Готові списки джерел за темами / Optical wave synthesis

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Добірка наукової літератури з теми "Optical wave synthesis"

Автор: Grafiati

Опубліковано: 30 листопада 2024

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Статті в журналах з теми "Optical wave synthesis"

Mills, D. W., and L. S. Tamil. "Synthesis of guided wave optical interconnects." IEEE Journal of Quantum Electronics 29, no. 11 (1993): 2825–34. http://dx.doi.org/10.1109/3.248942.

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Smokal, Vitaliy, Oksana Krupka, Aleksey Kolendo, Beata Derkowska, Robert Czaplicki, and Bouchta Sahraoui. "Synthesis, polymerization ability, nonlinear optical properties of methacrylic monomers and polymers with benzylidene moiety." Chemistry & Chemical Technology 1, no. 3 (September 15, 2007): 131–35. http://dx.doi.org/10.23939/chcht01.03.131.

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New methacrylic monomers, their polymers with benzylidene fragment were synthesized. Structures of all compounds were determined by HNMR, UV- spectroscopies. The third order nonlinear optical properties of oxazolone, thiazolidinone and thiohydantoin containing compounds were investigated in solutions using degenerate four wave mixing (DFWM) method at 532 nm.

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Khaefi, Sara, Alireza Mallahzadeh, and Mohammad Hossein Amini. "Flat-topped pattern synthesis of optical leaky-wave antennas." Optics Communications 485 (April 2021): 126737. http://dx.doi.org/10.1016/j.optcom.2020.126737.

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Jiang, Zhi Hao, Jeremy P. Turpin, Kennith Morgan, Bingqian Lu, and Douglas H. Werner. "Spatial transformation-enabled electromagnetic devices: from radio frequencies to optical wavelengths." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2049 (August 28, 2015): 20140363. http://dx.doi.org/10.1098/rsta.2014.0363.

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Transformation optics provides scientists and engineers with a new powerful design paradigm to manipulate the flow of electromagnetic waves in a user-defined manner and with unprecedented flexibility, by controlling the spatial distribution of the electromagnetic properties of a medium. Using this approach, over the past decade, various previously undiscovered physical wave phenomena have been revealed and novel electromagnetic devices have been demonstrated throughout the electromagnetic spectrum. In this paper, we present versatile theoretical and experimental investigations on designing transformation optics-enabled devices for shaping electromagnetic wave radiation and guidance, at both radio frequencies and optical wavelengths. Different from conventional coordinate transformations, more advanced and versatile coordinate transformations are exploited here to benefit diverse applications, thereby providing expanded design flexibility, enhanced device performance, as well as reduced implementation complexity. These design examples demonstrate the comprehensive capability of transformation optics in controlling electromagnetic waves, while the associated novel devices will open up new paths towards future integrated electromagnetic component synthesis and design, from microwave to optical spectral regimes.

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Krishnamurthi, Vijay, Brent Bailey, and Frederick Lanni. "3-D optical transfer in excitation field synthesis microscopes." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 64–65. http://dx.doi.org/10.1017/s0424820100136696.

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Excitation field synthesis (EFS) refers to the use of an interference optical system in a direct-imaging microscope to improve 3D resolution by axially-selective excitation of fluorescence within a specimen. The excitation field can be thought of as a weighting factor for the point-spread function (PSF) of the microscope, so that the optical transfer function (OTF) gets expanded by convolution with the Fourier transform of the field intensity. The simplest EFS system is the standing-wave fluorescence microscope, in which an axially-periodic excitation field is set up through the specimen by interference of a pair of collimated, coherent, s-polarized beams that enter the specimen from opposite sides at matching angles. In this case, spatial information about the object is recovered in the central OTF passband, plus two symmetric, axially-shifted sidebands. Gaps between these bands represent "lost" information about the 3D structure of the object. Because the sideband shift is equal to the spatial frequency of the standing-wave (SW) field, more complete recovery of information is possible by superposition of fields having different periods. When all of the fields have an antinode at a common plane (set to be coincident with the in-focus plane), the "synthesized" field is peaked in a narrow infocus zone.

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Shaker, Reyhane, Alireza Mallahzadeh, and Mohammad Hossein Amini. "Low side-lobe level pattern synthesis of optical leaky-wave antennas." Optik 242 (September 2021): 167192. http://dx.doi.org/10.1016/j.ijleo.2021.167192.

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SENTHILKUMARAN, PARAMASIVAM, and FRANK WYROWSKI. "Phase synthesis in wave-optical engineering: mapping- and diffuser-type approaches." Journal of Modern Optics 49, no. 11 (September 2002): 1831–50. http://dx.doi.org/10.1080/09500340210140533.

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Foord, A. P., P. A. Davies, and P. A. Greenhalgh. "Synthesis of microwave and millimetre-wave filters using optical spectrum-slicing." Electronics Letters 32, no. 4 (1996): 390. http://dx.doi.org/10.1049/el:19960243.

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Inaba, H., T. Ikegami, Feng-Lei Hong, A. Onae, Y. Koga, T. R. Schibli, K. Minoshima, et al. "Phase locking of a continuous-wave optical parametric oscillator to an optical frequency comb for optical frequency synthesis." IEEE Journal of Quantum Electronics 40, no. 7 (July 2004): 929–36. http://dx.doi.org/10.1109/jqe.2004.830211.

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Wang, Jing-Sheng. "Newly Installed Radio and Optical Telescopes in China." Publications of the Astronomical Society of Australia 9, no. 1 (1991): 60–61. http://dx.doi.org/10.1017/s1323358000024899.

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AbstractNew radio and optical telescopes installed in recent years in China are summarised. These include the 2.16-m optical telescope, the solar magnetic field telescope, the Miyun synthesis radio telescope, the 1.26-m infrared telescope (Beijing Astronomical Observatory), the 25-m radio telescope as the first station of China’s VLBI network, the 1.56-m astrometric telescope (Shanghai Observatory), and the 13.7-m millimetre wave radio telescope.

