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Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "BRILLOUIN GAIN"

1

Feng, Liuyan, Yi Liu, Wenjun He, Yajun You, Linyi Wang, Xin Xu, and Xiujian Chou. "Intramode Brillouin Scattering Properties of Single-Crystal Lithium Niobate Optical Fiber." Applied Sciences 12, no. 13 (June 26, 2022): 6476. http://dx.doi.org/10.3390/app12136476.

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Анотація:
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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2

She, C. Y., G. C. Herring, H. Moosmüller, and S. A. Lee. "Stimulated Rayleigh-Brillouin gain spectroscopy." Physical Review A 31, no. 6 (June 1, 1985): 3733–40. http://dx.doi.org/10.1103/physreva.31.3733.

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3

Dragic, Peter D. "Brillouin Gain Reduction Via B." Journal of Lightwave Technology 29, no. 7 (April 2011): 967–73. http://dx.doi.org/10.1109/jlt.2011.2107502.

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Hang Yuan, Hang Yuan, Yulei Wang Yulei Wang, Zhiwei Lu Zhiwei Lu, Rui Liu Rui Liu, and and Can Cui and Can Cui. "Measurement of Brillouin gain coefficient in fluorocarbon liquid." Chinese Optics Letters 14, no. 4 (2016): 041902–41905. http://dx.doi.org/10.3788/col201614.041902.

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5

Djadaojee, Lionel, Albane Douillet та Jules Grucker. "Stimulated Brillouin gain spectroscopy in a confined spatio-temporal domain (30 μm, 170 ns)". European Physical Journal Applied Physics 89, № 3 (березень 2020): 30701. http://dx.doi.org/10.1051/epjap/2020200012.

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Анотація:
The Brillouin gain spectrum of a test sample (liquid acetone at room temperature) on scales simultaneously confined in space (~30 μm) and time (~170 ns) is reported. This is done using a pulsed stimulated Brillouin scattering gain spectrometer in a θ ≈ 90° crossing beam configuration. After having identified and corrected for different sources of background signals, we obtained a Brillouin gain spectrum allowing an accurate measurement (MHz range) of the Brillouin frequency (few GHz). This is of interest for probing acoustic properties of transparent media subjected to repetitive fast transient phenomena on small length scales.
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6

Ajiya, M., J. A. Oladapo, and N. A. M. Ahmad Hambali. "Lasing threshold characteristics of multi-wavelength Brillouin–erbium laser in the L-band region assisted by delay interferometer." Journal of Nonlinear Optical Physics & Materials 25, no. 02 (June 2016): 1650024. http://dx.doi.org/10.1142/s0218863516500247.

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Анотація:
This paper reports the simulation of L-band multi-wavelength Brillouin–erbium fiber laser that utilizes delay interferometer as a comb filter. The simulation is performed using OptiSystem. The structure exhibits threshold power in terms of Erbium doped fiber amplifier (EDFA) gain of 10[Formula: see text]mW at a very low Brillouin pump power of 0.00316[Formula: see text]mW for the generation of first Stokes. Thirty one output channels were produced with minimum EDFA gain of 1[Formula: see text]W at Brillouin pump power of 0.00316[Formula: see text]mW. In line with theory, it has been observed that higher Brillouin pump power requires low threshold gain and vice versa to generate the Brillouin Stokes.
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7

Lin, Wenqiao, Zhisheng Yang, Xiaobin Hong, Sheng Wang, and Jian Wu. "Brillouin gain bandwidth reduction in Brillouin optical time domain analyzers." Optics Express 25, no. 7 (March 24, 2017): 7604. http://dx.doi.org/10.1364/oe.25.007604.

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8

Zhan, Yage, Ziyang Shen, Zeyu Sun, Qiao Yu, Hong Liu, and Yong Kong. "A two-parameter distributed sensing system for temperature and strain monitoring based on highly nonlinear fiber." Sensor Review 39, no. 1 (January 21, 2019): 10–16. http://dx.doi.org/10.1108/sr-10-2017-0230.

