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Articles de revues sur le sujet « Coherent Beam Multiplexing »

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Auteur : Grafiati

Publié le 14 mars 2023

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Feng, Y., R. Alonso-Mori, T. R. M. Barends, V. D. Blank, S. Botha, M. Chollet, D. S. Damiani et al. « Demonstration of simultaneous experiments using thin crystal multiplexing at the Linac Coherent Light Source ». Journal of Synchrotron Radiation 22, n^o 3 (10 avril 2015) : 626–33. http://dx.doi.org/10.1107/s1600577515003999.

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Multiplexing of the Linac Coherent Light Source beam was demonstrated for hard X-rays by spectral division using a near-perfect diamond thin-crystal monochromator operating in the Bragg geometry. The wavefront and coherence properties of both the reflected and transmitted beams were well preserved, thus allowing simultaneous measurements at two separate instruments. In this report, the structure determination of a prototypical protein was performed using serial femtosecond crystallography simultaneously with a femtosecond time-resolved XANES studies of photoexcited spin transition dynamics in an iron spin-crossover system. The results of both experiments using the multiplexed beams are similar to those obtained separately, using a dedicated beam, with no significant differences in quality.

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Boutet, Sébastien, Lutz Foucar, Thomas R. M. Barends, Sabine Botha, R. Bruce Doak, Jason E. Koglin, Marc Messerschmidt et al. « Characterization and use of the spent beam for serial operation of LCLS ». Journal of Synchrotron Radiation 22, n^o 3 (11 avril 2015) : 634–43. http://dx.doi.org/10.1107/s1600577515004002.

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X-ray free-electron laser sources such as the Linac Coherent Light Source offer very exciting possibilities for unique research. However, beam time at such facilities is very limited and in high demand. This has led to significant efforts towards beam multiplexing of various forms. One such effort involves re-using the so-called spent beam that passes through the hole in an area detector after a weak interaction with a primary sample. This beam can be refocused into a secondary interaction region and used for a second, independent experiment operating in series. The beam profile of this refocused beam was characterized for a particular experimental geometry at the Coherent X-ray Imaging instrument at LCLS. A demonstration of this multiplexing capability was performed with two simultaneous serial femtosecond crystallography experiments, both yielding interpretable data of sufficient quality to produce electron density maps.

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Wipfler, Alexander, Tiago Buckup et Marcus Motzkus. « Multiplexing single-beam coherent anti-stokes Raman spectroscopy with heterodyne detection ». Applied Physics Letters 100, n^o 7 (13 février 2012) : 071102. http://dx.doi.org/10.1063/1.3680209.

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Zhu, Diling, Yiping Feng, Stanislav Stoupin, Sergey A. Terentyev, Henrik T. Lemke, David M. Fritz, Matthieu Chollet et al. « Performance of a beam-multiplexing diamond crystal monochromator at the Linac Coherent Light Source ». Review of Scientific Instruments 85, n^o 6 (juin 2014) : 063106. http://dx.doi.org/10.1063/1.4880724.

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Zhang, Zhen, Emma Snively, Valery Dolgashev et Zhirong Huang. « Fast and flexible control of beam longitudinal phase space for high-repetition-rate x-ray free-electron lasers ». Review of Scientific Instruments 94, n^o 2 (1 février 2023) : 024706. http://dx.doi.org/10.1063/5.0135658.

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The wide-ranging requirements for the photon properties from multiple beamlines in superconducting based free-electron lasers (FELs) demand more challenging beam manipulation techniques. Shot-by-shot control of electron beam bunch length and peak current at high repetition rate up to megahertz is highly desired. In this paper, we present a comprehensive study of a method based on a 2-m-long normal conducting radio-frequency cavity to achieve fast and flexible control of beam compression and realize the full potential of the facility, including theoretical analysis, beam dynamics simulations, and conceptual cavity design for the Linac Coherent Light Source II and its high-energy upgrade. We illustrate the physical mechanism of the chirping cavity on the control of the final beam compression and propose methods to lower the requirements for the cavity parameters. The application of this method will allow tailored photon properties of individual beamlines to optimize their performance and drastically improve the multiplexing capabilities of a high-repetition rate FEL facility.

