Bibliographies thématiques / Coherent Beam Multiplexing

Littérature scientifique sur le sujet « Coherent Beam Multiplexing »

Auteur : Grafiati

Publié le 14 mars 2023

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Articles de revues sur le sujet "Coherent Beam Multiplexing"

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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Actes de conférences sur le sujet "Coherent Beam Multiplexing"

Chandra, Suresh. « Laser beam combination using stimulated Brillouin scattering ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.mf10.

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This paper presents new ways in which stimulated Brillouin scattering (SBS) may be used to combine the outputs of several laser amplifiers to create a single coherent beam of high average power. The SBS produces optical phase conjugation which is characterized by (a) retroreflection of the incident beam and (b) correction of the wavefront distortions. Both properties are important for combining in the most useful manner the outputs of separate amplifiers. Three approaches to beam combining are discussed: (1) time multiplexing; (2) spatial multiplexing or phased arrays; and (3) serial combining. New conceptual designs are presented for each approach. The time multiplexing approach appears best suited when high pulse repetition rates are desired. The phased array approach provides the highest energy per pulse, while the third approach is rather flexible regarding the pulse repetition rate and laser pulse energy for a given average output power.

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Jenkins, B. K., A. R. Tanguay, S. Piazzolla, G. C. Petrisor et P. Asthana. « Photonic neural-network architecture based on incoherent-coherent holographic interconnections ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.mvv2.

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An adaptive neural-network architecture is presented that incorporates (1) a simultaneous incoherent/coherent holographic recording and reconstruction technique that permits simultaneous updates of all weights in a multiplexed volume holographic interconnection during each iteration of a neural learning algorithm1; (2) a double-angle multiplexing arrangement in which each pixel of the object-beam spatial light modulator (SLM) is illuminated by a set of mutually incoherent beams, each at a different angle; and (3) optoelectronic SLM's for the neural input and training planes, each with dualchannel inputs and outputs.2 The architecture incorporates modularity; capability for lateral, feedforward, and feedback interconnections in a multilayer network; effectively bipolar signals and weights; and capacity to implement a variety of network models and supervised or unsupervised learning algorithms. Results of computer simulations and laboratory experiments on selected aspects of the architecture will also be presented.

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Chao, T. H., et M. Chen. « Large capacity optical correlator by wavelength-angle multiplexing ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.the5.

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A novel approach of building a large capacity optical correlator using VanderLugt’s matched spatial filter is introduced in which a tunable dye laser is used as the coherent light source and a rotatable diffraction grating is placed at the input object plane. While sequentially rotating the grating about the optical axis and tuning the wavelength of the dye laser, the input signal spectrum is scanned along trajectories of concentric circles at the Fourier plane. With this 2-D scanning approach, the number of matched filters that can be built at the Fourier plane is greatly increased due to the more effective use of the system space-bandwidth product. In synthesizing the spatially multiplexed matched filters, a monochromatic laser is used instead of a dye laser since the latter generally does not provide adequate coherence length. To accommodate the wavelength shift between the filters recording and signal correlation detection, a compensation technique which includes the scaling of the signal spectrum and the reference beam angle according to the wavelength ratio is utilized during filter fabrication. This large capacity of the optical correlator can be effectively used with high speed and accuracy for multisignal detections with scale and orientation variations. Several illustrating experimental demonstrations of this correlation system using wavelength-angle multiplexing are presented.

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Asthana, P., G. Nordin, S. Piazzolla, A. R. Tanguay et B. K. Jenkins. « Analysis of interchannel cross talk and throughput efficiency in highly multiplexed fan-out-fan-in holographic interconnections ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fk6.

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Holographic optical interconnections have often been suggested for meeting the demanding requirements for high-density, independent weighted fan-out/fan-in interconnections imposed by advanced optical computing systems, such as neural networks. In this paper we consider the capabilities of a wide variety of previously proposed holographic interconnection schemes, as well as those of a recently proposed double angularly multiplexed incoherent/coherent architecture1 to perform the desired interconnection functions. Based on numerical simulations that use the optical beam propagation method and on experimental verification of selected aspects, we present results that compare the degree of interchannel crosstalk, the independence and accuracy of weighted outputs, the throughput efficiency, and the practicality of real-time reconfigurability. We show that fan-out/fan-in interconnection systems with single-reference-beam multiplexing suffer from significant crosstalk that is caused by a k-vector degeneracy in the beams fanned in to a given output node. This beam-degeneracy crosstalk, which is distinct from the grating-degeneracy crosstalk discussed previously,2 adversely affects the fidelity of the desired reconstructed weighted beams upon readout, even in the low-exposure (low-diffraction-efficiency) limit. We also verify, as is generally recognized, that fully coherent simultaneous recording introduces large weight distortions in the reconstructed output for both the coherent and incoherent readout cases. In comparison, however, we demonstrate that the double angularly multiplexed incoherent/coherent approach yields low weight distortion, allows simultaneous weight initiation and updates without coherent recording crosstalk effects, and permits incoherent summation at the output nodes with no incoherent fan-in loss.

