation_subject ,Equipment ,Surgical and Invasive Medical Procedures ,Temporal multiplexing ,010309 optics ,Young Adult ,03 medical and health sciences ,Ocular System ,0103 physical sciences ,medicine ,Humans ,Simulation ,Two-alternative forced choice ,Biology and Life Sciences ,Presbyopia ,medicine.disease ,eye diseases ,Binocular Vision ,030221 ophthalmology & optometry ,Eyes ,Focus (optics) ,Head ,Binocular vision ,Neuroscience ,Telescopes - Abstract
13 pags., 5 figs.-- Open Access funded by Creative Commons Atribution Licence 4.0, Presbyopes can choose today among different corrections to provide them with functional vision at far and near, and the outcomes and patient satisfaction depend on the selection. In this study, we present a binocular and portable vision simulator, based on temporal multiplexing of two synchronized tunable lenses allowing see-through and programmable visual simulations of presbyopic corrections. Seventeen binocular corrections were tested: 3 Monofocal (Far, Intermediate, Near), 4 Simultaneous Vision (bifocal, trifocal), 2 Monovision (far and near in either eye) and 8 Modified Monovision corrections (Simultaneous vision in one eye, Monofocal in the other eye). Perceived visual quality was assessed through the simulated corrections in 8 cyclopleged subjects who viewed a composite realistic visual scene with high contrast letters and a landscape at far (4 m) and a high contrast text at intermediate (66 cm) and near (33 cm) distances. Perceptual scores were obtained on a scale of 0 to 5 (low to high perceived quality). Perceptual preference was assessed by judging 36 random image pairs (6 repetitions) viewed through 9 binocular presbyopic corrections using two-interval forced choice procedures. The average score, across far and near distances, was the highest for Monovision (4.4±0.3), followed by Modified Monovision (3.4±0.1), Simultaneous Vision (3.0±0.1) and Monofocal corrections (2.9±0.2). However, the mean difference between far and near was lower for Simultaneous Vision and Monovision (0.4±0.1 PS) than Modified Monovision (1.8±0.7) or monofocal corrections (3.3±1.5). A strong significant correlation was found between the perceptual scores and the percentages of energy in focus, for each correction and distance (R = 0.64, p, This work was supported by: European Research Council under the European Union’s Seventh Framework Programme FP7/2007-2013, ERC Grant Agreement nº ERC-AdG-294099, Spanish Government grant FIS2014-56643-R to SM; ISCIII DTS16/00127 to CD; Spanish Government grant FIS2017-84753-R to CD and SM; and by 7th Framework Programme of the European Community through the Marie Curie
- Published
- 2019
- Full Text
- View/download PDF
32. Stereoscopic three-dimensional display with a fast-response liquid crystal polarization rotator
- Author
-
Man Chun Tseng, Hoi Sing Kwok, and Chung Yung Lee
- Subjects
Polarization rotator ,Materials science ,business.industry ,Response time ,Three dimensional display ,Stereoscopy ,Temporal multiplexing ,law.invention ,Optics ,Liquid crystal ,law ,Optoelectronics ,General Materials Science ,Electrical and Electronic Engineering ,business - Abstract
A stereoscopic three-dimensional (3D) system using a polarization rotator is proposed. The polarization rotator converts the polarizations of images from different eyes in temporal multiplexing. A novel fast nematic liquid crystal mode is also proposed. The new liquid crystal mode has a fast response time and a high contrast, and is thus a good candidate as a polarization rotator. The proposed 3D system uses only passive polarized glasses, which are more convenient, lightweight, and low-cost than what? In addition, the polarization rotator can be applied to current two-dimensional displays and can become 3D-capable displays.