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Анотація:
Purpose The purpose of this paper is to theoretically analyze and experimentally demonstrate the investigation of and present a kind of sensing system for monitoring simultaneous temperature and strain measurements based on highly nonlinear fiber (HNLF) and single mode fiber (SMF). Design/methodology/approach First, the stimulated Brillouin scattering (SBS) characteristics of the HNLF have been studied, including the Brillouin gain bandwidth, Brillouin gain center frequency and SBS threshold. Second, based on the Brillouin gain center frequency, the Brillouin frequency shift coefficients of strain and temperature in HNLF have been studied. Third, the sensing and signal interrogation scheme for simultaneous monitoring of temperature and strain with high resolution has been presented. Findings It is found that the HNLF has a wider Brillouin gain bandwidth. The SBS threshold of HNLF is 78 mW, which is much larger than 7.9 mW of SMF. Also, the Brillouin frequency shift coefficients of strain and temperature in HNLF are 0.0308 and 0.413 MHz/°C, respectively. Originality/value The larger threshold of SBS is useful to avoid SBS under certain situations that Spontaneous Brillouin Scattering is necessary and should be applied. The technique is based on the fact that the Brillouin frequency shift coefficients of strain and temperature in HNLF are different from those in SMF. Therefore, the two-parameter monitoring can be achieved by producing SBS and obtaining the back-scattering Brillouin signal light simultaneously in HNLF and SMF.
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Li, Bo, Ningjun Jiang, and Xiaole Han. "Denoising of BOTDR Dynamic Strain Measurement Using Convolutional Neural Networks." Sensors 23, no. 4 (February 4, 2023): 1764. http://dx.doi.org/10.3390/s23041764.

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Анотація:
The Brillouin optical time domain reflectometry (BOTDR) system measures the distributed strain and temperature information along the optic fibre by detecting the Brillouin gain spectra (BGS) and finding the Brillouin frequency shift profiles. By introducing small gain stimulated Brillouin scattering (SBS), dynamic measurement using BOTDR can be realized, but the performance is limited due to the noise of the detected information. An image denoising method using the convolutional neural network (CNN) is applied to the derived Brillouin gain spectrum images to enhance the performance of the Brillouin frequency shift detection and the strain vibration measurement of the BOTDR system. By reducing the noise of the BGS images along the length of the fibre under test with different network depths and epoch numbers, smaller frequency uncertainties are obtained, and the sine-fitting R-squared values of the detected strain vibration profiles are also higher. The Brillouin frequency uncertainty is improved by 24% and the sine-fitting R-squared value of the obtained strain vibration profile is enhanced to 0.739, with eight layers of total depth and 200 epochs.
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10

Awsaj, Mohammed K., Thamer Fahad Al-Mashhadani, Mohammed Kamil Salh Al-Mashhadani, Rabi Noori Hammudi, Ali yaseen Ali, Mohad Saiful Dzulkefly Zan, and Norhana Arsad. "Tunable 60 GHz Multiwavelength Brillouin Erbium Fiber Laser." Applied Sciences 13, no. 5 (March 3, 2023): 3275. http://dx.doi.org/10.3390/app13053275.

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Анотація:
An experimental study of a tunable 60 GHz multiwavelength Brillouin erbium fiber laser is presented in this paper. Two unidirectional ring laser cavities and two pre-amplification laser cavities are used. In the first three cavities, a Brillouin gain medium is presented with a dispersion compensation fiber (DCF) spool, and a single-mode fiber (SMF) spool is used as a Brillouin gain medium in the fourth cavity. Three erbium amplifiers are utilized to supply enough gain to the generated Brillouin Stokes signal and to suppress cavity losses. For these three amplifiers, up to 450 mW (150 mW for each) of a 1480 nm pump power is used. In our proposed configuration, four sextuple Brillouin Stokes signals with a high power of 10 dBm and more than 55 dB as an optical signal-to-noise ratio are achieved. The obtained Brillouin Stokes signals can be tuned over 30 nm (1560–1590 nm) and can be easily used in dense wavelength division multiplexing in optics communication systems.
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Більше джерел

Дисертації з теми "BRILLOUIN GAIN"

1

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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2

Aryanfar, Iman. "Tailoring the phase and amplitude of optical signals using large Brillouin gain in photonic integrated circuits." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/17748.

