Bibliografie tematiche / Brillouin scattering

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Letteratura scientifica selezionata sul tema "Brillouin scattering"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 9 giugno 2025

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Articoli di riviste sul tema "Brillouin scattering"

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GUERRA, R., J. T. MENDONÇA e P. K. SHUKLA. "Stimulated Raman, Brillouin and dust–Brillouin scattering in dusty plasmas". Journal of Plasma Physics 59, n. 2 (febbraio 1998): 343–65. http://dx.doi.org/10.1017/s002237789700620x.

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Stimulated scatterings of large-amplitude electromagnetic waves by Langmuir, dust–ion-acoustic and dust-acoustic waves in unmagnetized dusty plasmas are investigated by employing the standard methods of nonlinear three-wave interactions and by incorporating the effects of grain-charge fluctuations, collisions of electrons and ions with dust grains, the plasma drag on a dust grain (for the case of the dust-acoustic wave) and the dependence of the average dust charge on the dusty plasma parameters. Distinction is made between the charging collisions, when electrons and ions are accumulated onto the grain surface; and Coulomb collisions, when electrons and ions are simply deflected from the grain surface. We investigate the regimes for which Coulomb collisions can be treated under the small-angle-deflection approximation. If the intergrain average spacing is equal to or smaller than the Debye length, the collision frequencies of plasma species with dust grains can be much larger than any collision frequency of the plasma species amongst themselves. In the case of Brillouin stimulated scattering, other important contributions to damping come from Landau and dust-charge fluctuation damping. In the case of dust–Brillouin stimulated scattering, the most important contribution to damping comes from dust-charge fluctuation (if the intergrain average spacing is equal to or smaller than the Debye length) and plasma drag on the dust particles (if the intergrain average spacing is larger than the Debye length). We derive the instability thresholds as a function of the density of the dust grains. Because of the inclusion of the new effects, in both Raman and Brillouin scatterings it is found that the instability threshold powers are drastically increased relative to the dust-free case. In the case of dust–Brillouin scattering, a minimum for the threshold power is found in the transition region between ‘dusty’ and ‘dust-in’ plasma. Growth rates near thresholds are also discussed.
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Ahmad Hambali, N. A. M., M. Ajiya, M. M. Shahimin, M. H. A. Wahid e M. A. Mahdi. "Single-wavelength ring-cavity fiber laser employed pre-amplification technique to reduce threshold by circulating spontaneous brillouin scattering". Indonesian Journal of Electrical Engineering and Computer Science 14, n. 1 (1 aprile 2019): 276. http://dx.doi.org/10.11591/ijeecs.v14.i1.pp276-283.

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<span>In this paper, two types of ring-cavity fiber laser structures that operate as a single wavelength laser were investigated on the threshold performance. The two structures are namely Brillouin fiber laser and Brillouin erbium fiber laser. In the first structure, the Brillouin pump signal was amplified before being injected into the laser cavity which namely as Brillouin fiber laser. Meanwhile, for second structure respectively, the Brillouin pump signal was pre-amplified in the laser cavity which namely as Brillouin Erbium fiber laser. We found that the stimulated Brillouin scattering threshold power was lowered significantly by circulating the spontaneous Brillouin scattering in the gain medium utilizing the pre-amplification technique. The optimum stimulated Brillouin scattering threshold power was about 1.4 mW, and this was achieved at optimum output coupling ratio of 95%. By comparing to the first structure in which the Brillouin pump signal was amplified before entering the laser cavity, stimulated Brillouin scattering threshold power was only achieved at 2.62 mW at a similar wavelength. The pre-amplification technique proposed in this paper has been shown to improve the performance of single-wavelength ring-cavity fiber lasers via significant reduction of the stimulated Brillouin scattering threshold power which was around 1.22 mW.</span>
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Feng, Liuyan, Yi Liu, Wenjun He, Yajun You, Linyi Wang, Xin Xu e Xiujian Chou. "Intramode Brillouin Scattering Properties of Single-Crystal Lithium Niobate Optical Fiber". Applied Sciences 12, n. 13 (26 giugno 2022): 6476. http://dx.doi.org/10.3390/app12136476.

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Ordinary step-type fiber usually has only one obvious Brillouin scattering gain peak with a low gain coefficient, resulting in a poor sensing performance. As a promising material for nonlinear photonics, lithium niobate can significantly improve the Brillouin gain due to its higher refractive index when replaced with the core material. Furthermore, the higher-order acoustic modes make the Brillouin gain spectrum exhibit multiple scattering peaks, which could improve the performance of sensors. In this study, we simulated the Brillouin scattering properties of different modes of intramode in step-index lithium niobate core fibers. We analyzed the intramode-stimulated Brillouin scattering properties of different pump–Stokes pairs for nine LP modes (LP01, LP11, LP21, LP02, LP31, LP12, LP41, LP22, and LP03) guided in fiber. The results show that both the effective refractive index and Brillouin scattering frequency shift are decreased with the increase in the nine mode orders, and the values of which are 2.2413 to 2.1963, and 21.17 to 20.73 GHz, respectively. The typical back-stimulated Brillouin scattering gain is obtained at 1.7525 m−1·W−1. These simulation results prove that the Brillouin gain of the LiNbO3 optical fiber structure can be significantly improved, which will pave the way for better distributed Brillouin sensing and for improving the transmission capacity of communication systems.
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Qiu, Jie, Liang Hao, Lihua Cao e Shiyang Zou. "Investigation of Langdon effect on the stimulated backward Raman and Brillouin scattering". Plasma Physics and Controlled Fusion 63, n. 12 (10 novembre 2021): 125021. http://dx.doi.org/10.1088/1361-6587/ac2e5b.