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Moharam, M. G. « Angular selectivity of multiplexed holographic gratings ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.tub8.

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Holographic and surface-relief gratings are of wide interest due to their many applications in integrated optics, acoustooptics, holography, optical data and image processing, and spectral analysis. A significant number of recent applications, including optical interconnects, acoustooptical signal processing, multicolor display, wavelength multiplexing and demultiplexing, optical computing, associate storage, coherent beam addition, and beam coding, involve diffractive optical elements containing two or more multiplexed gratings. Recently, a rigorous coupled-wave analysis of multiplexed holographic gratings has been developed by the author. The analysis is applicable to multiplexed holographic gratings with arbitrary periodicity, slant angle, modulation, thickness, and incident plane wave with arbitrary polarization, angle of incidence, and light wavelength. In this work the angular selectivity characteristics of two multiplexed gratings are investigated using the coupled-wave analysis. In this study, both relatively thin (10-µm) photographic emulsion-type gratings and relatively thick (2-mm) photorefractive-type gratings are considered. The crosstalk and the minimum angle separation between the two gratings are determined for these typical gratings with low, intermediate, and high diffraction efficiency. In addition, the effect of the angle of incidence on the minimal angular separation between the two gratings is investigated.

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Duguay, Michel A. « Numerical modeling of remote coupling and switching in resonant and antiresonant planar waveguide structures ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.tub.2.

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Antiresonant reflecting optical waveguides (ARROW)1 support a leaky field which has been exploited for remote coupling and switching. We have modeled these devices using two methods. One method is based on modal interference where up to six modes are used to decompose the injected light beam. The other method is a geometrical approximation based on the coherent addition of rays reflecting and refracting at all the interfaces of the planar multiple-layer structure. We call this latter method RPM for ray propagation method. One geometry of particular interest is one where three light-guiding air layers are formed by the use of four 2-micron thick nitrocellulose pellicles. Mechanical motion of one of these pellicles by one micron suffices to efficiently switch light from one output port to the other. Another structure is designed in such a way so as to produce a wavelength-dependent switching ratio. This structure holds promise for wavelength division multiplexing applications in optical communications.

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Wang, Xiaolu, et Charles S. Ih. « Double-beam modulation for an optical MDM communication system ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.wx6.

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Microwave subcarrier multiplexing is potentially a practical and economical system for a local distribution and integrated services network (ISN). The novel microwave (subcarrier) division multiplexing (MDM) optical fiber communication system proposed here is implemented by utilizing two coherently related laser beams instead of just one, giving double-beam modulation (DBM). The beat of the two beams on detection by a photodetector automatically creates the required subcarriers. The major advantages of this DBM-MDM system are that extreme high frequency can be achieved; dispersion-induced harmonic and intermodulation distortions are essentially eliminated; the system is flexible for multichannel transmission and ISN; analog (video) and digital signals can be transmitted simultaneously; and transmitting and receiving frequencies can be easily electronically controlled and switched.

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Golub, Michael, Shoam Shwartz et Shlomo Ruschin. « Space-Division Multiplexing of Coherent Beams by Diffractive Optical Elements ». Dans National Fiber Optic Engineers Conference. Washington, D.C. : OSA, 2013. http://dx.doi.org/10.1364/nfoec.2013.jw2a.29.

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Oh, Dong-chan, Jae-yun Ko et Yong-hwan Lee. « Multi-user diversity and multiplexing with multiple coherent beams in wireless systems ». Dans 2006 IEEE International Conference on Communications. IEEE, 2006. http://dx.doi.org/10.1109/icc.2006.255572.

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Morgan, Kaitlyn, Yuan Li, Wenzhe Li, J. Keith Miller, Richard J. Watkins et Eric G. Johnson. « Spatial Quadrature Amplitude Multiplexing using Coherently Coupled Beams with Orbital Angular Momentum ». Dans 2018 IEEE Photonics Conference (IPC). IEEE, 2018. http://dx.doi.org/10.1109/ipcon.2018.8527083.

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