Готові списки джерел за темами / Finite coherence length

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Добірка наукової літератури з теми "Finite coherence length"

Автор: Grafiati

Опубліковано: 10 березня 2023

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Статті в журналах з теми "Finite coherence length"

Shinohara, Yuya, and Yoshiyuki Amemiya. "Effect of finite spatial coherence length on small-angle scattering." Journal of Applied Crystallography 48, no. 6 (October 13, 2015): 1660–64. http://dx.doi.org/10.1107/s160057671501715x.

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This study shows that forward scattering at the origin of reciprocal space contributes to the scattering intensity profiles of ultra-small-angle scattering. The forward scattering corresponds to a Fourier transform of the X-ray coherent volume on a sample. This contribution is usually ignored in the study of small-angle scattering, while it is fully considered in the fields of X-ray imaging, such as coherent X-ray diffraction imaging and X-ray ptychography. This effect is explicitly illustrated in the context of small-angle scattering, and the effect of a finite spatial coherence length on small-angle scattering is discussed.

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Jacoboni, Carlo, and Paolo Bordone. "Wigner transport equation with finite coherence length." Journal of Computational Electronics 13, no. 1 (October 2, 2013): 257–63. http://dx.doi.org/10.1007/s10825-013-0510-7.

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Baesens, C., and R. S. MacKay. "Finite coherence length for equilibrium states of generalized adiabatic Holstein models." Journal of Mathematical Physics 38, no. 4 (April 1997): 2104–14. http://dx.doi.org/10.1063/1.532197.

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Tomita, Makoto, and Hiroshi Ikari. "Influence of finite coherence length of incoming light on enhanced backscattering." Physical Review B 43, no. 4 (February 1, 1991): 3716–19. http://dx.doi.org/10.1103/physrevb.43.3716.

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Hayashi, Masahito, Kun Fang, and Kun Wang. "Finite Block Length Analysis on Quantum Coherence Distillation and Incoherent Randomness Extraction." IEEE Transactions on Information Theory 67, no. 6 (June 2021): 3926–44. http://dx.doi.org/10.1109/tit.2021.3064009.

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Gong, Zhiben, Yingjian Wang, and Yi Wu. "Finite temporal measurements of the statistical characteristics of the atmospheric coherence length." Applied Optics 37, no. 21 (July 20, 1998): 4541. http://dx.doi.org/10.1364/ao.37.004541.

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CRISAN, M., and I. GROSU. "BOSE–EINSTEIN QUASICONDENSATION IN 2D SYSTEMS." Modern Physics Letters B 19, no. 17 (July 30, 2005): 821–27. http://dx.doi.org/10.1142/s0217984905008852.

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We calculate the finite temperature correlation function, the coherence length and the critical temperature for a two-dimensional (2D) bosonic system, which presents the quasicondensation (a finite number of occupied states with p0≠0 momentum) effect at very low temperatures. This state, discovered experimentally, appear below a critical temperature for a finite number of particles.

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Rajput, B. S., and Sandeep Kumar. "Superconductivity due to Condensation of Monopoles around RCD Strings in SU(2) Gauge Theory." Advances in High Energy Physics 2010 (2010): 1–22. http://dx.doi.org/10.1155/2010/768054.

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The study of the condensation of monopoles and the resulting chromomagnetic superconductivity have been undertaken in restricted chromodynamics of SU(2) gauge theory. Constructing the RCD Lagrangian and the partition function for monopoles in terms of string action and the action of the current around the strings, the monopole current in RCD chromo magnetic superconductor has been derived and it has shown that in London' limit the penetration length governs the monopole density around RCD string in chromo magnetic superconductors while with finite (nonzero) coherence length the leading behavior of the monopole density at large distances from the string is controlled by the coherence length and not by the penetration length.

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BEATO, V., and H. ENGEL. "COHERENCE RESONANCE PHENOMENA IN AN EXCITABLE SYSTEM DRIVEN BY COLORED NOISE." Fluctuation and Noise Letters 06, no. 01 (March 2006): L85—L94. http://dx.doi.org/10.1142/s0219477506003173.

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We study the coherence of noise-induced excitations in a modified stochastic Oregonator model for the light-sensitive Belousov-Zhabotinsky (BZ) reaction assuming that the intensity of the applied illumination is a spatio-temporal stochastic field with finite correlation time and correlation length. For a single excitable element, we find coherence resonance (CR) with respect to the correlation time. In the spatially extended medium of diffusively coupled excitable elements, we observe CR for suitable combinations of the correlation time and length of the noise.

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Westfahl, Harry, Sérgio A. Lordano Luiz, Bernd C. Meyer, and Florian Meneau. "The coherent radiation fraction of low-emittance synchrotrons." Journal of Synchrotron Radiation 24, no. 3 (March 24, 2017): 566–75. http://dx.doi.org/10.1107/s1600577517003058.