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Abstract In a laser-irradiated plasma, the Langdon effect makes the electron energy distribution function tend to a super-Gaussian distribution, which has important influence on laser plasma instabilities. In this work, the influence of a super-Gaussian electron energy distribution function on the convective stimulated backward Raman scattering and stimulated backward Brillouin scattering is studied systematically for a wide range of typical plasma parameters in the inertial confinement fusion. Distinct behaviors are found for stimulated Raman scattering and stimulated Brillouin scattering in the variation trend of the peak spatial growth rate and the corresponding wavelength of the scattered light. Especially, the Langdon effect on the stimulated Brillouin scattering in plasmas with different ion species and isotopes is analyzed in detail, and the parameter boundary for judging the variation trend of the peak spatial growth rate of stimulated Brillouin scattering with the super-Gaussian exponent is presented for the first time. In certain plasma parameter region, it is found that the Langdon effect could enhance stimulated Brillouin scattering in mixed plasma, which may attenuate the improvement in suppressing stimulated Brillouin scattering by mixing low-Z ions into the high-Z plasma. The comprehension of Langdon effect on stimulated Raman scattering and stimulated Brillouin scattering would contribute to a better understanding of laser plasma instabilities in experiments.
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Yu, Linfeng, Chukun Huang, Ming Cheng, Kang Wang, Haotian Shi, Qiang Huang e Junqiang Sun. "On-chip stimulated Brillouin scattering [Invited]". Chinese Optics Letters 22, n. 2 (2024): 020031. http://dx.doi.org/10.3788/col202422.020031.

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Gerakis, A., M. N. Shneider e P. F. Barker. "Coherent Brillouin scattering". Optics Express 19, n. 24 (21 novembre 2011): 24046. http://dx.doi.org/10.1364/oe.19.024046.

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Verkerk, Peter. "Neutron brillouin scattering". Neutron News 1, n. 1 (gennaio 1990): 21. http://dx.doi.org/10.1080/10448639008210194.

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Yanukovich, T. P., e A. V. Polyakov. "Simulation of Distributed Current Sensor Based on Optical Fiber Deformation". Devices and Methods of Measurements 10, n. 3 (9 settembre 2019): 243–52. http://dx.doi.org/10.21122/2220-9506-2019-10-3-243-252.

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Abstract (sommario):
Due to the development of automation and control systems, methods and devices for measuring of electric current large values are of great interest. The aim of the work was to develop a schematic diagram of a distributed current strength sensor based on the Brillouin optical frequency domain analysis; to create a mathematical model of the sensor to demonstrate its work and to calculate the basic parameters of the sensor. To provide the measurement optical fiber with conductive coating is used. Between the current bus, where current is measured, and conductive coating the Ampere force arises. Strain occurs in optical fiber due to this force. Stimulated Brillouin scattering has the strain dependent characteristic frequency. Shift of the characteristic frequency allows to measure current in the bus. To measure the characteristic frequency and the location of its shift Brillouin optical frequency domain analysis is used.The mathematical model of sensor operation based on tree-wave model of stimulated Brillouin scattering is demonstrated. This model allows calculating intensity of optical signal in the fiber in dependence of characteristic frequency shift. Brillouin optical frequency domain analysis uses inverse Fourier transform to obtain pulse response.A schematic diagram of a distributed current sensor based on the method of Brillouin optical frequency domain analysis is presented. An a priori estimate of parameters of the measuring system was carried out on the basis of the mathematical model of stimulated Brillouing scattering in an optical fiber. The spatial resolution of the sensor when determining the length and location of fiber sections was 0.06 m. The resolution of the sensor was 0.22 kA, the maximum value of the current strength was 25 kA. Dependence of the sensor operation at different powers of the laser used was investigated. The refractive index change influence on the result of measurements was estimated.
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Bogachkov, I. V., e N. I. Gorlov. "Determination of the Mandelstam – Brillouin Scatter Frequency Characteristic in Optical Fibers of Various Types". Journal of Physics: Conference Series 2182, n. 1 (1 marzo 2022): 012089. http://dx.doi.org/10.1088/1742-6596/2182/1/012089.

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Abstract The results of researches of the Mandelstam – Brillouin scattering frequency characteristics in single-mode optical fibers of various types are presented in this paper. A technique for obtaining the spectral characteristics of Mandelstam – Brillouin scattering for predefined acoustic mode distributions in single-mode optical fibers is considered. The procedure for determining the frequency characteristics of the Mandelstam – Brillouin scattering for a given structure of the radial distribution of the optical fiber refractive index is discussed. The Mandelstam – Brillouin scattering frequency characteristics of single-mode optical fibers obtained by mathematical modeling and experimental studies are presented. A comparative analyze of obtained results is carried out.
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Gao, Jing, Linbo Zhang, Dongdong Jiao, Guanjun Xu, Jiayu Bu, Mengfan Wu, Qi Zang et al. "Analysis and Reduction of Nonlinear Effects in Optical Fiber Frequency Transfer". Applied Sciences 13, n. 23 (28 novembre 2023): 12762. http://dx.doi.org/10.3390/app132312762.

