Добірка наукової літератури з теми "Nonlinear hologram"

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Статті в журналах з теми "Nonlinear hologram"

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Demoli, Nazif, Denis Abramović, Ognjen Milat, Mario Stipčević, and Hrvoje Skenderović. "Linearity and Optimum-Sampling in Photon-Counting Digital Holographic Microscopy." Photonics 9, no. 2 (January 27, 2022): 68. http://dx.doi.org/10.3390/photonics9020068.

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In the image plane configurations frequently used in digital holographic microscopy (DHM) systems, interference patterns are captured by a photo-sensitive array detector located at the image plane of an input object. The object information in these patterns is localized and thus extremely sensitive to phase errors caused by nonlinear hologram recordings (grating profiles are either square or saturated sinusoidal) or inadequate sampling regarding the information coverage (undersampled around the Nyquist frequency or arbitrarily oversampled). Here, we propose a solution for both hologram recording problems through implementing a photon-counting detector (PCD) mounted on a motorized XY translation stage. In such a way, inherently linear (because of a wide dynamic range of PCD) and optimum sampled (due to adjustable steps) digital holograms in the image plane configuration are recorded. Optimum sampling is estimated based on numerical analysis. The validity of the proposed approach is confirmed experimentally.
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Liu, Dahe, and Jing Zhou. "Nonlinear analysis for a reflection hologram." Optics Communications 107, no. 5-6 (May 1994): 471–79. http://dx.doi.org/10.1016/0030-4018(94)90365-4.

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Yang, Kun, Peng Li, Yan Kun Tang, Yan Nan Zhai, and Hui Zhang. "Study on Object Slight Displacement Measure Using Digital Image Hologram Method." Applied Mechanics and Materials 347-350 (August 2013): 278–81. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.278.

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Digital image hologram and double exposure method is used to measure displacement of an object in this paper, the intensity of object light has been increased effectively, the contrast of interference fringes has been improved, clear interference fringes has been gotten. A new method has been proposed that CCD and EALCD are applied in order to record the digital hologram and interference fringes, the drawback is avoided successfully that fixing, relocation and nonlinear recording of traditional hologram recording material are. Better experimental effect is achieved.
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Шойдин, С. А., та М. С. Ковалев. "Пространственный фотоотклик, формфактор и требования к голографическим материалам". Журнал технической физики 129, № 7 (2020): 885. http://dx.doi.org/10.21883/os.2020.07.49557.108-20.

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Reviewed the problems arising during the recording of holograms in bulk media, which manifest themselves in the first queue as the spatial resonance of the hologram recording field with refractive index inhomogeneities due to the already recorded part of the holographic lattice. And secondly, as a cross-interaction of two nonlinearities at recording holograms - nonlinearity of diffraction efficiency and nonlinearity of field distribution holograms of exposure and visibility of a registered holographic lattice. It is noted that the appearance one more nonlinearity - the nonlinear photoresponse of the holographic material - for certain conditions leads not to a decrease in diffraction efficiency, but to its increase. The main classes of volume holographic media — dynamic media that form a photoresponse during the exposure without chemical treatment and with chemical treatment — are determined. The maximum achievable diffraction efficiencies for both types materials are shown. Recommendations are made to eliminate the undesirable consequences of the detected effects, based on the analysis of the basic laws of photoresponse formation taking into account spatial resonance and the presence of a formfactor.
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Rau, W. D., H. Lichte, E. Voelkl, and U. Weierstall. "Real-time reconstruction of electron-off-axis holograms recorded by means of a high-pixel CCD camera." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 680–81. http://dx.doi.org/10.1017/s0424820100087719.

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Electron holography using the electron biprism is about to become a powerful tool to overcome the restrictions of the electron microscope, i.e. the lack of large area phase contrast and the limitation of resolution due to the oscillations of the transfer functions for high spatial frequencies. Up to now, the whole process of hologram detection and reconstruction takes a few hours: After a hologram is recorded on photographic plates, it needs development and digitizing. Then a correction of the nonlinear response of the photographic emulsion to electron exposure is indispensable, before the numerical reconstruction procedure can be started.
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Chen Daqing, 陈大庆, 周皓 Zhou Hao, 陶智 Tao Zhi, and 顾济华 Gu Jihua. "Fourier Computer-Generated Hologram Digital Watermarking with Nonlinear Amplitude Limiting." Acta Optica Sinica 31, no. 2 (2011): 0207002. http://dx.doi.org/10.3788/aos201131.0207002.

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Ormachea, O., and A. L. Tolstik. "Formation of the nonlinear dynamic hologram in clear organic fluids." Bulletin of the Russian Academy of Sciences: Physics 71, no. 1 (January 2007): 126–29. http://dx.doi.org/10.3103/s1062873807010327.