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Більше джерел

Дисертації з теми "Optical wave synthesis"

Taylor, Christopher Trevor. "Enhancement of imagery from passive millimetre-wave systems for security scanning." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/enhancement-of-imagery-from-passive-millimetrewave-systems-for-security-scanning(7011ec7c-86ee-4770-b637-7ffe4909b241).html.

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This thesis concerns methods to enhance current and explore future radiometric imaging systems for security screening. Its main focus is on the test and calibration procedures for the BorderWatch system – an established 33 GHz passive millimetre-wave imager developed by QinetiQ PLC as an outdoor security scanning portal for soft-sided heavy goods vehicles at ports of entry. The effects of the limited size of the sky background reflector of the operational system are addressed and modifications to mitigate these effects are proposed. Systematic diurnal and seasonal variations in the receiver output powers are characterised and strongly linked with variations in the physical temperature of the RF components. The proposed BorderWatch temperature calibration subsystem requires a reliable cold sky temperature reference point; the aim being to reduce the level of fixed pattern noise in present-day imagery and allow for post-processing methods requiring absolute temperature values. Cost considerations rule out independent millimetre-wave radiometers at each site so a proposed alternative is to use infra-red measurements as a proxy. A literature investigation is made into the millimetre-wave and infrared atmospheric opacities for a variety of meteorological conditions. The design, calibration and operation of a 35 GHz switching radiometer is described together with a comparison of the millimetre-wave radiometric brightness temperature measurements against the data from a low cost commercial infra-red sensor and from a nearby meteorological station. The results show an excellent correlation between the zenith sky temperatures in the infrared and millimetre-wave bands but only in clear sky conditions – as anticipated the presence of clouds affects the infra-red brightness distribution much more strongly than that of the millimetre-wave. Future security imagers may well incorporate interferometric arrays. An extensive simulation programme has been carried out to explore appropriate numbers of antennas and whether radio astronomy configurations and post-processing techniques can offer cost-effective routes to high image fidelity. The results of a quantitative analysis are promising and array configurations and techniques appropriate for potential future security imagers are suggested.

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Nova, Lavado Enrique. "Millimeter-wave and terahertz imaging techniques." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/129466.

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This thesis presents the development and assessment of imaging techniques in the millimeterwave (mmW) and terahertz frequency bands. In the first part of the thesis, the development of a 94 GHz passive screener based on a total-power radiometer (TPR) with mechanical beamscanning is presented. Several images have been acquired with the TPR screener demonstrator, either in indoor and outdoor environments, serving as a testbed to acquire the know-how required to perform the research presented in the following parts of the thesis. In the second part of the thesis, a theoretical research on the performance of near-field passive screeners is described. This part stands out the tradeoff between spatial and radiometric resolutions taking into account the image distortion produced by placing the scenario in the near-field range of the radiometer array. In addition, the impact of the decorrelation effect in the image has been also studied simulating the reconstruction technique of a synthetic aperture radiometer. Guidelines to choose the proper radiometer depending on the application, the scenario, the acquisition speed and the tolerated image distortion are given in this part. In the third part of the thesis, the development of a correlation technique with optical processing applicable to millimeter-wave interferometric radiometers is described. The technique is capable of correlating wide-bandwidth signals in the optical domain with no loss of radiometric sensitivity. The theoretical development of the method as well as measurements validating the suitability to correlate radiometric signals are presented in this part. In the final part of the thesis, the frequency band of the imaging problem is increased to frequencies beyond 100 GHz, covering the THz band. In this case the research is centered in tomographic techniques that include spectral information of the samples in the reconstructed images. The tomographic algorithm can provide detection and identification of chemical compounds that present a certain spectral footprint in the THz frequency band.

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Nebel, Paul. "Synthesis of optimal control of a wave energy converter." Thesis, University of Edinburgh, 1994. http://hdl.handle.net/1842/12708.

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The thesis begins by describing the experimental determination of the hydrodynamic coefficients of two test models; an Edinburgh duck and a semi-submerged, horizontal right circular cylinder. The impedance and wave force coefficient matrices are measured for these two models, and in the case of the cylinder are checked against exact analytical results. The radiation and scattering pattern matrices are also measured. Synthesis of optimal (complex-conjugate) control is achieved for the cylinder in one and two degrees-of-freedom, and for the duck in one, two and three degrees-of-freedom. Synthesis is defined as the pre-computation of drive signals to simulate control using prior knowledge of the incident wave and the device hydrodynamics. The concept of complex-conjugate control with amplitude constraint is introduced, and synthesised for the cylinder. This is compared with the results for control without constraint. A discrepancy is found between efficiency calculated at the duck axis and efficiency calculated from the wave amplitudes. This is traced to physical losses in the system. These losses are due to the scale of the test models, and may not be present at full-scale. Having accounted for these losses, the results for the synthesis runs agree well with predictions based on the model coefficients and hydrodynamics. This suggests that the linear model can be used to predict the effect of changes in shape on the forces, displacements and velocities of an optimally controlled device. Full-scale performance is predicted for a 10m diameter duck in unidirectional mixed seas. Two pseudo-optimal control strategies are defined which are based on the impedance measurements. Four different physical configurations are considered. It is found that changing the configuration will roughly determine the effectiveness of the device, and choosing the correct control strategy for that configuration fine tunes performance. The two pseudo-optimal strategies are simple to implement, but are nearly as effective as complex-conjugate control.

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Ignacchiti, Jim. "Contrôle et caractérisation de la cohérence Raman induite par bruit quantique dans des ﬁbres creuses remplies de gaz". Electronic Thesis or Diss., Limoges, 2024. http://www.theses.fr/2024LIMO0056.