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Nonlinear effects in optical fiber frequency transfer have a significant impact on the precision of frequency transfer. We investigate the main nonlinear effects, including the Brillouin scattering and the Raman scattering, in optical fiber frequency transfer through theoretical and simulation calculations in detail. The calculation results show that the threshold powers of the Brillouin scattering and the Raman scattering decrease with the increase in the fiber length; however, the fiber length has little to no impact on the threshold powers when the fiber length is greater than 10 km. The threshold powers, including the Brillouin scattering and the Raman scattering, increase as the attenuation coefficient increases. Conversely, when it comes to the gain coefficients, the outcomes exhibit a reverse trend. When the linewidth Δvlaser of the laser source is from 1 Hz to 1 MHz, the linewidth Δvlaser does not affect the threshold powers of the Brillouin scattering. This study seeks to offer design guidance aimed at mitigating nonlinear effects in optical fiber frequency transfer. The calculated results hold considerable potential in guiding various applications reliant on Brillouin and Raman scattering properties, such as laser technology and optical fiber sensing.
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Più fonti

Tesi sul tema "Brillouin scattering"

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Gleed, D. G. "Brillouin scattering from organic layers". Thesis, University of Exeter, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232975.

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BELL, JOHN A. "BRILLOUIN SCATTERING FROM METAL SUPERLATTICES". Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184045.

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Acoustic modes guided by thin-film metal superlattices have been investigated using Brillouin spectroscopy. Samples were grown on both single-crystal sapphire and fused silica substrates by alternately sputtering two different metals to yield a total thickness in the range 0.3 - 0.5 μm. Structural and chemical characterization of the polycrystalline films was performed using x-ray diffraction. Rutherford backscattering and optical interferometry. Thermally excited acoustic waves in the metal film create a surface ripple which weakly interacts with light incident from a single mode argon laser. A tandem Fabry-Perot consisting of two synchronized 3-pass cavities is used to measure the frequency shift of light which is inelastically scattered from acoustic waves. The contrast ratio of this interferometer exceeds 10¹⁰ and provides sufficient stray light rejection to detect the surface Rayleigh wave and as many as 13 higher order acoustic modes. The elastic stiffness constants of the anisotropic superlattices were estimated by fitting the measured acoustic mode velocities to a parameterized acoustic model. A comparison is made between these elastic constants and those predicted from the properties of the separate bulk constituents. The dependence of bilayer wavelength on the elastic properties of both Cu/Nb and Mo/Ta superlattices over the range of roughly 10 to 200 Å was determined. The unexpected softening of Cu/Nb superlattices within a range of bilayer wavelengths near 20 Å which was reported previously is qualitatively similar to the measurements reported here. It is shown that the elastic stiffness coefficient with the largest variation is c₄₄. The stiffness variations determined for the Mo/Ta samples are much smaller than for Cu/Nb. It is suggested that this is due to either structural differences (Cu/Nb is fcc-bcc and Mo/Ta is bcc-bcc) or the smaller interfacial lattice mismatch for Mo/Ta. Interfacial strain is found to be strongly correlated with the stiffness variations of the Mo/Ta samples. However, the underlying cause of these variations in stiffness remains anomalous. This dissertation also reports the first observations of Love waves and Stoneley waves by Brillouin scattering. The purely transverse Love waves guided by Cu/Nb films were detected by elasto-optic scattering from the evanescent acoustic strain in the sapphire substrate. The stiffness coefficient c₁₂ of the hexagonally symmetric metal film cannot be determined by the other guided acoustic waves which ripple the surface. Molybdenum in contact with fused silica is predicted to support a Stoneley wave which is guided by the interface. The lowest order Sezawa made guided by a molybdenum film was found to evolve to the Stoneley wave as the film becomes thicker. These measurements together with measurements of the surface Rayleigh wave show that the stiffness of the sputtered metal films is quite homogeneous and independent of film thickness.
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Florez, Peñaloza Omar Enrique 1986. "Brillouin scattering in silica microwires = Espalhamento Brillouin em microfios de sílica". [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276914.