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Tsutsumi, Naoto, Kenji Kinashi, Asato Nonomura, and Wataru Sakai. "Quickly Updatable Hologram Images Using Poly(N-vinyl Carbazole) (PVCz) Photorefractive Polymer Composite." Materials 5, no. 8 (August 22, 2012): 1477–86. http://dx.doi.org/10.3390/ma5081477.

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Quickly updatable hologram images using photorefractive (PR) polymer composite based on poly(N-vinyl carbazole) (PVCz) is presented. PVCz is one of the pioneer materials of photoconductive polymers. PR polymer composite consists of 44 wt % of PVCz, 35 wt % of 4-azacycloheptylbenzylidene-malonitrile (7-DCST) as a nonlinear optical dye, 20 wt % of carbazolylethylpropionate (CzEPA) as a photoconductive plasticizer and 1 wt % of 2,4,7-trinitro-9-fluorenone (TNF) as a sensitizer. PR composite gives high diffraction efficiency of 68% at E = 45 V μm−1. Response speed of optical diffraction is the key parameter for real-time 3D holographic display. The key parameter for obtaining quickly updatable holographic images is to control the glass transition temperature lower enough to enhance chromophore orientation. Object image of the reflected coin surface recorded with reference beam at 532 nm (green beam) in the PR polymer composite is simultaneously reconstructed using a red probe beam at 642 nm. Instead of using a coin object, an object image produced by a computer was displayed on a spatial light modulator (SLM) and used for the hologram. The reflected object beam from an SLM was interfered with a reference beam on PR polymer composite to record a hologram and simultaneously reconstructed by a red probe beam.
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de Oliveira, Ivan, and Jaime Frejlich. "Photorefractive running hologram for materials characterization." Journal of the Optical Society of America B 18, no. 3 (March 1, 2001): 291. http://dx.doi.org/10.1364/josab.18.000291.

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Kamanina, Natalie V. "Photophysics of Fullerene-Doped Nanostructures: Optical Limiting, Hologram Recording and Switching of Laser Beam." Materials Science Forum 555 (September 2007): 363–69. http://dx.doi.org/10.4028/www.scientific.net/msf.555.363.

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The fullerene-doping effect on spectral, nonlinear optical properties, and dynamic parameters of conjugated organic systems based on pyridine, polyimide, polyaniline, polyvinyl alcohol, liquid crystal, etc. has been studied. Introduction of fullerenes into these materials has been made due to their high electron affinity that allows intermolecular donor-acceptor interaction to be reinforced. The new charge transfer complex provokes new nanostructures potentials such as nonlinear transmission, laser-induced change in the refractive index, self-organization. The application of studied nanostructures in laser and display techniques, and medicine has been discussed.
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Дисертації з теми "Nonlinear hologram"

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Bakhtiari, Nejad Marjan. "Dynamics of Multi-functional Acoustic Holograms in Contactless Ultrasonic Energy Transfer Systems." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/102414.