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In this work the coherence properties of the synchrotron radiation beam from an X-ray undulator in a fourth-generation storage ring are analyzed. A slightly focused X-ray beam is simulated using a wavefront propagation through a non-redundant array of slits and the mutual coherence function is directly obtained and compared with the Gaussian–Schell approximation. The numerical wave propagation and the approximate analytical approaches are shown to agree qualitatively, and it is also shown that, when the coherent fraction is selected by a finite aperture before the focusing element, even achromatic focusing systems like total reflection mirrors become slightly chromatic. This effect is also well accounted for in the Gaussian–Schell model. The wavefront propagation simulation through the non-redundant array was repeated with an imperfect mirror demonstrating that, although the wavefront is distorted, its coherent length is practically unchanged.

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Більше джерел

Дисертації з теми "Finite coherence length"

GIOVANNINI, ELISA. "A Wigner Equation with Decoherence." Doctoral thesis, 2020. http://hdl.handle.net/2158/1238624.

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Dopo un’introduzione sui fondamenti matematici della Meccanica Quantistica e la sua formulazione wigneriana, si ricava un’equazione 1-dimensionale di Wigner con termine di decoerenza partendo dalla descrizione dettagliata di R. Adami, M. Hauray, C. Negulescu per la decoerenza di una particella pesante che interagisce con una particella leggera. Si mostra che il modello ottenuto ne contiene, quali casi particolari, altri già utilizzati per descrivere il fenomeno della decoerenza quantistica, come ad esempio l’equazione di Wigner–Fokker–Planck o le funzioni di Wigner con lunghezza di coerenza finita. Si indaga l’effetto della decoerenza sulla dinamica delle quantità macroscopiche (densità, corrente, energia) attraverso le corrispondenti leggi di bilancio. Si applica poi il modello ricavato ad una situazione di interesse fisico mediante simulazioni numeriche: un processo di tunneling in ambiente decoerente. Si investiga la questione asintotica per tempi lunghi nel caso di soluzioni gaussiane e si accenna al caso generale spazio omogeneo. Si mostra che l’aggiunta di un termine di frizione quantistica di tipo Caldeira-Legget all’equazione di Wigner con decoerenza è capace di realizzare il comportamento asintotico prevedibile sulla base di considerazioni di natura fisica.

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Частини книг з теми "Finite coherence length"

STARTSEV, A. I. "EFFECT OF FINITE COHERENCE LENGTH ON DYNAMICS OF NUCLEAR FISSION." In In the Intermissions…, 131–42. WORLD SCIENTIFIC, 1998. http://dx.doi.org/10.1142/9789812815941_0021.

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Prati, Francesco, Laura Gatto, Enrico Romagnoli, and Luca Di Vito. "Optical coherence tomography." In ESC CardioMed, 631–36. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0133.

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Frequency domain optical coherence tomography (FD-OCT) uses infrared light waves, providing intracoronary images at a high resolution and enabling the characterization of the structure and extent of coronary artery disease in unprecedented detail. OCT can study plaque components such as fibrous tissue, calcium, and lipids with high accuracy. Furthermore, the technique is potentially able to depict inflammatory cells, crystals of cholesterol, and intimal vasculature, and can clarify the mechanism of acute coronary syndromes. OCT is therefore the most promising technique to study plaque vulnerability. FD-OCT, with its ability to distinguish fresh thrombus from other tissues, can also identify culprit lesions in patients with acute coronary syndromes. Some studies are encouraging the adoption of an OCT-guided approach of stent deployment, showing the superiority versus an angiography-guided strategy. The assessment of plaque composition pre-intervention is instrumental for device selection. Identification and quantification of calcium is key to decide whether to perform direct stenting or to proceed with tissue ablation in the presence of massive calcifications. Furthermore, FD-OCT can be used to size stent length and diameter. After intervention recent data established the OCT metrics to be adopted to fine-tune stenting procedures.

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Prati, Francesco, Vito Ramazzotti, Laura Gatto, and Mario Albertucci. "Optical coherence tomography." In ESC CardioMed, 631–36. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0133_update_001.

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Frequency domain optical coherence tomography (FD-OCT) uses infrared light waves, providing intracoronary images at a high resolution and enabling the characterization of the structure and extent of coronary artery disease in unprecedented detail. OCT can study plaque components such as fibrous tissue, calcium, and lipids with high accuracy. Furthermore, the technique is potentially able to depict inflammatory cells, crystals of cholesterol, and intimal vasculature, and can clarify the mechanism of acute coronary syndromes. OCT is therefore the most promising technique to study plaque vulnerability. FD-OCT, with its ability to distinguish fresh thrombus from other tissues, can also identify culprit lesions in patients with acute coronary syndromes. Some studies are encouraging the adoption of an OCT-guided approach of stent deployment, showing the superiority versus an angiography-guided strategy. The assessment of plaque composition pre-intervention is instrumental for device selection. Identification and quantification of calcium is key in deciding whether to perform direct stenting or to proceed with tissue ablation in the presence of massive calcifications. Furthermore, FD-OCT can be used to size stent length and diameter. After intervention, recent data established the OCT metrics to be adopted to fine-tune stenting procedures.