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Orientador: Paulo Clóvis Dainese Júnior
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
Made available in DSpace on 2018-08-29T15:49:49Z (GMT). No. of bitstreams: 1 FlorezPenaloza_OmarEnrique_M.pdf: 35304158 bytes, checksum: f1b7fbb7d6036f3186dd9378d06e850e (MD5) Previous issue date: 2015
Resumo: O Espalhamento Brillouin e um processo nao linear oriundo da interacao entre ondas opticas e acusticas. Este efeito foi amplamente estudado em fibras mono-modo e mais recentemente em uma grande variedade de micro-estruturas fotonicas. A habilidade de se fabricar estruturas que podem confinar ambas as ondas opticas e acusticas em dimensoes menores que o comprimento de onda criou novas oportunidades de se estudar a interacao foton-fonon. Um aspecto em particular que se torna importante em sistemas de alto confinamento e o efeito de deslocamento de borda (Shifting-Boundary), alem do efeito Elasto-Optico, mais bem entendido. Micro-fios de Silica sao ideais para estudar estes efeitos. Primeiro, quando seu diametro e menor que o comprimento de onda, o campo eletrico na superficie do guia de onda aumenta significativamente. Em segundo lugar, a interface ar-silica apresenta um alto contraste de indice de refracao, o que aumenta o espalhamento devido ao efeito de deslocamento de borda. Finalmente, a geometria cilindrica simples permite um calculo analitico da eficiencia do espalhamento Brillouin, considerando as perturbacoes tanto Elasto-Opticas como de Deslocamento de Borda. Nesta tese, estudamos teorica e experimentalmente o espalhamento Brillouin em microfios de Silica. Amostras com diametros de 0.6 a 3 ¿Êm foram fabricadas e caracterizadas utilizando um sistema de deteccao heterodina para os espalhamentos co-propagante e contra-propagante. Para o espalhamento Brillouin co-propagante, usamos a tecnica de bombeio e prova para induzir excitacao impulsiva dos modos acusticos proximos da frequencia de corte. Espalhamento devido a ondas acusticas do tipo Rayleigh foi observado e extensivamente caracterizado. Estas ondas sao particularmente interessantes, ja que a maior parte da energia acustica e concentrada proxima da superficie do guia de onda, o que aumenta a contribuicao do efeito de Deslocamento de Borda. Desenvolvemos estudos teoricos extensivos dos modos opticos e acusticos na geometria cilindrica, e aplicamos a teoria de modos acoplados para calcular a eficiencia de espalhamento para cada modo acustico. Um estudo da eficiencia de espalhamento em funcao do diametro foi feito, ajudando a entender melhor os mecanismos que determinam a evolucao do espectro Brillouin. Finalmente, fomos capazes de identificar modos nos quais o processo de espalhamento e dominado pelo efeito de Deslocamento de Borda, e modos nos quais o efeito dominante e o Elasto-Optico. Este entendimento pode contribuir no projeto de estruturas nas quais estes efeitos sao somados ou cancelados, e pode ser usado como outro mecanismo para controlar o processo de espalhamento Brillouin
Abstract: Brillouin scattering is a nonlinear process that arises from the interaction between op- tical and acoustic waves. This effect has been widely studied in standard single-mode fibers and more recently in a variety of photonics microstructures. The ability to fab- ricate structures that can confine both optical and acoustic waves in sub-wavelength dimensions has created new opportunities to study photon-phonon interaction. One particular aspect that becomes important in high-confinement systems is the effect of shifting boundaries, in addition to the better-understood elasto-optic effect. Silica mi- crowires are ideal systems to study these effects. First, when its diameter is smaller than the wavelength, the electric field overlaps strongly with the waveguide surface. Second, the air-silica interface presents high index contrast, which enhances scattering due to shifting boundary effect. Finally, the simple cylindrical geometry allows an- alytical calculation of Brillouin scattering efficiency considering both elasto-optic and shifting-boundary perturbations. In this thesis, we studied theoretically and experimentally Brillouin scattering in silica microwires. Samples with diameter ranging from 0.6 to 3 ?m were fabricated and char- acterized using heterodyne detection for both backward and forward Brillouin scattering. For forward Brillouin scattering, we used the pump and probe technique to induce impul- sive excitation of acoustic modes near cutoff. Scattering due to Rayleigh acoustic waves was observed and extensively characterized. These waves are particularly interesting as most of the acoustic energy is concentrated close to the waveguide surface, therefore enhancing the shifting boundary contribution. Theoretically, we developed extensive studies of optical and acoustic modes in cylindrical geometry, and applied coupled-mode theory to calculate the scattering efficiency for each acoustic mode. A study of the scat- tering efficiencies as a function of diameter was performed, helping better understand the mechanisms that determined the evolution of the Brillouin spectrum. Finally, we were able to identify modes in which the scattering process is dominated by shifting- boundary effect and modes in which elasto-optic dominates. This understanding may help design structures in which these effects add or cancel each other, and can be used as another mechanism to control Brillouin scattering process
Mestrado
Física
Mestre em Física
1142161/2012
CAPES
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4

Antonacci, Giuseppe. "Brillouin scattering microscopy for mechanical imaging". Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/24452.

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In a world where science is constantly challenged to solve problems of increasing complexity, light is paving new ways to gather information about the physical properties of matter. Among these properties, elasticity is becoming fundamental in the understanding and the diagnosis of several diseases. Current solutions to gather mechanical information, however, measure the response of a material to an applied excitation, which makes them invasive and limited by a low spatial resolution. In contrast with these techniques, Brillouin spectroscopy offers the unique solution to retrieve stiffness information from the spectrum of the light scattered by inherent thermal acoustic waves. The combination of Brillouin spectroscopy with confocal microscopy has yielded a confocal Brillouin microscope able to perform mechanical imaging in a non-invasive manner. This was used to investigate two different biological problems: on the one hand the stiffness variations in specific endothelium cells of the eye, aiming at a better understanding of the mechanisms responsible for glaucoma, and on the other the characterisation of the mechanical structures of blood vessels, which could provide fundamental information regarding the formation of atherosclerotic plaques. Following an investigation on the optimal geometry that minimises the spectral broadening caused by the collection of photons over a range of scattering angles, high resolution Brillouin imaging was obtained in a confocal backscattering arrangement. To the best of our knowledge this thesis presents, for the first time, sub-cellular Brillouin images. In particular, in vitro Brillouin images of single HUVEC cells were acquired to investigate the cell's mechanical response to the application of the Latrunculin-A drug. This analysis, together with the finding of a linear correlation between the Brillouin modulus and the standard Young's modulus, validates the technique as a feasible means of measuring stiffness. Following this assessment, Brillouin images of normal and diseased vessels were acquired showing that the atherosclerotic plaques had a lower stiffness compared to both diseased and healthy vessel walls. These results might encourage the application of confocal Brillouin microscopy as the tool of choice for the investigation of the arterial biomechanics.
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Samaniego, Riera Diego Paul. "OPTICAL PROCESSING BASED ON BRILLOUIN SCATTERING". Doctoral thesis, Universitat Politècnica de València, 2019. http://hdl.handle.net/10251/124820.