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Contactless ultrasonic power transfer (UPT), using piezoelectric transducers, is based on transferring energy using acoustic waves, in which the waves are generated by an acoustic source or transmitter and then transferred through an acoustic medium such as water or human tissue to a sensor or receiver. The receiver then converts the mechanical strain induced by the incident acoustic waves to electricity and delivers to an electrical load, in which the electrical power output of the system can be determined. The execution and efficiency of this technology can be significantly enhanced through patterning, focusing, and localization of the transmitted acoustic energy in space to simultaneously power pre-determined distributed sensors or devices. A passive 3D-printed acoustic hologram plate alongside a single transducer can generate arbitrary and pre-designed ultrasound fields in a particular distance from the hologram mounted on the transmitter, i.e., a target plane. This dissertation presents the use of these simple, cost-effective, and high-fidelity acoustic holograms in UPT systems to selectively enhance and pattern the electrical power output from the receivers. Different holograms are numerically designed to create single and multi-focal pressure patterns in a target plane where an array of receivers are placed. The incident sound wave from a transmitter, after passing through the hologram, is manipulated, hence, the output field is the desired pressure field, which excites the receivers located at the pre-determined focal points more significantly. Furthermore, multi-functional holograms are designed to generate multiple images at different target planes and driving frequencies, called, respectively, multi-image-plane and multi-frequency patterning holograms. The multiple desired pressure distributions are encoded on the single hologram plate and each is reconstructed by changing the axial distance and by switching the frequency. Several proof-of-concept experiments are performed to verify the functionality of the computationally designed holograms, which are fabricated using modern 3D-printers, i.e., the desired wavefronts are encoded in the hologram plates' thickness profile, being input to the 3D-printer. The experiments include measurement of output pressure fields in water using needle hydrophones and acquisition of receivers' voltage output in UPT systems. Another technique investigated in this dissertation is the implementation of acoustic impedance matching layers deposited on the front leading surface of the transmitter and receiver transducers. Current UPT systems suffer from significant acoustic losses through the transmission line from a piezoelectric transmitter to an acoustic medium and then to a piezoelectric receiver. This is due to the unfavorable acoustic impedance mismatch between the transducers and the medium, which causes a narrow transducer bandwidth and a considerable reflection of the acoustic pressure waves at the boundary layers. Using matching layers enhance the acoustic power transmission into the medium and then reinforce the input as an excitation into the receiver. Experiments are performed to identify the input acoustic pressure from a cylindrical transmitter to a receiver disk operating in the 33-mode of piezoelectricity. Significant enhancements are obtained in terms of the receiver's electrical power output when implementing a two-layer matching structure. A design platform is also developed that can facilitate the construction of high-fidelity acoustically matched transducers, that is, the material layers' selection and determination of their thicknesses. Furthermore, this dissertation presents a numerical analysis for the dynamical motions of a high-intensity focused ultrasound (HIFU)-excited microbubble or stable acoustic cavitation, which includes the effects of acoustic nonlinearity, diffraction, and absorption of the medium, and entails the problem of several biomedical ultrasound applications. Finally, the design and use of acoustic holograms in microfluidic channels are addressed which opens the door of acoustic patterning in particle and cell sorting for medical ultrasound systems.
Doctor of Philosophy
This dissertation presents several techniques to enhance the wireless transfer of ultrasonic energy in which the sound wave is generated by an acoustic source or transmitter, transferred through an acoustic medium such as water or human tissue to a sensor or receiver. The receiver transducer then converts the vibrational energy into electricity and delivers to an electrical load in which the electrical power output from the system can be determined. The first enhancement technique presented in this dissertation is using a pre-designed and simple structured plate called an acoustic hologram in conjunction with a transmitter transducer to arbitrarily pattern and shape ultrasound fields at a particular distance from the hologram mounted on the transmitter. The desired wavefront such as single or multi-focal pressure fields or an arbitrary image such as a VT image pattern can simply be encoded in the thickness profile of this hologram plate by removing some of the hologram material based on the desired shape. When the sound wave from the transmitter passes this structured plate, it is locally delayed in proportion to the hologram thickness due to the different speed of sound in the hologram material compared to water. In this dissertation, various hologram types are designed numerically to implement in the ultrasonic power transfer (UPT) systems for powering receivers located at the predetermined focal points more significantly and finally, their functionality and performances are verified in several experiments. Current UPT systems suffer from significant acoustic losses through the transmission from a transmitter to an acoustic medium and then to a receiver due to the different acoustic impedance (defined as the product of density and sound speed) between the medium and transducers material, which reflects most of the incident pressure wave at the boundary layers. The second enhancement technology addressed in this dissertation is using intermediate materials, called acoustic impedance matching layers, bonded to the front side of the transmitter and receiver face to alleviate the acoustic impedance mismatch. Experiments are performed to identify the input acoustic pressure from a transmitter to a receiver. Using a two-layer matching structure, significant enhancements are observed in terms of the receiver's electrical power output. A design platform is also developed that can facilitate the construction of high-fidelity acoustically matched transducers, that is, the material layers' selection and determination of their thicknesses. Furthermore, this dissertation presents a numerical analysis for the dynamical motions of a microbubble exposed to a high-intensity focused ultrasound (HIFU) field, which entails the problem of several biomedical ultrasound applications such as microbubble-mediated ultrasound therapy or targeted drug delivery. Finally, an enhancement technique involving the design and use of acoustic holograms in microfluidic channels is addressed which opens the door of acoustic patterning in particle and cell sorting for medical ultrasound systems.
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Erbschloe, D. R. "Nonlinear effects in photorefractive crystals." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233532.

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Братова, Дар'я Романівна. "Формування вейвлет вікон для фільтрації оптичної інформації". Master's thesis, КиЇв, 2019. https://ela.kpi.ua/handle/123456789/30424.