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Okamoto, T., Y. Fujimoto, K. Toda, and I. Nezu. "Development of coherent structure and turbulence behind a finite-length emergent vegetation patch in open-channel flow." In River Flow 2014, 437–43. CRC Press, 2014. http://dx.doi.org/10.1201/b17133-63.

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Тези доповідей конференцій з теми "Finite coherence length"

Hayashi, Masahito, Kun Fang, and Kun Wang. "Finite Block Length Analysis on Quantum Coherence Distillation and Incoherent Randomness Extraction." In 2021 IEEE International Symposium on Information Theory (ISIT). IEEE, 2021. http://dx.doi.org/10.1109/isit45174.2021.9518135.

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Macfarlane, Duncan L., and Lee W. Casperson. "Coherence effects in a synchronously pumped mode-locked dye laser with a saturable absorber." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.mn8.

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We present a semiclassical model for a synchronously pumped mode-locked dye laser with a saturable absorber included in the cavity. This combination, called a hybridly mode-locked system, has the advantage of producing stable picosecond and subpicosecond pulses for long periods of operation. The particular system of interest is the practically realized rhodamine 6G laser with either DODCI or DQOCI as the saturable absorber. Our model may be solved numerically, and our computed results are presented in terms of the pulse autocorrelations, which are the parameters usually obtained in our experiments and in similar studies elsewhere. In addition to accounting for the finite coherence times of both dyes, our model also includes molecular orientation effects which reduce the efficiencies of the interactions. A key parameter of our model is the length mismatch between the dye laser and pump laser. The effect of this length detuning on the output pulse character is discussed. The pulse shaping and shortening caused by the saturable absorber are also emphasized.

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Holmes, J. Fred. "Speckle propagation through turbulence: its characteristics and effects." In Optical Remote Sensing. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/ors.1985.tub2.

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Atmospheric turbulence and target induced speckle can have a significant and deleterious effect on the performance of optical systems. The primary effect is to introduce a strong fluctuation in the intensity and a random perturbation of the phase of the fields at the optical receiver. This is equivalent to introducing a large noise source at the receiver; and consequently multiple samples and/or clever processing techniques are needed to accurately estimate the magnitude of the received intensity. In addition, for coherent detection schemes, the random phase and finite transverse coherence length introduced by the speckle and turbulence will limit the size of aperture that can be used. These characteristics of the speckle field after propagation through turbulence and its effect on optical systems will be discussed in a tutorial overview.

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Matic, Roy M., and Joseph W. Goodman. "Imaging system design for reducing the complexity of postdetection processing." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.mo7.

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Assume that an image acquired from a diffraction- limited system using partially coherent illumination is processed by a linear postdetection filter having a desired transfer function. The processing performed by an imaging system followed by a linear filter can be described by a bilinear transfer function. The problem is to design an equivalent system consisting of an apodized imaging system followed by a short-length finite impulse response (FIR) filter that has a bilinear transfer function that closely approximates the bilinear transfer function of the diffraction-limited imaging system followed by the ideal linear filter. The complexity of the postdetection filter is reduced since the FIR filter is presumably easier to implement than the ideal linear filter. Alternatively, a high-order FIR implementation of the ideal linear filter can be replaced by a lower-order implementation without loss of performance. Assuming that the coherence of the illumination is fixed, the problem reduces to finding the pupil screen of the imaging system and the weights of the FIR filter that result in the best approximation to the desired bilinear transfer function. The problem is solved using nonlinear parameter optimization techniques. The design of several equivalent systems is presented.

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White, Kenneth O., William M. Gutman, and James A. Dowling. "A Mobile Atmospheric Profiling System (MAPS)." In Optical Remote Sensing. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/ors.1985.tuc19.

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Atmospheric propagation tests in support of electro optics system development frequently require measurement of the atmospheric transmission at discrete frequencies or the average transmission for a finite spectral bandwidth. The conditions of the test may require that measurements be made over horizontal or slant paths, or even that a moving source be tracked. In many tests it is also necessary to acquire slant path atmospheric turbulence data. A measure of the transverse coherence length (ro), isoplanatic angle (θo), and/or turbulence structure constant (Cn2) profile, may be required. In order to address these needs, an extremely versatile Mobile Atmospheric Profiling System (MAPS) has been designed and fabricated. Field tests have been under way for several months and a variety of data has been collected.