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[ES] Los efectos no lineales son herramientas valiosas en el procesamiento óptico. El obje-tivo de esta Tesis es contribuir con las nuevas arquitecturas y métodos a este campo, en particular al control de la polarización de la luz con luz y filtrado óptico de señales de microondas. La manipulación de las propiedades de la polarización de la luz en medios guiados es crucial en muchos sistemas ópticos clásicos y cuánticos. Sin embargo, la capacidad de la tecnología actual para definir con precisión el estado de polarización de determina-das longitudes de onda está lejos del nivel de madurez conseguido en el control de la amplitud. En el capítulo 3, se presenta un nuevo enfoque para el control totalmente óptico del estado de polarización con selectividad en longitud de onda, basado en el cambio del retardo fase por medio del stimulated Brillouin scattering. Los experimen-tos muestran que se puede llegar a cualquier punto de la esfera de Poincaré desde un estado de polarización de entrada arbitrario con tan solo una ligera variación en la amplitud de la señal (<2.5 dB). A diferencia de otros esquemas de procesamiento Bri-llouin, la degradación de la figura de ruido es pequeña (1.5 dB para una rotación completa en la esfera, 2pi). Este controlador de polarización completamente óptico puede forjar el desarrollo de nuevas técnicas basadas en la polarización en comunica-ciones ópticas, ingeniería laser, detección, sistemas cuánticos y sondeo basado en luz de sistemas químicos y biológicos. La segunda área de interés de la tesis se centra en el filtrado fotónico de microondas. La fotónica proporciona una implementación alternativa a los filtros de microondas. Las características proporcionadas por el scattering de Brillouin son muy atractivas para el diseño de filtro con especificaciones competitivas. El capítulo 4 está dedicado a los nuevos esquemas para el filtrado fotónico de microondas basado en SBS. En parti-cular, se presenta un método para mejorar la pendiente de los filtros fotónicos de mi-croondas basados en Brilouin. Esta mejora se logra mediante la combinación de las respuestas en ganancia y atenuación del Brillouin sobre la señal modulada en fase. Los resultados experimentales muestran una respuesta paso banda que exhibe una pendiente de 16.7 dB por octava, lo que corresponde con una mejora de 3 veces en comparación con la respuesta Lorentziana natural de la ganancia Brillouin. Sin embargo, la necesi-dad de 3 ondas de bombeo, es decir tres osciladores de microondas, incrementan la complejidad del sistema y dificulta la capacidad de ajuste. Para superar estas limita-ciones, se propone una segunda técnica para mejorar la pendiente de un filtro fotónico de microondas basado en scattering de Brillouin estimulado, el cual mantiene una fácil sintonización. Esta propuesta se basa en la dependencia de la polarización de la ganan-cia del Brillouin en fibras birrefringentes. La presencia de dos respuestas ortogonales de ganancia/atenuación Brillouin en fibras birrefringentes da como resultado dos res-puestas del filtro, que pueden ser sustraídas en un fotodetector balanceado para elimi-nar el lento decaimiento de la respuesta de ganancia natural Lorentziana del Brillouin. Los resultados experimentales muestran que se puede obtener una pendiente del filtro de 8.3 dB/oct. Finalmente, el documento de tesis proporciona conclusiones y actividades futuras abiertas por este trabajo de doctorado.
[CAT] Els efectes no lineals son ferramentes valuoses en el processament òptic. L'objectiu d'aquesta tesi es contribuir amb les noves arquitectures i mètodes a aquest camp, en particular al control de la polarització de la llum amb llum i filtrar òptic de senyals de microones. La manipulació de les propietats de la polarització de la llum en mitjans guiats es cru-cial en molts sistemes òptics clàssics i quàntics. No obstant això, la capacitat de la tecnologia actual per definir amb precisió l'estat de polarització de determinades lon-gituds d'ona està lluny del nivell de maduresa aconseguit en el control de l'amplitud. En el capítol 3, es presenta un nou enfocament per al control totalment òptic de l'estat de polarització amb selectivitat en longitud d'ona, basat en el canvi del retard de fase mitjançant el stimulated Brillouin scattering. Els experiments mostren que es pot arri-bar a qualsevol punt de l'esfera de Poincaré des d'un estat de polarització d'entrada arbitrari amb tant sols una lleugera variació de l'amplitud de la senyal (<2.5 dB). A diferencia d'altres esquemes de processament Brillouin, la degradació de la figura de soroll es petita (1.5 dB per a una rotació completa en l'esfera, 2pi). Aquest controlador de polarització completament òptic pot forjar el desenvolupament de noves tècniques basades en la polarització en comunicacions òptiques, enginyeria làser, detecció, sis-temes quàntics y sondeig basat en llum de sistemes químics i biològics. La segona àrea d'interès de la tesi es centra en el filtrar fotònic de microones. La fo-tònica proporciona una implementació alternativa als filtres de microones. Les caracte-rístiques proporcionades per el scattering de Brillouin son molt atractives per al dis-seny de filtres amb especificacions competitives. El capítol 4 està dedicat als nous esquemes per al filtrat fotònic de microones basat en SBS. En particular, es presenta un mètode per a millorar la pendent dels filtres fotònics de microones basats en Bri-llouin. Aquesta millora s'aconsegueix mitjançant la combinació de les respostes en guany i atenuació del Brillouin sobre la senyal modulada en fase. Els resultats experi-mentals mostren una resposta pas banda que exhibeix una pendent de 16.7 dB per octava, el que correspon amb una millora de 3 vegades en comparació amb la resposta Lorentziana natural del guany Brillouin. Tot i això, la necessitat de 3 ones de bom-beig, es a dir tres oscil·ladors de microones, incrementen la complexitat del sistema i dificulta la capacitat d'ajust. Per superar aquestes limitacions, es proposa una segona tècnica per millorar la pendent d'un filtre fotònic de microones basat en scattering de Brillouin estimulat, el qual manté una fàcil sintonització. Aquesta proposta es basa en la dependència de la polarització del guany del Brillouin en fibres birefringents. La presència de dos respostes ortogonals de guany/atenuació Brillouin en fibres birefrin-gents dona com a resultat dos respostes del filtre, que poden ser sostretes en un fotode-tector balancejat per eliminar el lent decaïment de la resposta de guany natural Lo-rentziana del Brillouin. Els resultats experimentals mostren que es pot obtenir una pendent del filtre de 8.3 dB/oct. Finalment, el document de tesi proporciona conclusions i activitat futures obertes per aquest treball de doctorat.
[EN] Nonlinear effects are valuable tools in the field of optical processing. This Thesis is aimed at contributing with new architectures and methods to this field, in particular to the light-by-light control of polarization and optical filtering of microwave signals. The manipulation of the polarization properties of light in guided media is crucial in many classical and quantum optical systems. However, the capability of current technology to finely define the state of polarization of particular wavelengths is far from the level of maturity in amplitude control. In Chapter 3, a new approach for all-optical control of the state of polarization with wavelength selectivity based on the change of the phase retardance by means of stimulated Brillouin scattering is present-ed. Experiments show that any point on the Poincaré sphere can be reached from an arbitrary input state of polarization with little variation of the signal amplitude (< 2.5 dB). Unlike other Brillouin processing schemes, the degradation of the noise figure is small (1.5 dB for a full 2pi rotation). This all-optical polarization controller can forge the development of new polarization-based techniques in optical communication, laser engineering, sensing, quantum systems and light-based probing of chemical and biological systems. The second area of interest of the Thesis is photonic microwave filtering. Photonics provides an alternative implementation of microwave filters. The features provided by Brillouin scattering are very attractive to design filters with competitive specifications. Chapter 4 is devoted to new schemes for photonic microwave filtering based on SBS. In particular, a method to enhance the filter slope of Brillouin-based photonic microwave filters is presented. This improvement is achieved by the combination of Brillouin gain and loss responses over phase modulated signals. The experimental results show passband responses exhibiting a slope of 16.7 dB per octave, which corresponds with a 3-fold improvement in comparison to the natural Lorentzian response for the same gain. However, the need of three pump waves, i.e. three microwave oscillators, increases the system complexity and make tunability more difficult. To overcome these limitations, a second technique to enhance the slope of a photonic microwave filter based on stimulated Brillouin scattering is proposed, that maintains easy tunability. It relies on exploiting the polarization dependence of Brillouin gain in birefringent fibers. The presence of two orthogonal Brillouin gains/loss in birefringent fibers results in two filter responses that can be subtracted in a balanced photodetector to remove the slow Lorentzian decay of the natural Brillouin gain response. Experimental results show that a filter slope of 8.3 dB/oct can be obtained. Finally, the Thesis document provides conclusions and future activities opened by this PhD work.
Samaniego Riera, DP. (2019). OPTICAL PROCESSING BASED ON BRILLOUIN SCATTERING [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/124820
TESIS
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Afshaarvahid, Shahraam. "Transient phase conjugation using Stimulated Brillouin Scattering". Title page, abstract and table of contents only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09pha2583.pdf.