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Анотація:
Дисертаційна робота присвячена розробці методу для оптичної обробки інформації. В інженерній практиці для дослідження різноманітних сигналів природного та штучного походження застосовуються різні класи перетворень – Фур’є, Лапласа тощо. З 80-х років минулого століття для частотночасового аналізу нестаціонарних сигналів переважно використовують вейвлетперетворення (ВП). Першими це зробили Морле та Гроссман, займаючись аналізом сейсмічних даних та когерентними квантовими станами відповідно. Математичні засади ВП було закладено Мейєром, який показав існування відповідних функцій (вейвлетів), що утворюють ортогональний базис в просторі L2(R), тобто в просторі дійсних функцій, квадрат котрих є інтегрованим. Добеші здійснила перехід від неперервного до дискретного ВП та розробила клас вейвлетів, що мають максимальну гладкість при фіксованій довжині свого носія. Наразі область застосування ВП – наближення функцій і сигналів, їх фільтрація та стиснення, пошук в сигналі певних особливостей тощо. Магістерська дисертація складається з чотирьох розділів. У першому розділі проаналізовано основні переваги і недоліки вейвлет та Фур’є перетворень та особливості їх використання. Також приведено приклади основних типів вейвлетів. У другому розділі приведено загальну класифікацію вейвлетів та кожного з загальних окремо. Окрім цього розглянуто узагальнені характеристики різноманітних вейвлетів та методи їх розрахунку. Третій розділ присвячено розробці метода формування вейвлет вікон для фільтраціі оптичної інформації. В третьому підрозділі продемонстровані результати аналізу експериментальних робіт попередників, які показують можливість створення синтезованих цифрових нелінійних голограм у якості вейвлет-фільтрів. Четвертий розділ присвячено розробці стартап-проекту «Формування вейвлет вікон для фільтрації оптичної інформації» і аналізу перспектив входження розробки на ринок з маркетологічної точки зору.
The dissertation is dedicated to developing a method for optical information processing. In engineering practice, different classes of transformation - Fourier, Laplace, etc. - are used to investigate the various signals of natural and artificial origin. Since the 1980s, wavelet transform (WF) has been predominantly used for frequency analysis of unsteady signals. Morle and Grossman were the first to do so, analyzing seismic data and coherent quantum states, respectively. The mathematical foundations of the WT were laid down by Meyer, who showed the existence of corresponding functions (wavelets) forming an orthogonal basis in the space L2 (R), that is, in the space of real functions whose square is integrated. Dobeshi made the transition from continuous to discrete WT and developed a class of wavelets that have maximum smoothness at a fixed length of their carrier. Currently, the scope of the WT is the approximation of functions and signals, their filtering and compression, searching for a signal of certain features, and more. The master's thesis consists of four sections. The first section analyzes the main advantages and disadvantages of wavelet and Fourier transforms and the features of their use. Examples of the main types of wavelets are also given. The second section provides a general classification of wavelets and each of them in general. In addition, the general characteristics of various wavelets and their calculation methods are considered. The third section is devoted to the development of a method of forming wavelet windows for filtering optical information. The third section presents the results of an analysis of the previous experimental works that show the possibility of creating synthesized digital nonlinear holograms as wavelet filters. The fourth section is devoted to the development of a startup project "Formation of wavelet windows for filtering optical information" and to analyze the prospects of entering the market from a marketing point of view.
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Zhang, Xuan-Ting, and 張軒庭. "Theoritical analysis of the linear/nonlinear digital hologram." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/96523788043184902374.

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Filippov, Oleg. "Vectorial beam coupling in fast photorefractive crystals with AC-enhanced response." Doctoral thesis, 2004. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2004092812.

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Анотація:
We develop a theory of vectorial wave coupling in cubic photorefractive crystals placed in an alternating ac-field to enhance the nonlinear response. First we analytically and numerically investigate the dependences of the first Fourier harmonics of the space-charge field, induced in an AC-biased sillenite crystal by a light-interference pattern, on the light contrast m. The data obtained was used to extend the vectorial beam-coupling theory on the whole contrast region. In particular, we proved in the general case that despite of essential differences between thediffusion and AC nonlocal responses the later keeps the light interference fringes straight during the interaction. This fundamental feature allows, under certain restrictions, to reduce the nonlinear problem of vectorial coupling to the known linear problem of vectorial Bragg diffraction from a spatially uniform grating, which admits an exact solution. As a result, the nonlinear vectorial problem can be effectively solved for a number of practically important cases.The developed theory was applied to describe the transformation of a momentary phase changes of one of the input beams into the output intensity modulation (so-called grating translation technique). In contrast to the previous studies, we take into account the change of the space-charge field amplitude across the crystal (the coupling effects). The theory developed is employed to optimize the conditions for the linear signal detection under polarization filtering for the transverse and longitudinal optical configurations. We also analyze the possibility of the linear detection without polarization filtering.Illumination of AC-biased photorefractive BTO crystals with a coherent light beam results in development of strong nonlinear scattering. We investigate the angular and polarization characteristics of the scattered light for the diagonal optical configuration and different polarization states of the pump.
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Книги з теми "Nonlinear hologram"

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Faulkner, William. These 13: Holograph manuscripts and typescripts. New York: Garland Pub., 1987.