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Ces travaux de thèse portent sur la conception, la mise en œuvre et l’utilisation d’une plateforme expérimentale et de simulations numériques visant à exciter et ampliﬁer la cohérence Raman de façon contrôlée à partir du bruit quantique. L’objectif est d’explorer la diﬀusion Raman stimulée dans des ﬁbres creuses comme un moyen de générer des peignes de fréquences optiques cohérents, avec une largeur spectrale multiple-octaves, et ainsi créer un outil pour produire des fonctions d’ondes optiques arbitraires, telles que des impulsions attosecondes ou des lasers à modes verrouillés. Le principe repose sur l’excitation d’un gaz contenu dans une ﬁbre à cristal photonique à cœur creux (HCPCF) par des impulsions laser ultrabrèves de telle sorte qu’un seul des modes spatio-temporels cohérents et indépendants de l’émission spontanée de la radiation Stokes soit excité et ampliﬁé. Cette approche novatrice assure une modulation de phase du champ du laser d’excitation à des fréquences très élevées et sans bruit de phase. Elle se distingue des techniques existantes, telles que la modulation moléculaire, par l’absence de besoin d’un deuxième laser. Cependant, cette méthode nécessite un guide optique unimodal et un gain Raman exceptionnellement élevé. Dans ce contexte, ces travaux se sont ainsi focalisés sur la génération et la mesure de la cohérence intra et inter-impulsionnelle du peigne Raman aﬁn d’évaluer son potentiel pour les applications mentionnées précédemment. Pour ce faire, un modèle théorique de la diﬀusion Raman stimulée en régime impulsionnel a été développé, soulignant l’intérêt du régime transitoire, qui ampliﬁe le champ Stokes en un seul mode temporel. Des simulations numériques ont ensuite détaillé la dynamique du champ Stokes à travers le milieu Raman, en prenant en compte des facteurs tels que la déplétion du laser. Par ailleurs, une ﬁbre optique à cœur creux hybride a été spéciﬁquement développée, oﬀrant de faibles pertes linéiques (quelques dB/km à 1030 nm) et un guidage unimodal exceptionnel (MPI jusqu’à −47 dB), assurant ainsi la cohérence spatiale du peigne Raman. Deux bancs expérimentaux ont ensuite été réalisés pour examiner la cohérence du peigne, en commençant par l’aspect intra-impulsionnel. Un laser infrarouge réglable en durée d’impulsion, en énergie et en taux de répétition a été couplé dans la ﬁbre remplie de dihydrogène pour générer le peigne, puis analysé à la sortie avec un interféromètre Mach-Zehnder à haute résolution temporelle (∼ fs) et large plage dynamique (environ 50 ps). Les résultats ont montré qu’en travaillant dans la gamme 3 − 10 ps et 1 − 10 µJ, les eﬀets parasites, comme l’eﬀet Kerr, sont minimisés, et la cohérence mutuelle est proche de l’unité pour toutes les raies de Stokes et anti-Stokes du 1er ordre, comme conﬁrmé par les calculs numériques. L’étude de la cohérence inter-impulsionnelle a révélé un comportement complexe pour des impulsions espacées de moins de 1 ns et une diminution de la cohérence suivant la valeur du temps de relaxation de la cohérence (∼ 2 ns) pour des délais plus longs entre les impulsions. Ces résultats soulignent l’importance de contrôler l’énergie et le délai des impulsions pour maintenir une haute cohérence, et suggèrent que des lasers d’excitation à des cadences de l’ordre de 400 MHz ou plus peuvent générer des lasers à modes verrouillés basés sur notre approche. En conclusion, les avancées réalisées durant cette thèse sur les propriétés de cohérence des peignes de fréquence montrent le potentiel de la diﬀusion Raman stimulée dans les HCPCFs pour la synthèse d’ondes optiques, et ouvrent la voie à d’autres applications comme la conversion de fréquence pour l’optique quantique, le piégeage optique et le refroidissement moléculaire
This thesis addresses the design, implementation, and use of an experimental and numerical simulation platform aimed at exciting and amplifying Raman coherence in a controlled manner from quantum noise. The long term objective is to explore stimulated Raman scattering in hollow-core ﬁber as a means to generate coherent optical frequency combs with a multi-octave spectral width, thus creating a tool for generating arbitrary optical wave functions, such as attosecond pulses, or mode-locked lasers. The principle is based on the excitation of a gas contained in a hollow-core photonic crystal ﬁber (HCPCF) by ultrashort laser pulses, in such a way that only one of the coherent and independent spatiotemporal modes of the spontaneous Stokes radiation is excited and ampliﬁed. This innovative approach ensures phase modulation of the excitation laser ﬁeld at very high frequencies without phase noise. It diﬀers from existing techniques, such as molecular modulation, by eliminating the need for a second laser. However, this method requires a single-mode optical guide and exceptionally high Raman gain. In this context, this work focuses then on the generation and measurement of the intra and inter-pulse coherence of the Raman comb to evaluate its potential for the aforementioned applications. To this end, a theoretical model of stimulated Raman scattering in the impulsive regime was developed, highlighting the interest of the transient regime, which ampliﬁes the Stokes ﬁeld in a single temporal mode. Numerical simulations then detailed the dynamics of the Stokes ﬁeld through the Raman medium, taking into account factors such as laser depletion. Furthermore, a speciﬁc hybrid hollow-core optical ﬁber was developed, oﬀering low linear losses (a few dB/km at 1030 nm) and exceptional single-mode guidance (MPI up to −47 dB), thus ensuring the spatial coherence of the Raman comb. Two experimental setups were then realized to examine the comb’s coherence, starting with the intra-pulse aspect. An infrared laser adjustable in pulse duration, energy, and repetition rate was coupled into the hydrogen-ﬁlled ﬁber to generate the comb, then analyzed at the output with a Mach-Zehnder interferometer with high temporal resolution (∼ fs) and wide dynamic range (approximately 50 ps). The results showed that working in the range of 3 − 10 ps and 1 − 10 µJ minimizes parasitic eﬀects such as the Kerr eﬀect, and the mutual coherence is close to unity for all ﬁrst-order Stokes and anti-Stokes lines, as conﬁrmed by numerical calculations. The study of inter-pulse coherence revealed a complex behavior for pulses spaced less than 1 ns apart and a decrease in coherence corresponding to the coherence relaxation time (∼ 2 ns) for longer delays between pulses. These results highlight the importance of controlling the energy and delay of pulses to maintain high coherence and suggest that excitation lasers with repetition rates around 400 MHz or more can generate mode-locked lasers based on our approach. In conclusion, the advances made during this thesis on the coherence properties of frequency combs demonstrate the potential of stimulated Raman scattering in HCPCFs for optical wave synthesis and pave the way for other applications such as frequency conversion for quantum optics, optical trapping, and molecular cooling