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Copies of author's previously published articles inserted. Bibliography: p. 169-176. Develops a one and three dimensional transient model of Stimulated Brillouin Scattering to investigate the transient regime of Stimulated Brillouin Scattering and recognize different transient phenomena that affect its performance.
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Cook, Gary. "Tunable dye lasers for stimulated Brillouin scattering". Thesis, University of Hull, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268295.

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Dhliwayo, Jabulani. "Stimulated Brillouin scattering for distributed temperature sensing". Thesis, University of Kent, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242858.

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Schroeder, W. A. "Optical phase conjugation by stimulated Brillouin scattering". Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46505.

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Hayder, Alaa. "Multiwavelength Brillouin semiconductor fiber lasers". Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116042.

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The past decade has seen an increased interest in multiwavelength optical sources. Various methods and technologies exist for developing multiwavelength lasers with varying features and characteristics. A particular category that has gained much interest, are multiwavelength fiber lasers that combine nonlinear gain from stimulated Brillouin scattering with linear gain from erbium doped fibers.
This thesis demonstrates experimentally a Brillouin semiconductor multiwavelength fiber laser that utilizes semiconductor optical amplifiers as the linear gain medium. This novel technique allows for multiwavelength Brillouin fiber lasers to operate in any wavelength band for which SOAs are available. We begin by demonstrating a ring cavity configuration with a single wavelength output in the C/L bands. This configuration is enhanced for multiwavelength generation by the addition of a feedback path. The setup is then implemented in the O-band to demonste that the Brillouin fiber laser can be made to operate at any wavelength. Finally, several linear cavity configurations are explored and shown to improve the performance of the multiwavelength output in the O- and C/L- bands.
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Libri sul tema "Brillouin scattering"

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J, Damzen M., e Institute of Physics (Great Britain), a cura di. Stimulated Brillouin scattering: Fundamentals and applications. Bristol: Institute of Physics Pub., 2003.

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Zadok, Avi, Hilel Hagai Diamandi, Yosef London e Gil Bashan. Forward Brillouin Scattering in Standard Optical Fibers. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-13599-6.