- Published
- 2013
- Full Text
- View/download PDF
33. On the performance of the Intel SR300 depth camera: metrological and critical characterization
- Author
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Yary Volpe, Michaela Servi, Rocco Furferi, Lapo Governi, Francesca Uccheddu, and Monica Carfagni
- Subjects
Reverse engineering ,structured light ,Scanner ,Engineering ,device characterization ,Real-time computing ,SR300, depth camera, device characterization, VDI/VDE Normative, structured light, temporal multiplexing, Reverse Engineering ,02 engineering and technology ,computer.software_genre ,01 natural sciences ,Set (abstract data type) ,0202 electrical engineering, electronic engineering, information engineering ,Computer vision ,Electrical and Electronic Engineering ,Instrumentation ,VDI/VDE Normative ,temporal multiplexing ,business.industry ,010401 analytical chemistry ,SR300 ,depth camera ,0104 chemical sciences ,Finger tracking ,Analytics ,RGB color model ,020201 artificial intelligence & image processing ,Augmented reality ,Artificial intelligence ,business ,computer ,Structured light - Abstract
Specifically conceived for applications related to face analytics and tracking, scene segmentation, hand/finger tracking, gaming, augmented reality, and RGB-D cameras are nowadays used even as 3-D scanners. Despite depth cameras’ accuracy and precision are not comparable with professional 3-D scanners, they still constitute a promising device for reverse engineering (RE) applications in the close range, due to their low cost. This is particularly true for more recent devices, such as, for instance, the RealSense SR300, which promises to be among the best performing close range depth cameras in the market. Given the potentiality of this new device, and since to date a deep investigation on its performances has not been assessed in scientific literature, the main aim of this paper is to characterize and to provide metrological considerations on the Intel RealSense SR300 depth sensor when this is used as a 3-D scanner. To this end, the device sensor performances are first assessed by applying the existing normative guidelines (i.e. the one published by the Association of German Engineers - Verein Deutscher Ingenieure - VDI/VDE 2634) both to a set of raw captured depth data and to a set acquired with optimized setting of the camera. Then, further assessment of the device performances is carried out by applying some strategies proposed in the literature using optimized sensor setting, to reproduce “real life” conditions for the use as a 3-D scanner. Finally, the performance of the device is critically compared against the performance of latest short-range sensors, thus providing a useful guide, for researchers and practitioners, in an informed choice of the optimal device for their own RE application.
- Published
- 2017
34. Temporal multiplexing of heralded single photons with a resource-efficient fiber loop
- Author
-
Robert J. A. Francis-Jones, Peter J. Mosley, and Rowan A. Hoggarth
- Subjects
Physics ,Four-wave mixing ,Photon ,Optics ,business.industry ,Physics::Optics ,Temporal multiplexing ,Field-programmable gate array ,business ,Avalanche photodiode ,Optical switch ,Multiplexing ,Photonic-crystal fiber - Abstract
We have implemented resource-efficient active multiplexing that synchronises single photons generated by several consecutive pump pulses with a single optical switch. We demonstrate an increase in delivery probability per mode of heralded single photons.
- Published
- 2017
- Full Text
- View/download PDF
35. Color Dynamic Holographic 3D Displays: Approaches and Systems
- Author
-
Yongtian Wang
- Subjects
Spatial light modulator ,business.industry ,Computer science ,Holography ,Temporal multiplexing ,Stereo display ,Multiplexing ,law.invention ,law ,Computer graphics (images) ,Holographic display ,Computer vision ,Artificial intelligence ,business ,Coding (social sciences) - Abstract
The latest color dynamic holographic 3D displays developed in BIT are presented, where the amplitude-phase multiplexing coding method and the spatial and temporal multiplexing methods are employed. The SBP and the FOV of the display system approach 50 megapixels and 10.1°×7.3° respectively using a single phase-only spatial light modulator.
- Published
- 2017
- Full Text
- View/download PDF
36. Temporal multiplexing with adaptive optics for simultaneous vision
- Author
-
Eleni Papadatou, Antonio J. Del Águila-Carrasco, Norberto López-Gil, and Iván Marín-Franch
- Subjects
Visual acuity ,genetic structures ,Computer science ,Image quality ,medicine.medical_treatment ,Intraocular lens ,Temporal multiplexing ,Deformable mirror ,Article ,law.invention ,03 medical and health sciences ,0302 clinical medicine ,Optics ,law ,medicine ,Computer vision ,Adaptive optics ,business.industry ,Atomic and Molecular Physics, and Optics ,eye diseases ,Lens (optics) ,Spherical aberration ,030221 ophthalmology & optometry ,Artificial intelligence ,sense organs ,medicine.symptom ,business ,030217 neurology & neurosurgery ,Biotechnology - Abstract
We present and test a methodology for generating simultaneous vision with a deformable mirror that changed shape at 50 Hz between two vergences: 0 D (far vision) and −2.5 D (near vision). Different bifocal designs, including toric and combinations of spherical aberration, were simulated and assessed objectively. We found that typical corneal aberrations of a 60-year-old subject changes the shape of objective through-focus curves of a perfect bifocal lens. This methodology can be used to investigate subjective visual performance for different multifocal contact or intraocular lens designs.