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Caba, Wilson Ariel. "Application of antenna synthesis and digital signal processing techniques for active millimeter-wave imaging systems." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4532.

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Millimeter-wave imaging has gathered attention in recent years for its ability to penetrate clothing, thin layers of soils, and certain construction materials. However, image quality remains a challenge that needs to be addressed. One way of improving image quality is by increasing the dimensions of the collecting aperture. A sparse array can be used to synthesize a larger aperture with a limited set of relatively small detectors. In this research we design, build, and test a test-bed having an active source at 94 GHz and an array of coherent detectors, mounted on arms that extend radially on a rotary table. Using this test bed a circular area with a maximum diameter of 900 mm can be scanned. The signal is down-converted using heterodyne receivers with digital in-phase and quadrature detection. Signal correlation is performed using the digitized data, which is stored for post-processing, electronic focusing, and image reconstruction. Near-field imaging using interferometric reconstructions is achieved using electronic focusing. Imaging tests show the ability of the system to generate imagery of concealed and unconcealed objects at distances between 400 and 700 mm. A study of the effects of redundant and non-redundant configurations on image quality for 4 common detector configurations is presented. In this document we show that an active sparse-aperture imaging system using digital correlators is a viable way to generate millimeter-wave images.
ID: 029050356; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (Ph.D.)--University of Central Florida, 2010.; Includes bibliographical references (p. 125-129).
Ph.D.
Doctorate
Optics and Photonics

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North, Jan Arthur. "Fourier image synthesis and slope spectrum analysis of deepwater, wind-wave scenes viewed at Brewster's angle /." Online version of thesis, 1989. http://hdl.handle.net/1850/11520.

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Bhatambrekar, Nishant. "Realizing a fractional volt half-wave voltage in Mach-Zehnder modulators using a DC biased push-pull method and synthesis and characterization of indole based NLO chromophores for improving electro-optic activity /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/11606.

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Phruksahiran, Narathep. "Polarimetrische Streuungseigenschaften und Fokussierungsmethoden zur quantitativen Auswertung der polarimetrischen SAR-Daten." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-107764.

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Das Radar mit synthetischer Apertur (Synthetic Aperture Radar - SAR) liefert eine quasi-fotographische Abbildung der beleuchteten Bodenoberfläche mit zusätzlichen Informationen, die von der gesendeten und empfangenen Polarisation der Wellen abhängig sind. Eine nützliche Anwendung der polarimetrischen SAR-Daten liegt bei der Klassifizierung der Bodenstruktur anhand der polarimetrischen Streuungseigenschaften. In diesem Zusammenhang beschäftigt sich die vorliegende Arbeit mit der Entwicklung und Untersuchung neuer polarimetrischen Fokussierungsfunktion für die SAR-Datenverarbeitung mit Hilfe der polarimetrischen Rückstreuungseigenschaft, die zu einer alternativen quantitativen Auswertung der polarimerischen SAR-Daten führen kann. Die physikalische Optik Approximation wird für die numerische Berechnung der rückgestreuten elektrischen Felder der kanonischen Ziele unter SAR-Geometrie unter Berücksichtigung der Polarisationslage verwendet. Aus den rückgestreuten elektrischen Felder werden die polarimetrischen Radarrückstreuquerschnitte berechnet. Ein SAR-Simulator wird zur Datenverarbeitung der E-SAR des DLR entwickelt. Der Ansatz des polarimetrischen Radarrückstreuquerschnittes ermöglicht die approximierte numerische Berechnung der Rückstreuungseigenschaften der kanonischen Ziele sowohl im kopolaren als auch im kreuzpolaren Polarisationsbetrieb. Bei der SAR-Datenverarbeitung werden die Rohdatensätze durch die Referenzfunktion eines Punktzieles in der Entfernungsrichtung verarbeitet. Bei der Azimutkompression werden die vier Referenzfunktionen, das heißt die Referenzfunktion eines Punktzieles, die polarimetrische Fokussierungsfunktion einer flachen Platte, die polarimetrische Fokussierungsfunktion eines Zweifach-Reflektors und die polarimetrische Fokussierungsfunktion eines Dreifach-Reflektors, eingesetzt. Die qunatitativen Auswertung der SAR-Daten werden anhand des Pauli-Zerlegungstheorems, der differentiellen Reflektivität und des linearen Depolarisationsverhältnises durchgeführt.

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Kilicaslan, Amaury. "Etude spectroscopique d’un plasma micro-onde à la pression atmosphérique et son application à la synthèse de nanostructures." Thèse, 2014. http://hdl.handle.net/1866/10600.