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3

Still, Tim. High frequency acoustics in colloid-based meso- and nanostructures by spontaneous Brillouin light scattering. Berlin: Springer-Verlag, 2010.

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1934-, Cardona Manuel, e Güntherodt G. 1943-, a cura di. Light scattering in solids. Berlin: Springer, 2000.

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Drozdowski, Mirosław. Badanie własności sprężystych i elastooptycznych monokryształów LiCsSO₄ i LiKSO₄ metodą brillouinowskiego rozpraszania światła. Poznań: Politechnika Poznańska, 1990.

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Boyle, Jonathan William. Observation of linear and nonlinear magnetostatic waves by Brillouin light scattering. Salford: University of Salford, 1995.

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Lehndorff, Michael. Brillouinstreuung an thermischen und mikrowelleninduzierten Fluktuationen in Lithium-dotiertem Kalium-Tantalat. Konstanz: Hartung-Gorre, 1986.

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United States. National Aeronautics and Space Administration., a cura di. Robust, Brillouin active embedded fiber-is-the-sensor system in smart composite structures: Grant no. NAG-1835, April 22, 1996-April 21, 1997, annual progress report. [Washington, DC: National Aeronautics and Space Administration, 1996.

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United States. National Aeronautics and Space Administration., a cura di. Robust, Brillouin active embedded fiber-is-the-sensor system in smart composite structures: Grant no. NAG-1835, April 22, 1996-April 21, 1997, annual progress report. [Washington, DC: National Aeronautics and Space Administration, 1996.

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United States. National Aeronautics and Space Administration., a cura di. Robust, Brillouin active embedded fiber-is-the-sensor system in smart composite structures: Grant no. NAG-1835, April 22, 1996-April 21, 1997, annual progress report. [Washington, DC: National Aeronautics and Space Administration, 1996.

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Capitoli di libri sul tema "Brillouin scattering"

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Schneider, Thomas. "Brillouin Scattering". In Nonlinear Optics in Telecommunications, 269–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08996-5_11.

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Weik, Martin H. "Brillouin scattering". In Computer Science and Communications Dictionary, 147. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_1867.

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Vacher, R., e E. Courtens. "Brillouin scattering". In International Tables for Crystallography, 329–35. Chester, England: International Union of Crystallography, 2006. http://dx.doi.org/10.1107/97809553602060000641.

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Vacher, R., e E. Courtens. "Brillouin scattering". In International Tables for Crystallography, 349–55. Chester, England: International Union of Crystallography, 2013. http://dx.doi.org/10.1107/97809553602060000914.

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Every, A. G., e J. D. Comins. "Surface Brillouin Scattering". In Handbook of Advanced Non-Destructive Evaluation, 1–34. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-30050-4_28-1.

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Every, Arthur G., e J. Darrell Comins. "Surface Brillouin Scattering". In Handbook of Advanced Nondestructive Evaluation, 327–59. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-26553-7_28.

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Kieffer, John. "Brillouin Light Scattering". In Modern Glass Characterization, 1–51. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119051862.ch4.

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Kruer, William L. "Stimulated Brillouin Scattering". In The Physics Of Laser Plasma Interactions, 87–94. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781003003243-8.

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Torell, L. M. "Brillouin Scattering in Ionic Liquids". In Molten Salt Chemistry, 161–80. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3863-2_7.

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Still, Tim. "Basics and Brillouin Light Scattering". In High Frequency Acoustics in Colloid-Based Meso- and Nanostructures by Spontaneous Brillouin Light Scattering, 9–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13483-8_2.

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Atti di convegni sul tema "Brillouin scattering"

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Elsayad, Kareem. "Brillouin light scattering anisotropy microscopy". In Biomedical Light Scattering XV, a cura di Adam Wax e Vadim Backman, 11. SPIE, 2025. https://doi.org/10.1117/12.3039127.

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Zhang, Hao, Shuangyou Zhang, Toby Bi, George Ghalanos, Yaojing Zhang, Haochen Yan, Arghadeep Pal, Jijun He, Shilong Pan e Pascal Del’Haye. "Soliton Frequency Combs via Cascaded Brillouin Scattering". In CLEO: Science and Innovations, SF2O.3. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_si.2024.sf2o.3.

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We present Kerr soliton generation via a forward propagating second order Brillouin scattering process in a microresonator. The solitons repetition rates are independent from the Brillouin gain frequency shift (~10 GHz in fused silica).
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Li, Pengteng, Jin Yuan e Tianhua Feng. "Metasurfaces for nonlinear Brillouin light scattering". In Micro-Nano Optics, a cura di Min Qiu, 7. SPIE, 2024. https://doi.org/10.1117/12.3047108.

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Ruszkowski, Jason A., Kyle T. Myren e Edgar A. Bering III. "Stimulated Brillouin Scattering from Satellite Transmissions". In 2025 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM), 304–6. IEEE, 2025. https://doi.org/10.23919/usnc-ursinrsm66067.2025.10906838.

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Xu, Mingyu, Peng Lei, Yunhui Bai, Zhangyuan Chen e Xiaopeng Xie. "Slow Light Enhanced On-chip Stimulated Brillouin Scattering". In CLEO: Applications and Technology, JTh2A.30. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_at.2024.jth2a.30.

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Rogovin, D. "Enhanced stimulated Brillouin scattering". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.tui6.