- Published
- 2016
37. 11.3: Stereoscopic 3D Display by Fast Response Liquid Crystal Polarization Rotator
- Author
-
Man Chun Tseng, Tsz Kin Ho, Fion Sze Yan Yeung, Chung Yung Lee, and Hoi Sing Kwok
- Subjects
High contrast ,Polarization rotator ,Optics ,Materials science ,Liquid crystal ,business.industry ,law ,Optoelectronics ,Response time ,Stereoscopy ,Temporal multiplexing ,business ,law.invention - Abstract
A stereoscopic three-dimensional (3D) system using a polarization rotator is proposed. The polarization rotator converts the polarizations of different eyes' images in temporal multiplexing. A novel fast nematic liquid crystal mode is also proposed. The new liquid crystal mode has fast response time and high contrast; hence it is a good candidate for polarization rotator. The proposed 3D system utilizes only passive polarized glasses, which are more convenient, light weight and low cost. In addition, the polarization rotator can be applied to current 2D displays and become 3D capable display.
- Published
- 2012
- Full Text
- View/download PDF
38. DMD-based time-multiplexed autostereoscopic display
- Author
-
S A Kupiec and V B Markov
- Subjects
business.industry ,Computer science ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Temporal multiplexing ,Multiplexing ,GeneralLiterature_MISCELLANEOUS ,law.invention ,Rendering (computer graphics) ,Projector ,law ,Autostereoscopy ,Computer graphics (images) ,Media Technology ,Computer vision ,Computer Vision and Pattern Recognition ,Artificial intelligence ,business ,ComputingMethodologies_COMPUTERGRAPHICS - Abstract
The design of a multiperspective, ‘look around’ time-multiplexed autostereoscopic display featuring eight independent viewing zones is described. In order to achieve full-motion colour imagery, a novel high-framerate image projector, based on a digital micromirror display (DMD) with an interface capable of directly linking to commercial graphical processing units (GPUs), is utilised. A high-speed synchronised liquid-crystal display (LED)-based light engine is employed to allow for high-framerate sequential colour imagery. Real-time interactive rendering of multiperspective imagery with standard GPUs has been demonstrated.
- Published
- 2011
- Full Text
- View/download PDF
39. Multiplexing of Integrated Single Photon Sources
- Author
-
Benjamin J. Eggleton
- Subjects
Physics ,Physics::Popular Physics ,Four-wave mixing ,Photon ,Photonic crystal waveguides ,business.industry ,Physics::Optics ,Optoelectronics ,Temporal multiplexing ,Photonics ,Quantum information processing ,business ,Multiplexing - Abstract
We present recent progress on increasing the probability of heralded single photon generation from integrated photonic devices through active spatial and temporal multiplexing.
- Published
- 2016
- Full Text
- View/download PDF
40. Combining and Temporal Multiplexing of Four Pulsed Beams from Fiber Amplifiers by Means of Non-collinear Frequency Conversion in KTP Crystal
- Author
-
Kęstutis Regelskis, Julijanas Zeludevicius, and Gediminas Račiukaitis
- Subjects
Materials science ,Single beam ,business.industry ,Energy conversion efficiency ,02 engineering and technology ,Temporal multiplexing ,021001 nanoscience & nanotechnology ,01 natural sciences ,Multiplexing ,010309 optics ,Crystal ,Frequency conversion ,Optics ,Present method ,0103 physical sciences ,Fiber amplifier ,Physics::Accelerator Physics ,0210 nano-technology ,business - Abstract
We present method for combining multiple pulsed beams into frequency up-converted single beam, in which pulses are multiplexed in time. In proof-of-concept experiment we combine pulsed beams from four fiber amplifiers with 53% conversion efficiency.