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L’objectif de ce mémoire de maîtrise est de caractériser la distribution axiale des plasmas tubulaires à la pression atmosphérique créés et entretenus par une onde électromagnétique de surface ainsi que d’explorer le potentiel de ces sources pour la synthèse de matériaux et de nanomatériaux. Un précédent travail de thèse, qui avait pour objectif de déterminer les mécanismes à l’origine de la contraction radiale du plasma créé dans des gaz rares, a mis en lumière un phénomène jusque-là inconnu dans les plasmas d’onde de surface (POS). En effet, la distribution axiale varie différemment selon la puissance incidente ce qui constitue une différence majeure par rapport aux plasmas à pression réduite. Dans ce contexte, nous avons réalisé une étude paramétrique des POS à la pression atmosphérique dans l’Ar. À partir de nos mesures de densité électronique, de température d’excitation et de densité d’atomes d’Ar dans un niveau métastable (Ar 3P2), résolues axialement, nous avons conclu que le comportement axial de l’intensité lumineuse avec la puissance n’est pas lié à un changement de la cinétique de la décharge (qui est dépendante de la température des électrons et de la densité d’atomes d’Ar métastables), mais plutôt à une distribution anormale de dissipation de puissance dans le plasma (reliée à la densité d’électrons). Plus précisément, nos résultats suggèrent que ce dépôt anormal de puissance provient d’une réflexion de l’onde dans le fort gradient de densité de charges en fin de colonne, un effet plus marqué pour de faibles longueurs de colonnes à plasma. Ensuite, nous avons effectué une étude spectroscopique du plasma en présence de précurseurs organiques, en particulier le HMDSO pour la synthèse de matériaux organosiliciés et l’IPT pour la synthèse de matériaux organotitaniques. Les POS à la PA sont caractérisés par des densités de charges très élevées (>10^13 cm^-3), permettant ainsi d’atteindre des degrés de dissociation des précurseurs nettement plus élevés que ceux d'autres plasmas froids à la pression atmosphérique comme les décharges à barrière diélectrique. Dans de tels cas, les matériaux synthétisés prennent la forme de nanopoudres organiques de taille inférieure à 100 nm. En présence de faibles quantités d’oxygène dans le plasma, nous obtenons plutôt des nanopoudres à base d’oxyde de silicium (HMDSO) ou à base de titanate de silicium (IPT), avec très peu de carbone.
The purpose of this master thesis is to characterize the axial distribution of tubular discharges at atmospheric pressure sustained by electromagnetic surface wave and to explore their potential for materials and nanomaterials synthesis. A previous doctoral thesis, aimed at determining the mechanisms driving radial plasma contraction in rare gas discharges shed light on a yet unknown phenomenon occurring in surface wave discharges (SWD). As a matter of fact, increasing the power injected into the system leads to a change of the axial distribution of the discharge, in sharp contrast with the behavior commonly observed in reduced-pressure plasmas. In this context, we have performed a parametric investigation of atmospheric pressure SWD sustained in Ar gas. Based on our axially-resolved measurements of the electron density, excitation temperature, and number density of Ar atoms in metastable state (Ar 3P2), we found that the peculiar change of the axial distribution of the light intensity with power is not linked to a modification in the discharge kinetics (linked to the electron temperature and metastable number density) but rather to an anomalous power deposition (linked to the electron density). More specifically, such anomalous power deposition can be attributed to a wave reflection in the high gradient of charged particle densities near the end of the plasma column; a behavior that is more apparent in short plasma columns. Then, we have realized a parametric investigation of the discharge with the addition of organic precursors. Particularly, we used HMDSO for organo-silicon material synthesis and TTIP for organo-titanium material synthesis. It is found that because SWD are characterized by high charged particle densities (>10^13 cm^-3), higher precursor dissociation rates can be achieved with respect to other cold, atmospheric-pressure plasmas such as low-density dielectric barrier discharges. In this case, powder-like nanomaterials with sizes below 100 nm are obtained. Moreover, the addition of small amounts of oxygen into the discharge leads to the formation of round-like silicon oxide or titanium oxide nanoparticles.

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Jarvis, Thomas William. "Novel tools for ultrafast spectroscopy." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4456.

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Exciton dynamics in semiconductor nanostructures are dominated by the effects of many-body physics. The application of coherent spectroscopic tools, such as two-dimensional Fourier transform spectroscopy (2dFTS), to the study of these systems can reveal signatures of these effects, and in combination with sophisticated theoretical modeling, can lead to more complete understanding of the behaviour of these systems. 2dFTS has previously been applied to the study of GaAs quantum well samples. In this thesis, we outline a precis of the technique before describing our own experiments using 2dFTS in a partially collinear geometry. This geometry has previously been used to study chemical systems, but we believe these experiments to be the first such performed on semiconductor samples. We extend this technique to a reflection mode 2dFTS experiment, which we believe to be the first such measurement. In order to extend the techniques of coherent spectroscopy to structured systems, we construct an experimental apparatus that permits us to control the beam geometry used to perform four-wave mixing reflection measurements. To isolate extremely weak signals from intense background fields, we extend a conventional lock-in detection scheme to one that treats the optical fields exciting the sample on an unequal footing. To the best of our knowledge, these measurements represent a novel spectroscopic tool that has not previously been described.
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Книги з теми "Optical wave synthesis"

Biagini, Carlo, ed. L'Ospedale degli Infermi di Faenza. Florence: Firenze University Press, 2007. http://dx.doi.org/10.36253/978-88-8453-591-7.

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In view of its inevitable implications at an individual and collective level, in all historic periods hospital building has represented the most advanced level of elaboration of architectural models aimed at the optimal synthesis of form, function and technique. Consequently, the typological and morphological reading of the Ospedale degli Infermi of Faenza, in the wake of a campaign of architectural surveys and archive research, represents an opportunity for verifying the relationship between technical culture and design and building practice through which it is possible to identify the typological and semantic values of the architecture. Designed and constructed by the master builders Raffaele and Giovanbattista Campidori in the middle of the eighteenth century, the various phases in the transformation of the Hospital are analysed down to our own times, positing tools and methods of investigation designed to optimise operations for the rehabilitation and conservation of the most ancient part of the building.