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It is well known that the amplitude of a laser radiation field in the vicinity of a metallic microparticle can be dramatically amplified at the surface plasma frequency. This feature of microparticle electrodynamics arises from a resonant coupling of the laser radiation field to the electronic plasma mode and has been utilized as a means to greatly enhance a variety of nonlinear processes. These are (1) second harmonic generation, (2) nondegenerate four-wave mixing, (3) phase conjugation, and (4) Raman scattering. Here, we show that stimulated Brillouin scattering can also be enhanced by surface mediated effects. In particular, since the amplitude of the electric field outside a microparticle is enhanced by resonant surface plasmon effects the laser-induced electrostrictive forces which give rise to stimulated Brillouin scattering in a liquid will be increased in the vicinity of the microparticle. Thus, if an appropriate liquid media such as CS2 is seeded with metallic microparticles, the Brillouin gain coefficient can be measurably enhanced if the laser fields are resonant with the microparticle surface plasmon mode.
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Garmaeva, E. V. "Parametric basis stimulated Brillouin scattering". In Modern Problems of Telecommunications - 2024. Siberian State University of Telecommunications and Information Systems, 2024. http://dx.doi.org/10.55648/spt-2024-1-378.

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This report describes parametric amplification using stimulated Brillouin scattering. Brillouin amplification allows for amplification of shorter wavelengths with lower pumping intensity than combination amplification. Analytical forecasts, numerical solutions of the three-wave coupling equations, and "particle-in-a-cell" modeling suggest that Brillouin amplification in a solid-density plasma will compress the current laser pulses.
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Schroeder, John, L. G. Hwa, M. D. Chyong e D. A. Thompson. "Brillouin scattering spectra for oxide and halide glasses: intrinsic Brillouin linewidths and stimulated Brillouin gain". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.wy4.

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Brillouin scattering measurements on various multicomponent halide and oxide glass compositions were done as a function of composition, lattice temperature, and configurational temperature. The intrinsic Brillouin linewidth measurements, Brillouin intensities, and Brillouin frequency shifts allowed the calculation of phonon attenuations, the Pockels elastooptic coefficients, and the stimulated Brillouin scattering gain coefficients. From the parameters obtained in the above measurements we are able to calculate the threshold energy for the onset of stimulated Brillouin scattering in halide and oxide glasses. Results show that the threshold power for stimulated Brillouin scattering is larger in some of the halide glass compositions than some of the silica-based glasses. This finding has important ramifications as a selection criteria for halide-based glasses vs oxide based glasses in their use as possible single-mode waveguide materials. The phonon attenuation values of some of the halide glasses, as measured from the linewidth data, had magnitudes that correspond more to a liquid than a solid. These anomalous phonon attenuation findings are discussed in light of existing theories.
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Florez, Omar, Paulo F. Jarschel, Claudia M. Serpa, Cristiano M. B. Cordeiro e Paulo Dainese. "Brillouin scattering in silica microwires". In Latin America Optics and Photonics Conference. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/laop.2014.lth2a.3.

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Montagna, Maurizio, Sabina Ronchin, Flavio Rossi, Cristiana Tosello, Enrico Moser, Maurizio Ferrari e Giancarlo C. Righini. "Waveguided Raman and Brillouin scattering". In Symposium on Integrated Optoelectronics, a cura di Shibin Jiang. SPIE, 2000. http://dx.doi.org/10.1117/12.382849.

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Rapporti di organizzazioni sul tema "Brillouin scattering"

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Grimsditch, M. Surface brillouin scattering from graphite. Office of Scientific and Technical Information (OSTI), ottobre 1992. http://dx.doi.org/10.2172/74163.

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Grimsditch, M., S. Kumar e R. S. Goldman. A Brillouin scattering investigation of NiO. Office of Scientific and Technical Information (OSTI), giugno 1992. http://dx.doi.org/10.2172/10186757.

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Zmuda, Michael W. Stimulated Brillouin Scattering (SBS) Suppression Techniques. Fort Belvoir, VA: Defense Technical Information Center, luglio 2007. http://dx.doi.org/10.21236/ada473393.

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Yu, Chung. Stimulated Brillouin Scattering Switching in Mid Fibers. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1992. http://dx.doi.org/10.21236/ada260456.

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Patton, Carl E., e Gopalan Srinivasan. Magnetostatic Wave Device Characterization by Brillouin Light Scattering. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1989. http://dx.doi.org/10.21236/ada213798.

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Patton, Carl E. A Brillouin Light Scattering Study of Magnetic Excitations. Fort Belvoir, VA: Defense Technical Information Center, gennaio 1986. http://dx.doi.org/10.21236/ada164716.

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Falk, Joel, e Morton Kanefsky. Phase Conjugation and Beam Combination Using Stimulated Brillouin Scattering. Fort Belvoir, VA: Defense Technical Information Center, luglio 1993. http://dx.doi.org/10.21236/ada269899.

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Umstadter, D., W. B. Mori e C. Joshi. The coupling of stimulated Raman and Brillouin scattering in a plasma. Office of Scientific and Technical Information (OSTI), settembre 1988. http://dx.doi.org/10.2172/5468785.

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Froula, Dustin Henry. Experimental Studies of the Stimulated Brillouin Scattering Instability in the Saturated Regime. Office of Scientific and Technical Information (OSTI), ottobre 2002. http://dx.doi.org/10.2172/15002258.

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Falco, Charles M., e David J. Keavney. In Situ High Sensitivity Brillouin Light Scattering Spectrometer for MBE-Grown Thin Films. Fort Belvoir, VA: Defense Technical Information Center, agosto 2001. http://dx.doi.org/10.21236/ada388738.

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