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Bernal, M.-P., G. W. Burr, H. Coufal, R. K. Grygier, J. A. Hoffnagle, C. M. Jefferson, R. M. Macfarlane, R. M. Shelby, G. T. Sincerbox et G. Wittmann. « Holographic-Data-Storage Materials ». MRS Bulletin 21, n^o 9 (septembre 1996) : 51–60. http://dx.doi.org/10.1557/s088376940003637x.

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In holographic data storage, a photo-sensitive medium is exposed to the interference pattern that is generated when an object beam, with an input data page encoded in the spatial profile of the beam, is intersected by a second, coherent laser beam. The photosensitive medium replicates these interference fringes as a change in optical absorption, refractive index, or thickness. Data are retrieved from the medium by exposing it to light from just one of the beams, which is then diffracted from the stored fringe pattern to reconstruct the other beam, including all the information that had been in the input data page. For a material of sufficient thickness, a large number of interference patterns, each identified by a different grating vector, can be stored or “multiplexed” in the same volume element, with negligible crosstalk between the individual interference patterns. Multiplexing of a large number of pages in the same volume element of the recording medium can be accomplished in several ways—for example by varying the angle between object and reference beam or the wavelength of both beams. Given no other limiting factors, the number of holograms that can be multiplexed in one volume element is directly proportional to the product of the thickness of the medium and its refractive index—that is, materials with optical thicknesses of the order of several millimeters are desirable.By its very nature, the holographic-storage mechanism distributes the stored information redundantly throughout the recording volume.

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Liu, Ning, Xuewen Wang, Jinpeng Yuan, Liantuan Xiao, Suotang Jia et Lirong Wang. « Manipulation of the orbital angular momentum via four-wave mixing in Rb vapor ». Laser Physics Letters 20, n^o 3 (31 janvier 2023) : 035204. http://dx.doi.org/10.1088/1612-202x/acb43d.

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Abstract The manipulation of the orbital angular momentum (OAM) contributes to understand the OAM multiplexing, is significant in free-space optical communication and information processing. We theoretically simulate and experimentally demonstrate the regularity of the OAM transfer, including the angular and radial modes, of Laguerre–Gaussian beam via four-wave mixing process in 85Rb vapor. The 420 nm coherent blue light output field inherits the phase characteristic of 780 nm and 776 nm beams with different OAM modes. The output field OAM modes show the transfer as a typical arithmetic operation of the input field OAM modes with equal-handed angular indice l, while, the conversion between angular and radial modes occurs with the opposite angular indice l. Such rules of the OAM transfer and manipulation have implications on the research of high-capacity information transfer and quantum communication.

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Stoupin, S., S. A. Terentyev, V. D. Blank, Yu V. Shvyd'ko, K. Goetze, L. Assoufid, S. N. Polyakov et al. « All-diamond optical assemblies for a beam-multiplexing X-ray monochromator at the Linac Coherent Light Source ». Journal of Applied Crystallography 47, n^o 4 (1 août 2014) : 1329–36. http://dx.doi.org/10.1107/s1600576714013028.

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A double-crystal diamond (111) monochromator recently implemented at the Linac Coherent Light Source (LCLS) enables splitting of the primary X-ray beam into a pink (transmitted) and a monochromatic (reflected) branch. The first monochromator crystal, with a thickness of ∼100 µm, provides sufficient X-ray transmittance to enable simultaneous operation of two beamlines. This article reports the design, fabrication and X-ray characterization of the first and second (300 µm-thick) crystals utilized in the monochromator and the optical assemblies holding these crystals. Each crystal plate has a region of about 5 × 2 mm with low defect concentration, sufficient for use in X-ray optics at the LCLS. The optical assemblies holding the crystals were designed to provide mounting on a rigid substrate and to minimize mounting-induced crystal strain. The induced strain was evaluated using double-crystal X-ray topography and was found to be small over the 5 × 2 mm working regions of the crystals.

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Jiang, Cheng, Hongpei Wang, Hongmei Chen, Hao Dai, Ziyang Zhang, Xiaohui Li et Zhonghui Yao. « Broadband Quantum Dot Superluminescent Diode with Simultaneous Three-State Emission ». Nanomaterials 12, n^o 9 (22 avril 2022) : 1431. http://dx.doi.org/10.3390/nano12091431.