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Center, Langley Research, ed. A conceptual thermal design study of an electronically scanned thinned array radiometer. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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Towe, E., and D. Pal. Intersublevel quantum-dot infrared photodetectors. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533060.013.7.

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This article describes the basic principles of semiconductor quantum-dot infrared photodetectors based on conduction-band intersublevel transitions. Sufficient background material is discussed to enable an appreciation of the subtle differences between quantum-well and quantum-dot devices. The article first considers infrared photon absorption and photon detection, along with some metrics for photon detectors and the detection of infrared radiation by semiconductors. It then examines the optical matrix element for interband, intersubband and intersublevel transitions before turning to experimental single-pixel quantum-dot infrared photodetectors. In particular, it explains the epitaxial synthesis of quantum dots and looks at mid-wave and long-wave quantum-dot infrared photodetectors. It also evaluates the characteristics of quantum-dot detectors and possible development of quantum-dot focal plane array imagers. The article concludes with an assessment of the challenges and prospects for high-performance detectors and arrays.

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Phase-Locked Frequency Generation and Clocking: Architectures and Circuits for Modern Wireless and Wireline Systems. Institution of Engineering & Technology, 2020.

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Частини книг з теми "Optical wave synthesis"

Tamil, Lakshman S., and Arthur K. Jordan. "Synthesis of Optical Interconnects and Logic Gates." In Guided-Wave Optoelectronics, 177–86. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1039-4_23.

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Shekhtman, V. N. "Synthesis of Interferograms by Lateral Shear to Measure Wave Front of a Light Beam." In Optical Resonators — Science and Engineering, 301–7. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-2486-9_19.

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Saha, Swapan Kumar. "Introduction to Wave Optics." In Aperture Synthesis, 1–29. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-5710-8_1.

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Ohtsuki, Yukiyoshi, Yoshikazu Nishiyama, Tsuyoshi Kato, Hirohiko Kono, and Yuichi Fujimura. "Numerical Synthesis of Optimal Laser Pulses for Manipulating Dissociation Wave Packets of I2 − in Water." In Springer Series in Chemical Physics, 511–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27213-5_156.

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Gorbunov, M. E. "Wave Optics Algorithms for Processing Radio Occultation Data in the Lower Troposphere: A Review and Synthesis." In Occultations for Probing Atmosphere and Climate, 11–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-09041-1_2.

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Ramya, Emusani. "Green Synthesis of Metal Nanostructures and Its Nonlinear Optical Properties." In Nonlinear Optics [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99449.

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Simple green synthesis of metal nanoparticles (Ag NPs) was prepared by using Raphanussativus leaf extract. This extract acts as reduce and stabilizing agent. The formation of silver NPs was confirmed and characterized by XRD, UV–visible absorption spectrum, TEM, and FTIR. The luminescence enhancement and quenching of Eu3+and Sm3+ ions were observed in the presence of silver NPs. The luminescence enhancement is owing to arise in the electric-dipole transition with alteration of the field around Ln3+ ions. Nonlinear studies in femtosecond (fs) and picosecond (ps) time scales have been studied by using the Z-scan technique. Third-order nonlinear optical susceptibility of silver nanoparticles was obtained with Degenerate Four-Wave Mixing (DFWM) in the fs regime. The lifetimes of lanthanum complexes were increased by the concentration of silver NPs and decreased for further silver. The high enhanced luminescence and nonlinear studies of green synthesized silver nanoparticles can be used in optics and bio applications.

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Bairy, Raghavendra, Vijeth H., Rajesh K., and Rohan S. Deshmukh. "Synthesis and Characterization of CdS and ZnS Nanostructured Thin Films for Opto-electronic Energy Applications." In Thin Film Nanomaterials: Synthesis, Properties and Innovative Energy Applications, 1–35. BENTHAM SCIENCE PUBLISHERS, 2024. http://dx.doi.org/10.2174/9789815256086124010004.

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Since their early discovery, thin films have quickly found industrial uses, including decorative, optical, and energy storage applications. The range of applications for thin film technology has expanded to the point where nearly every industrial sector now uses it to impart specific physical and chemical properties to the surface of bulk materials. The ability to customize film properties by varying the microstructure through the deposition parameters used in a particular deposition technique has recently allowed them to advance from the most basic applications, like protective coatings against wear and corrosion, to the most technologically advanced ones, like microelectronics and biomedicine. Despite such remarkable advancements, the relationship between all phases of the fabrication of metal sulphide thin films such as CdS and ZnS specifically deposition parameters – morphology and characteristics, is not entirely precise. In summary, the characterization of thin films involved several techniques, including X-ray diffraction, UV-Vis spectrophotometry, scanning electron microscopy, energydispersive X-ray diffraction, and transmission electron microscopy. The investigation of nonlinear optical (NLO) parameters was carried out through open aperture (OA) and closed aperture (CA) Z-scan measurements, employing a diode-pumped solid-state continuous-wave laser at 532 nm excitation. The NLO parameters, namely the nonlinear absorption coefficient (β), nonlinear refractive index (n2), and third-order NLO susceptibility (χ(3)) exhibited an increasing trend with higher doping concentrations. These promising outcomes regarding the NLO parameters in nanostructured CdS and ZnS thin films with increasing doping concentrations suggest that these processed films hold significant potential for applications in opto-electronic energy-related technologies.

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Narasimman, Subramaniyam, Lakshmi Narayanan Balakrishnan, Arunkumar Chandrasekhar, and Zachariah C. Alex. "A Study on Fiber Optic Temperature Sensor Using Al₂O₃ as High Index Overlay for Solar Cell Applications." In Nanogenerators and Self-Powered Systems [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.110496.