- Published
- 2016
- Full Text
- View/download PDF
41. Experimental demonstration of multidimensional amplification of ultrashort pulses
- Author
-
Michael Müller, Tino Eidam, Andreas Tünnermann, Arno Klenke, Jens Limpert, and Marco Kienel
- Subjects
Physics ,Optics ,Multiphoton intrapulse interference phase scan ,business.industry ,Fiber amplifier ,Temporal multiplexing ,Division (mathematics) ,business ,Ultrashort pulse ,Multiplexing ,Pulse (physics) - Abstract
We demonstrate for the first time both spatial and temporal multiplexing in a scalable amplification scheme of ultrashort pulses. Using a division into two amplification channels and four pulse replicas high recombination efficiencies have been achieved at output energies far beyond the single-emitter damage threshold.
- Published
- 2015
- Full Text
- View/download PDF
42. Temporal multiplexing and shaping of few-cycle pulses with microoptical retroreflector arrays
- Author
-
Optische Nachrichtentechnik, Martin Bock, and Ruediger Grunwald
- Subjects
Physics ,business.industry ,Autocorrelation ,Optical processing ,Temporal multiplexing ,Atomic and Molecular Physics, and Optics ,Retroreflector ,Electronic, Optical and Magnetic Materials ,Pulse characteristics ,Tilt (optics) ,Optics ,Femtosecond ,business ,Instrumentation - Abstract
Temporal shaping of femtosecond pulses with microoptical retroreflector arrays was studied experimentally. It was demonstrated that pulses of variable duration and multiple pulses of variable delay can easily be generated by varying the tilt angle of the compact device. The corresponding pulse characteristics were determined by second order autocorrelation measurements.
- Published
- 2012
- Full Text
- View/download PDF
43. Noninvertibility, chaotic coding, and chaotic multiplexity of synaptically modulated neural firing
- Author
-
Yoram Baram
- Subjects
Discrete mathematics ,Neurons ,Quantitative Biology::Neurons and Cognition ,Cognitive Neuroscience ,Models, Neurological ,Chaotic ,Temporal multiplexing ,Fixed point ,Topology ,Properties of polynomial roots ,Arts and Humanities (miscellaneous) ,Attractor ,Animals ,Humans ,Neural Networks, Computer ,Neural coding ,Algorithms ,Coding (social sciences) ,Mathematics - Abstract
Widely accepted neural firing and synaptic potentiation rules specify a cross-dependence of the two processes, which, evolving on different timescales, have been separated for analytic purposes, concealing essential dynamics. Here, the morphology of the firing rates process, modulated by synaptic potentiation, is shown to be described by a discrete iteration map in the form of a thresholded polynomial. Given initial synaptic weights, a firing activity is triggered by conductance. Elementary dynamic modes are defined by fixed points, cycles, and saddles of the map, building blocks of the underlying firing code. Showing parameter-dependent multiplicity of real polynomial roots, the map is proved to be noninvertible. The incidence of chaos is then implied by the parameter-dependent existence of snap-back repellers. The highly patterned geometric and statistical structures of the associated chaotic attractors suggest that these attractors are an integral part of the neural code. It further suggests the chaotic attractor as a natural mechanism for statistical encoding and temporal multiplexing of neural information. The analytic findings are supported by simulation.
- Published
- 2011
44. Development of an Advanced Autostereoscopic Display Employing Temporal Multiplexing
- Author
-
Darrel G. Hopper, Stephen A. Kupiec, Vladimir Markov, Adrian Travis, and Gurdail Sani
- Subjects
Engineering ,Three dimensional imaging ,business.industry ,Autostereoscopy ,Electronic engineering ,High bandwidth ,Temporal multiplexing ,business ,Multiplexing ,ComputingMethodologies_COMPUTERGRAPHICS - Abstract
The development of an autostereoscopic display based upon temporally multiplexing is described. The advent of high framerate spatial light modulators, high performance graphical processing units and high bandwidth data buses render such a design viable.