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Jahoda, F. C., P. R. Forman, and C. B. Netterfield. "Multichannel phase conjugated multimode fiber interferometer." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.wy5.

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The motivation is replacement of numerous thermocouples on the vacuum liner of a magnetic confinement fusion experiment. Fiber optics′ advantages over hardwire include immunity from EMI, no voltage insulation requirements, and the capability of averaging temperature over finite lengths. Costs per channel are minimized by using a common light source, a common phase conjugator, and multimode fiber components. Phase conjugation permits multimode fibers to be used with single-mode fiber sensitivity. Each interferometer gets argonion laser light through a multimode star coupler arm spliced to the interferometer multimode 2×2 input coupler. One arm of each interferometer is piezoelectrically modulated at 20 kHz with amplitude of ~2.4-rad phase shift. Both arms have GRIN lens fiber terminations that project beams with 0.8-mm vertical displacements onto a self-pumped BaTiO3 phase conjugator. Three interferometer pairs can fit vertically on a 5-mm high crystal. An additional three pairs can be displaced horizontally on the same crystal with fiber lengths differing from the first three pairs by more than the laser coherence length to avoid phase crosstalk. Processing the detected light at two harmonics of the modulation frequency can give calibrated temperature-induced phase shifts unambiguously from fractional to multiple fringe counts.

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Cao, Guitao, He Zhu, and Guangdong Liu. "Study on Frequency and Time Domain Analysis of Flow-Induced Vibration Response of Core Barrel." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-91777.

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Abstract Different calculation methods of flow-induced vibration of the reactor vessel internals (RVI) are studied in this paper, that is frequency domain analysis and time domain analysis. Firstly, considering the fluid-structure interaction between the core barrel (CB) and the reactor pressure vessel (RPV), the CB and the heavy reflector, the finite element model of the CB in water is established and the results of its vibration characteristics are obtained, which is consistent with the test results. Based on the flow-induced vibration test of the RVI scale model, the fluctuating pressure data of the CB is obtained. The parameters such as power spectral density (PSD), correlation length and coherence function are obtained by processing the test data. Thus, the cross-power spectral density between any two points is got through these parameters. The root mean square (RMS) response of the CB is obtained by random vibration analysis (frequency domain). Then, the CFD model is established and large eddy simulation (LES) is used to obtain the time history of the fluctuating pressure of the CB. The response of the CB is obtained by time integration method (time domain). The calculation results by using these two methods are in good agreement with the experimental results.

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Yevick, David, and Bjorn Hermansson. "Use of the matrix beam propagation method in Y-junction and star-coupled laser arrays." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.wo3.

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In the first part of our presentation, we summarize our previous BPM results in integrated and fiber optics, semiconductor laser, coherence and coherent backscattering theory, and band-structure analysis. We also review our reformulation of the BPM in terms of matrix operators.1 The second half considers the application of the matrix algorithm to strongly coupled laser arrays. In particular, we calculate the band-structure associated with the higher-order supermodes of periodic Y-junction laser arrays of infinite transverse extent. Our results here demonstrate that while many salient properties of Y-junction array modes can be reproduced by simple models incorporating adiabatic lossless Y-junctions, the supermode gain displays several previously unreported features associated with the finite Y-junction lengths.

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Mattar, F. P., and Y. Claude. "Diffraction, dispersion, propagation, and coherent transient effects in unidirectional nonlinear ring cavity optical bistability." In International Laser Science Conference. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.thl60.

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We report the transient nonadiabatic generalization of Bonifacio-Lugiato1 cw nonlinear ring cavity optical bistability (NRCOB) with mirrors that ensure the necessary feedback. A semiclassical formalism is adopted, consisting of a paraxial wave equation coupled to the two-level sharp-line density matrix which includes detuning and relaxation times in conjunction with boundary conditions at the mirrors. The existing super-fluorescence finite difference code2 with radial variations of the Beer length has been modified to simulate the NRCOB with the free space propagation between the mirror treated with a finite Hankel series.3

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Takeuchi, Makoto, Koichi Tsujimoto, Toshihiko Shakouchi, and Toshitake Ando. "DNS of Turbulent Channel Flow With a Flexible Square Cylinder." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-24725.

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In the present paper in order to investigate possibility of flow control using elastic body, we conduct a simulation of a finite-length flexible cylinder installed in turbulent channel flow. For the flexible cylinder, the rigorous equation of motion for elastic continuum is solved with a finite volume method; the effect of existence of cylinder in the flow computation is taken into account using the immersed boundary method. From instantaneous and time averaged flow quantities, we demonstrate that the flexible cylinder markedly modulates the wake structure depending on the elasticity of cylinder. Further in order to extract coherent structures, the DMD (dynamic mode decomposition) method are applied. The primary flow structures in the wake of cylinder are demonstrated.

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