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Recently, the performance of solar cell is impacted by rising panel temperatures. For solar cells to work at their best and have the longest possible useful life, the temperature of the panels must be kept at an ideal level. Current temperature sensors have a slow response time, poor accuracy, and low resolution. Meanwhile, Al2O3 and its derivatives have demonstrated a noteworthy role in temperature sensing applications due to its greater surface area, ease of synthesis, tailored optical characteristics, high melting point, and high thermal expansion coefficient. Al2O3-based nanoparticles have been employed in fiber optic-based temperature sensors as a sensing layer, a sensitivity improvement material, and a sensing matrix material. In this chapter, we discuss the function of Al2O3-based nanomaterials in evanescent wave-based temperature sensors, sensing characteristics such as sensitivity, linearity, and repeatability. The ZAZ-based sensor (Section 3.1) shows an operating temperature range between 100.9°C and 1111.0°C, the temperature sensitivity becomes 1.8 × 10−5/°C. The fabricated sensor had a linearity of 99.79%. The synthesized Al2O3 nanoparticles (Section 3.2) were given better linearity and high sensitivity (~27) at 697 nm compared with other sensing materials such as ZnO, SnO2, TiO2. The Al2O3-MgO (50–50%) (Section 3.3) demonstrated an ultrahigh sensitivity of 0.62%/°C with a better linear regression coefficient of 95%. The present advances and problems are also discussed in detail.

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Xi, Xian, and Jiangqing Huang. "Seismic Scattering Wave Field Imaging Method Based on Convolution Neural Network and Equivalent Training Model." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220031.

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The inversion of scattered waves in seismic exploration is a hot and difficult problem in related fields. We propose a hypothesis: the local wave field near each point on the wave field profile has a relationship with the minimum distance between that point and each scatterer, and this relationship can be recognized by a convolutional neural network (CNN). Based on this, the designed CNN can steadily classify and identify the scattered wavefield point by point, and realize the inversion imaging of the scatterer. We propose a new method of inversion imaging of scattered wavefield based on CNN and equivalent training model. The new method transforms the optimal inversion problem of the scatterer into the optimal design problem of the equivalent training model. Through the equivalent training model constructed by a parameterized method, the wavefield inversion and scatterer imaging of two different layered random cave media models are well realized, and the scattered wave imaging of the wavefield of the Marmousi2 model synthesis data is also realized robustly. The use of Bayesian discriminant imaging improves the resolution of the inversion results and helps interpreters quickly and accurately locate the scatterers.

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Butt, Muhammad A. "Photonic Crystal Instruments." In Photonic Materials: Recent Advances and Emerging Applications, 1–20. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815049756123010004.

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 Photonic crystals (hereafter represented as PCs), a synthetic dielectric formation that employs periodic and random changes in the refractive index to control the transmission of light, were presented by Yablonovitch and John in 1987. The capability to change the transmission of the electromagnetic wave in these formations on a miniature scale is used by photonic devices built on PCs. Electromagnetic waves scatter within the PC, and destructive intrusion happens at particular wavelengths, resulting in a photonic bandgap like the energy bandgap of electron waves in a semiconductor (hereafter denoted as SC). Because of the possibility of constructing a photonic bandgap, it may be feasible to influence light transmission. Instruments with tiny footprints are also feasible. In recent years, several fascinating PC-based devices, such as sharp bent waveguides (henceforth denoted as W/G), μ-resonator cavities, and Y-branches, have been demonstrated. These remarkable properties have the potential to result in the growth of a dense integrated circuit. Though PC technology is still in its infancy, and more study is needed in this field, this chapter summarizes recent developments in this sector by presenting the utmost frequent and necessary optical devices established on PCs such as optical logic gates, optical power splitters, polarization splitters, sensing devices, and lasers. In comparison to conventional photonic devices, these devices have greater efficiency and a small footprint. <br>

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Тези доповідей конференцій з теми "Optical wave synthesis"

Morozov, Oleg G., rustam misbakhov, vadim artemiev, and Gennady Morozov. "Synthesis of symmetrical wave and phase address fiber Bragg structures." In Optical Technologies for Telecommunications 2023, edited by Oleg G. Morozov, Albert C. Sultanov, and Anton V. Bourdine, 58. SPIE, 2024. http://dx.doi.org/10.1117/12.3026648.

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Cui, Shaozhe, Zhe Peng, Yuanrui Dong, Yingwei He, Guojin Feng, and Haiyong Gan. "Aircraft detection in high-resolution synthetic aperture radar images based on optical training dataset." In Infrared, Millimeter-Wave, and Terahertz Technologies XI, edited by Masahiko Tani and Cunlin Zhang, 27. SPIE, 2024. http://dx.doi.org/10.1117/12.3036454.

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Kuś, Arkadiusz. "Dual-wavelength, near-infrared holographic tomography." In Digital Holography and Three-Dimensional Imaging, W4A.33. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/dh.2024.w4a.33.

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Dual wavelength interferometry has a long history and broad range of applications in optical measurements of objects, which exhibit phase steps greater than the single measurement wavelength [1–3]. The use of two measurements at slightly different wavelengths allows to extend the measurement range. In case of holographic tomography, the standard measurement of large samples such as organoids fails due to large refractive index differences and phase unwrapping errors. The application of synthetic wavelength allows to decrease the values of phase of the scattered wave for the synthetic wavelength and thus apply Born approximation to objects that exceed the π/2 phase for each of the constituent measurements. In this work holographic tomography is performed with a swept laser source, which additionally allows to fine-tune the synthetic wavelength.

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Lohmann, Adolf W., David Mendlovic, and Gal Shabtay. "Coherence function as carrier of optical information." In Signal Recovery and Synthesis. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/srs.1998.swb.4.