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Анотація:
Microwave photonic devices based on stimulated Brillouin scattering offer unique functionalities evidenced by recent demonstrations of broadband tunable microwave filters with the potential for developing flexible and compact solutions. So far the results presented have been limited by the relatively modest Brillouin gain, which limits the flexibility and functionality of these filters. In this thesis, I leverage the recent advances in optical chip fabrication, which have produced giant on-chip SBS gain as the basis of enhanced functionalities. In particular, by combining phase and amplitude tailoring advanced integrated microwave signal processing such as on-chip optical isolation, separate carrier tuning, broad true time delay, and reconfigurable band-pass and band-stop filter are demonstrated.
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3

Al-Taiy, Hassanain Majeed [Verfasser], and Thomas [Akademischer Betreuer] Schneider. "Investigation of the Stimulated Brillouin Scattering (SBS) Gain Enhancement in Silicon Nano-Waveguides and Applications / Hassanain Majeed Al-Taiy ; Betreuer: Thomas Schneider." Braunschweig : Technische Universität Braunschweig, 2017. http://d-nb.info/1175817775/34.

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4

Mallek-Bouras, Djouher. "Etude de l'effet Brillouin en cavité laser." Angers, 2011. http://www.theses.fr/2011ANGE0008.

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Анотація:
Cette étude va servir à comprendre la source des instabilités observées expérimentalement dans les lasers à fibre de puissance. La première partie de ce travail est consacrée a la mise en oeuvre d'un modèle cinétique qui décrit l'évolution spatio-temporelle de l'intensité d'un laser de puissance à fibre dopée ytterbium en présence de la DBS. La cavité de ce laser est de type Fabry Pérot. Elle est constituée de deux miroirs ce qui conduit à l'existence de deux ondes laser (aller-retour) qui se propagent en sens contraire, ainsi que de deux ondes Stokes associées aux ondes laser. La présence de toutes ces ondes sous la courbe de gain nécessite la prise en compte de la saturation croisée entre les ondes laser et les ondes Stokes. Le résultat original le plus important de cette étude est qu'en présence de la diffusion Brillouin stimulée, le laser à fibre de puissance dopée ytterbium présente un fonctionnement auto-impulsionnel dans le cas d'une cavité à forte pertes sans aucun absorbant saturable. Pour le cas d'une bonne cavité où cavité à faibles pertes la dynamique présente un fonctionnement continu quel que soit le taux de pompage, ce qui est conforme aux observations expérimentales. Dans Ia deuxième partie nous avons étudié numériquement l'influence de la diffusion BriIlouin dans une cavité laser à faibles pertes, en utilisant le modèle des amplitudes couplées et en tenant compte de la dynamique de l'onde acoustique. Des fonctionnements dynamiques riches et complexes sont observés
This study serves to understand the origin of the instabilities observed experimentally in the high power double cladding fiber lasers. The irnplementation of a kinetic model which describes the spatiotemporal evolution of the intensity of a high power fiber laser in the presence of the scattering Brillouin was studied in the first part. The Fabry-Perot laser cavity was considered. It is established by two rnirrors what drives to the existence of two laser waves which propagate in opposite sense, as well as of two Stokes waves associated with the waves lasers. The presence of al1 these waves under the curve of gain requires the consideration of the saturation crossed between the waves laser and the waves Stokes. The most important original result of this study is that in the presence of the stimulated scattering Brillouin, the ytterbium doped fiber laser presents an auto-impulsive functioning in the case of a cavity to strong losses without any absorbent saturable. For the case of cavity with low losses the dynamics presents a continuous functioning whatever the rate of pumping. The f i e n c e of the stimulated scattering Brillouin in a laser cavity with low losses was studied numerically in the second part, by using the model of the coupled amplitudes and by taking into account the dynamics of the acoustic wave. Rich and complex dynamic are observed
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5