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Semiconductor superluminescent light-emitting diodes (SLEDs) have emerged as ideal and vital broadband light sources with extensive applications, such as optical fiber-based sensors, biomedical sensing/imaging, wavelength-division multiplexing system testing and optoelectronic systems, etc. Self-assembled quantum dots (SAQDs) are very promising candidates for the realization of broadband SLED due to their intrinsic large inhomogeneous spectral broadening. Introducing excited states (ESs) emission could further increase the spectral bandwidth. However, almost all QD-based SLEDs are limited to the ground state (GS) or GS and first excited state (ES1) emission. In this work, multiple five-QD-layer structures with large dot size inhomogeneous distribution were grown by optimizing the molecular beam epitaxy (MBE) growth conditions. Based on that, with the assistance of a carefully designed mirror-coating process to accurately control the cavity mirror loss of GS and ESs, respectively, a broadband QD-SLED with three simultaneous states of GS, ES1 and second excited-state (ES2) emission has been realized, exhibiting a large spectral width of 91 nm with a small spectral dip of 1.3 dB and a high continuous wave (CW) output power of 40 mW. These results pave the way for a new fabrication technique for high-performance QD-based low-coherent light sources.

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Földes, I. B., et S. Szatmári. « On the use of KrF lasers for fast ignition ». Laser and Particle Beams 26, n^o 4 (18 septembre 2008) : 575–82. http://dx.doi.org/10.1017/s026303460800061x.

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AbstractThe KrF laser has been considered as an inertial fusion driver alternative to diode-pumped lasers. The possibilities of KrF lasers for fast ignition is supported by their short wavelength and the corresponding larger penetration depth together with the possible use of the same amplifiers for fusion driver and fast ignitor. It is shown that in the case of a fusion test facility both the energy and the intensity requirements can be fulfilled. A fast ignitor using 20 ps KrF pulses requires beam smoothing techniques after angular multiplexing due to the coherence of the beam. A multiple beam fast ignitor is suggested as an alternative in which a high number of beams of 1 ps duration are separately focused on the fuel after polarization demultiplexing. This arrangement allows even the pulse-forming of the ignitor.

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Zhao, Hongdong, Xiaocan Peng, Li Ma et Mei Sun. « Design of the multiplexing communication system with non-coherent vortex beams ». Optics Communications 378 (novembre 2016) : 5–9. http://dx.doi.org/10.1016/j.optcom.2016.05.012.

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Wan, Zhensong, Yijie Shen, Zhaoyang Wang, Zijian Shi, Qiang Liu et Xing Fu. « Divergence-degenerate spatial multiplexing towards future ultrahigh capacity, low error-rate optical communications ». Light : Science & ; Applications 11, n^o 1 (19 mai 2022). http://dx.doi.org/10.1038/s41377-022-00834-4.

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AbstractSpatial mode (de)multiplexing of orbital angular momentum (OAM) beams is a promising solution to address future bandwidth issues, but the rapidly increasing divergence with the mode order severely limits the practically addressable number of OAM modes. Here we present a set of multi-vortex geometric beams (MVGBs) as high-dimensional information carriers for free-space optical communication, by virtue of three independent degrees of freedom (DoFs) including central OAM, sub-beam OAM, and coherent-state phase. The novel modal basis set has high divergence degeneracy, and highly consistent propagation behaviors among all spatial modes, capable of increasing the addressable spatial channels by two orders of magnitude than OAM basis as predicted. We experimentally realize the tri-DoF MVGB mode (de)multiplexing and data transmission by the conjugated modulation method, demonstrating lower error rates caused by center offset and coherent background noise, compared with OAM basis. Our work provides a potentially useful basis for the next generation of large-scale dense data communication.

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Shri, Tanu, Anita Suman et Parveen Kumar. « Performance investigation of free space optics link employing polarization division multiplexing and coherent detection-orthogonal frequency division multiplexing under different link parameters ». Journal of Optical Communications, 24 août 2020. http://dx.doi.org/10.1515/joc-2020-0148.

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AbstractFree space optics (FSO) is a novel transmission technique capable of providing high-capacity links with large bandwidth and robustness against electromagnetic waves interference. In this work, we demonstrate the development of a 100 Gbps FSO link which employs the hybridization of polarization division multiplexing technique and coherent detection-orthogonal frequency division multiplexing technique. Further, we have investigated the system performance by varying different parameters like the input power, the size of the receiver antenna, wavelength of laser beam, the angle of beam divergence, and the additional losses. The proposed system has been modeled and analyzed over Optisystem test bed.