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Haaland, Peter, and James Targove. "Flowing Afterglow Synthesis of Polythiophene Films." In Nonlinear Guided-Wave Phenomena. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/nlgwp.1991.tue4.

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Polymers of aromatic heterocycles such as thiophene and pyrrole have been actively investigated for their promising electrical and optical characteristics. However the use of these materials in waveguide structures has been constrained by morphological and synthetic barriers. Specifically, larger oligomers are less soluble causing multiphase chemical kinetics and irregular morphology in the metal-catalyzed coupling syntheses.fi] Electrochemical preparation methods also produce grainy or fibrillar material, most probably because the heterogeneous boundary conditions on film growth change as insulating or semi-conducting material is deposited on the electrodes. [2] We report here a synthetic approach to the polymeric heterocycle polythiophene using electronically excited argon metastables to activate organic precursors. This method is seen to produce dense, uniform films with desirable thiophene linkages and excellent optical properties.

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Weiner, A. M., and J. P. Heritage. "Spectral Shaping of Ultrashort Pulses and its Application to Pulse Compression and Dark Optical Solitons." In Nonlinear Guided-Wave Phenomena. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/nlgwp.1989.thd6.

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Linear filtering is a widely applicable technique for manipulating spectral and temporal profiles of signals in any linear system. Powerful techniques for linear filtering of picosecond and femtosecond optical pulses have recently been developed; and as a result, synthesis of arbitrarily shaped ultrashort pulses has been achieved [1-5]. In this paper we describe two applications of ultrafast pulse shaping to nonlinear guided wave optics: (a) experimental demonstration of fundamental dark soliton propagation in optical fibers [6], and (b) extreme stabilization of optical pulse compression by stimulated Raman scattering [7, 8].

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Ikeda, Osamu. "Proposal And Analysis Of Aberration-Free Array Imaging Using Phase Conjugation." In Signal Recovery and Synthesis. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/srs.1989.wb3.

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In this article, a signal-processing method is proposed to achieve diffraction-limited imaging of objects present in an aberrating medium. An array optical system is needed to acquire the data; some adaptive optics systems or optical fiber systems may be applicable for this purpose. The data are then processed in a computer, following the physical concept of repeated transmission of phase-conjugated wave, to find out the wave sharply focusing at a single point on the object. A mathematical analysis of the method does not guarantee the generation of such a sharp focal beam. Studies by computer simulation, however, show that this method works fairly well except for a few exceptional cases of object.

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Chen, L., W. Zhu, P. Huo, J. Song, H. J. Lezec, T. Xu, and A. Agrawal. "Arbitrary Space-time Wave Packet Synthesis." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.jth6c.9.

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We demonstrate arbitrary spatiotemporal synthesis of ultrafast optical transients by leveraging the multifunctional control of light at the nanoscale offered by metasurfaces, enabling ready-synthesis of complex space-time wave packets over an ultrawide bandwidth.

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Chen, Lu, Wenqi Zhu, Pengcheng Huo, Junyeob Song, Ting Xu, and Amit Agrawal. "Synthesis of Arbitrary Spatiotemporal Wave Packets." In Flat Optics: Components to Systems. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/flatoptics.2023.ftu2g.4.

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Haner, M., and W. S. Warren. "Generation of Crafted Optical Pulses for Nonlinear Laser Spectroscopy and Propagation Experiments using Electrooptic Time Domain Filtering." In Integrated and Guided Wave Optics. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/igwo.1989.mbb2.

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In coherent atomic and molecular laser spectroscopy, the capability to synthesize a temporally shaped laser pulse is a valuable asset. Experimental and theoretical work on pulse shaping in coherent spectroscopy has shown that precise control over the radiation field can enhance direct and multiphoton excitation or selectively excite an electronic or high vibrational state in a molecular system[1]. Complicated phase and amplitude modulated pulse shapes, such as [sech(at) ](1+3i), have been shown to be insensitive to inhomogeneous broadening, and do not undergo severe distortion due to optical density[2]. In addition to nonlinear laser spectroscopy, pulse shaping technology has been applied to several problems in nonlinear optics. In particular, it has been applied to soliton propagation in fibers where pulse shaping techniques have been used to observe new aspects of optical soliton propagation. Synthesis of tailored pulses with complicated amplitude and phase envelopes has enabled direct observations of complex solitons[3], and of "dark solitons"[4]. Both soliton families have detailed temporal and phase envelopes which can only be generated using pulse shaping techniques. Application of pulse shaping in other nonlinear propagation studies allow one to measure the sensitivity of the nonlinear interaction to phase and amplitude characteristics of the pulse.

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Звіти організацій з теми "Optical wave synthesis"

Hart, Carl, Gregory Lyons, and Michael White. Spherical shock waveform reconstruction by heterodyne interferometry. Engineer Research and Development Center (U.S.), May 2024. http://dx.doi.org/10.21079/11681/48471.

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The indirect measurement of shock waveforms by acousto-optic sensing requires a method to reconstruct the field from the projected data. Under the assumption of spherical symmetry, one approach is to reconstruct the field by the Abel inversion integral transform. When the acousto-optic sensing modality measures the change in optical phase difference time derivative, as for a heterodyne Mach–Zehnder interferometer, e.g., a laser Doppler vibrometer, the reconstructed field is the fluctuating refractive index time derivative. A technique is derived that reconstructs the fluctuating index directly by assuming plane wave propagation local to a probe beam. With synthetic data, this approach is compared to the Abel inversion integral transform and then applied to experimental data of laser-induced shockwaves. Time waveforms are reconstructed with greater accuracy except for the tail of the waveform that maps spatially to positions near a virtual origin. Furthermore, direct reconstruction of the fluctuating index field eliminates the required time integration and results in more accurate shock waveform peak values, rise times, and positive phase duration.

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