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Faulkner, William. Short stories: Holograph manuscripts and typescripts. New York: Garland Pub., 1987.

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Частини книг з теми "Nonlinear hologram"

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Földvári, I., C. Denz, J. Petter, F. Visinka, and Á. Péter. "Progress in Hologram Writing in Bi2TeO5 Crystals." In Nonlinear Optics for the Information Society, 105. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-015-1267-1_20.

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Andreoni, A., M. Bondani, M. A. C. Potenza, E. Puddu, and Y. N. Denisyuk. "Feasibility of All-Optical Computation by Second Harmonic Generated Holograms." In Nonlinear Optics for the Information Society, 51–54. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-015-1267-1_8.

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KOGELNIK, HERWIG. "Coupled Wave Theory for Thick Hologram Gratings." In Landmark Papers on Photorefractive Nonlinear Optics, 133–71. WORLD SCIENTIFIC, 1995. http://dx.doi.org/10.1142/9789812832047_0016.

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"Model of the stored photorefractive hologram in amorphous organic media." In Advances in Nonlinear Optics. CRC Press, 2004. http://dx.doi.org/10.1201/9780203506615.ch3.

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HEATON, J. M., and L. SOLYMAR. "Transient energy transfer during hologram formation in photorefractive crystals." In Landmark Papers on Photorefractive Nonlinear Optics, 223–34. WORLD SCIENTIFIC, 1995. http://dx.doi.org/10.1142/9789812832047_0024.

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Zhao, Feng, and Hanying Zhou. "Spectral and Spatial Diffraction in a Nonlinear Photorefractive Hologram." In Photorefractive Optics, 105–29. Elsevier, 2000. http://dx.doi.org/10.1016/b978-012774810-8/50006-1.

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STAEBLER, D. L., and J. J. AMODEI. "THERMALLY FIXED HOLOGRAMS IN LiNb03." In Landmark Papers on Photorefractive Nonlinear Optics, 181–87. WORLD SCIENTIFIC, 1995. http://dx.doi.org/10.1142/9789812832047_0018.

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Yeh, Pochi, Arthur E. T. Chiou, and John Hong. "Optical interconnection using photorefractive dynamic holograms." In Landmark Papers on Photorefractive Nonlinear Optics, 547–50. WORLD SCIENTIFIC, 1995. http://dx.doi.org/10.1142/9789812832047_0077.

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Mok, F. H., M. C. Tackitt, and H. M. Stoll. "Storage of 500 high-resolution holograms in a LiNbO3 crystal." In Landmark Papers on Photorefractive Nonlinear Optics, 515–17. WORLD SCIENTIFIC, 1995. http://dx.doi.org/10.1142/9789812832047_0073.

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Rakuljic, George A., Victor Leyva, and Amnon Yariv. "Optical data storage by using orthogonal wavelength-multiplexed volume holograms." In Landmark Papers on Photorefractive Nonlinear Optics, 519–21. WORLD SCIENTIFIC, 1995. http://dx.doi.org/10.1142/9789812832047_0074.

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Тези доповідей конференцій з теми "Nonlinear hologram"

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Mazur, L. M., S. Liu, W. Krolikowski, and Y. Sheng. "Perfect Vortices via Second Harmonic Generation In Optically Induced Nonlinear Hologram." In Nonlinear Photonics. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/np.2020.npw2d.7.

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Liu, Qiuping, and Xingdao He. "Nonlinear spectral properties of volume hologram." In Photonics Asia 2004, edited by Yunlong Sheng, Dahsiung Hsu, Chongxiu Yu, and Byoungho Lee. SPIE, 2005. http://dx.doi.org/10.1117/12.577251.

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Polyanskii, Peter V. "Heteroassociative data reconstruction by nonlinear hologram-based double phase conjugation." In 19th Congress of the International Commission for Optics: Optics for the Quality of Life, edited by Giancarlo C. Righini and Anna Consortini. SPIE, 2003. http://dx.doi.org/10.1117/12.524822.

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Chen, Da-Qing, Ji-Hua Gu, and Hao Zhou. "Computer-generated hologram with phase retrieval algorithm and nonlinear amplitude limiting." In 2011 4th International Congress on Image and Signal Processing (CISP). IEEE, 2011. http://dx.doi.org/10.1109/cisp.2011.6100278.

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