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Badraoui, Nada, et Tibor Berceli. « Enhancing capacity of optical links using polarization multiplexing ». Optical and Quantum Electronics 51, n^o 9 (septembre 2019). http://dx.doi.org/10.1007/s11082-019-2017-3.

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Abstract 5G mobile networks targets wireless connection capacity up to 10 Gb/s. For this purpose, we propose a method to considerably increase capacity. In this paper first, we show how to compensate the effects of polarization mode dispersion (PMD) in systems with double polarizations where PMD in such systems could cause fluctuations in optical transmission due to crosstalk and cross phase modulation. Second, we show how to enhance system capacity benefiting from polarization multiplexing (POL-MUX) technique which can provide double bandwidth efficiency. Based on the simulation results, we have achieved optimum system performance and we were able to reduce the PMD effect using pre- and post-compensation. We also have improved the POL-MUX technique using coherent detection in case of 16/64 QAM modulations. The results were achieved by implementing polarization controllers, polarization beam combiners and splitters, as well as polarization phase shifters.

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Zhong, Xiaoqing, Feihu Xu, Hoi-Kwong Lo et Li Qian. « Efficient experimental quantum fingerprinting with channel multiplexing and simultaneous detection ». Nature Communications 12, n^o 1 (22 juillet 2021). http://dx.doi.org/10.1038/s41467-021-24745-x.

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AbstractQuantum communication complexity explores the minimum amount of communication required to achieve certain tasks using quantum states. One representative example is quantum fingerprinting, in which the minimum amount of communication could be exponentially smaller than the classical fingerprinting. Here, we propose a quantum fingerprinting protocol where coherent states and channel multiplexing are used, with simultaneous detection of signals carried by multiple channels. Compared with an existing coherent quantum fingerprinting protocol, our protocol could consistently reduce communication time and the amount of communication by orders of magnitude by increasing the number of channels. Our proposed protocol can even beat the classical limit without using superconducting-nanowire single photon detectors. We also report a proof-of-concept experimental demonstration with six wavelength channels to validate the advantage of our protocol in the amount of communication. The experimental results clearly prove that our protocol not only surpasses the best-known classical protocol, but also remarkably outperforms the existing coherent quantum fingerprinting protocol.

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Huang, Hanzi, Haoshuo Chen, Yetian Huang, Qianwu Zhang, Jian Chen, Nicolas Keith Fontaine, Mikael Mazur, Roland Ryf et Yingxiong Song. « MIMO Processing with Linear Beat Interference Cancellation for Space Division Multiplexing Self-Homodyne Coherent Transmission ». Journal of Lightwave Technology, 2022, 1. http://dx.doi.org/10.1109/jlt.2022.3158689.

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Zhang, Yibo, Mengxing Ouyang, Aniruddha Ray, Tairan Liu, Janay Kong, Bijie Bai, Donghyuk Kim et al. « Computational cytometer based on magnetically modulated coherent imaging and deep learning ». Light : Science & ; Applications 8, n^o 1 (2 octobre 2019). http://dx.doi.org/10.1038/s41377-019-0203-5.

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Abstract Detecting rare cells within blood has numerous applications in disease diagnostics. Existing rare cell detection techniques are typically hindered by their high cost and low throughput. Here, we present a computational cytometer based on magnetically modulated lensless speckle imaging, which introduces oscillatory motion to the magnetic-bead-conjugated rare cells of interest through a periodic magnetic force and uses lensless time-resolved holographic speckle imaging to rapidly detect the target cells in three dimensions (3D). In addition to using cell-specific antibodies to magnetically label target cells, detection specificity is further enhanced through a deep-learning-based classifier that is based on a densely connected pseudo-3D convolutional neural network (P3D CNN), which automatically detects rare cells of interest based on their spatio-temporal features under a controlled magnetic force. To demonstrate the performance of this technique, we built a high-throughput, compact and cost-effective prototype for detecting MCF7 cancer cells spiked in whole blood samples. Through serial dilution experiments, we quantified the limit of detection (LoD) as 10 cells per millilitre of whole blood, which could be further improved through multiplexing parallel imaging channels within the same instrument. This compact, cost-effective and high-throughput computational cytometer can potentially be used for rare cell detection and quantification in bodily fluids for a variety of biomedical applications.

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