- Published
- 2007
- Full Text
- View/download PDF
45. VHDL-AMS models of FLC for spatial light modulator virtual prototyping
- Author
-
Yannick Hervé, Wilfried Uhring, Morgan Madec, Olivier Rolland, Institut d'Electronique du Solide et des Systèmes (InESS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Jung, Marie-Anne
- Subjects
Engineering ,Spatial light modulator ,business.industry ,Image processing ,Temporal multiplexing ,VHDL ,Optical correlator ,Electronic engineering ,Liquid crystal cell ,VHDL-AMS ,business ,computer ,computer.programming_language ,Virtual prototyping - Abstract
A VHDL-AMS model of a surface-stabilized ferroelectric liquid crystal cell is presented in this paper. The model is based on the uniform FLC theory known since 1990. Although not quantitative, this approach gives us a good idea of the behaviour of such crystals. The model will be characterized and the results will be compared. Many related phenomena (effect of the temperature, ion transport...) will be introduced to complete the behavioural description. The purpose of this work is the design of virtual prototype for a high-speed spatial light modulator.
- Published
- 2006
46. Dynamic Computer Generated Holograms displayed on a Digital Micromirror Device™
- Author
-
Yeshaiahu Fainman, Laurent Bigue, and Pierre Ambs
- Subjects
business.industry ,Speckle reduction ,Computer science ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Holography ,Binary number ,Temporal multiplexing ,law.invention ,Digital micromirror device ,symbols.namesake ,Optics ,Amplitude ,Fourier transform ,law ,Computer graphics (images) ,symbols ,business ,Phase modulation - Abstract
Dynamic binary amplitude Fourier and Fresnel Transform Computer Generated Holograms are displayed on a Digital Micromirror Device. Temporal multiplexing enabled by its high speed of operation, allows speckle reduction and 3-D images reconstructions.
- Published
- 2002
- Full Text
- View/download PDF
47. Ultrahigh and persistent optical depths of alkali vapours for quantum memories in hollow-core photonic crystal fibers
- Author
-
Joshua Nunn, Amir Feizpour, Eilon Poem, Dylan J. Saunders, Benjamin Brecht, Ian A. Walmsley, Patrick M. Ledingham, and Krzysztof T. Kaczmarek
- Subjects
Hollow core ,Materials science ,business.industry ,Temporal multiplexing ,Alkali metal ,medicine.disease ,01 natural sciences ,Quantum memory ,010309 optics ,Optics ,0103 physical sciences ,Broadband ,medicine ,010306 general physics ,business ,Quantum ,Vapours ,Photonic-crystal fiber - Abstract
We show the highest (>105) and longest-lived (>3 hours) optical depths of alkali vapours in hollow-core photonic crystal fibres, which we will use to implement a novel noiseless broadband quantum memory scheme for temporal multiplexing.
48. Temporal multiplexing method with off-axis digital holography using acousto-optic modulators
- Author
-
Takashi Kakue, Tomoyoshi Ito, Tomoyoshi Shimobaba, and Wataru Anzai
- Subjects
business.industry ,Computer science ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Digital imaging ,Holography ,Temporal multiplexing ,Frame rate ,law.invention ,Optics ,law ,Image sensor ,business ,Holographic recording ,Digital holography - Abstract
We propose a temporal multiplexing method of two holograms based on off-axis digital holography using acousto-optic modulators. The proposed method can overcome the limitation of the frame rate of an image sensor for digital holography.
49. [Untitled]
- Subjects
Photon ,Computer science ,business.industry ,Physics::Optics ,Temporal multiplexing ,01 natural sciences ,Multiplexing ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Photonic crystal fibre ,010309 optics ,Resource (project management) ,Optics ,Single-photon source ,0103 physical sciences ,Electronic engineering ,Overhead (computing) ,010306 general physics ,business - Abstract
We present a multiplexed single photon source that re-synchronises heralded single photons generated by four-wave mixing in photonic crystal fibre using a fibre delay loop controlled by a single switch. By combining the probabilities of generating heralded single photons on four consecutive pump pulses we obtain an enhancement of the per-bin single-photon delivery probability. Our source demonstrates a way in which single-photon source multiplexing may be carried out with minimised resource overhead while retaining the benefits of a robust and alignment-free platform.
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