Mallek, Djouher. "ETUDE DE L'EFFET BRILLOUIN EN CAVITE LASER." Phd thesis, Université d'Angers, 2011. http://tel.archives-ouvertes.fr/tel-00662516.

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Анотація:
Cette étude va servir à comprendre la source des instabilités observées expérimentalement dans les lasers à fibre de puissance. La première partie de ce travail est consacrée a la mise en oeuvre d'un modèle cinétique qui décrit l'évolution spatio-temporelle de l'intensité d'un laser de puissance à fibre dopée ytterbium en présence de la DBS. La cavité de ce laser est de type Fabry Pérot. Elle est constituée de deux miroirs ce qui conduit à l'existence de deux ondes laser (aller-retour) qui se propagent en sens contraire, ainsi que de deux ondes Stokes associées aux ondes laser. La présence de toutes ces ondes sous la courbe de gain nécessite la prise en compte de la saturation croisée entre les ondes laser et les ondes Stokes. Le résultat original le plus important de cette étude est qu'en présence de la diffusion Brillouin stimulée, le laser à fibre de puissance dopée ytterbium présente un fonctionnement auto-impulsionnel dans le cas d'une cavité à forte pertes sans aucun absorbant saturable. Pour le cas d'une bonne cavité où cavité à faibles pertes la dynamique présente un fonctionnement continu quel que soit le taux de pompage, ce qui est conforme aux observations expérimentales. Dans Ia deuxième partie nous avons étudié numériquement l'influence de la diffusion BriIlouin dans une cavité laser à faibles pertes, en utilisant le modèle des amplitudes couplées et en tenant compte de la dynamique de l'onde acoustique. Des fonctionnements dynamiques riches et complexes sont observés.
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6

Bordais, Sylvain. "Etude des amplificateurs et lasers 1 um de forte puissance à base de fibre double gaine dopée ytterbium." Rennes 1, 2002. https://tel.archives-ouvertes.fr/tel-00002890.

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Анотація:
Cette thèse présente les travaux effectués pour développer et optimiser des amplificateurs et lasers 1 æm de forte puissance à base de fibre double gaine dopée Ytterbium. Nous commençons par étudier les propriétés spectroscopiques de l'ion Ytterbium puis les moyens et résultats de caractérisation des fibres. Nous discutons de certaines spécificités associées aux fibres double gaine, comme le mélange de mode. Enfin, nous faisons l'étude comparative des principales techniques d'injection de la pompe. Nous présentons ensuite le modèle numérique de l'amplificateur. Nous donnons les résultats expérimentaux permettant de le valider et étudions, l'influence des paramètres intrinsèques et extrinsèques à la fibre dans le cas de structures à simple et double étage. Nous mettons l'accent sur les effets limitatifs du Brillouin généré. Nous étendons ensuite le modèle développé au cas du laser à gain homogène. Nous étudions plus en détail le laser multimode à 1083 nm pour le pompage optique de l'hélium. Nous étudions l'effet de divers paramètres sur la largeur d'enveloppe mesurée. Nous abordons, enfin, l'étude des instabilités observées et l'analyse de leurs origines.
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7

Bordais, Sylvain. "Etude des amplificateurs et lasers 1 µm de forte puissance à base de fibre double gaine dopée Ytterbium." Phd thesis, Université Rennes 1, 2002. http://tel.archives-ouvertes.fr/tel-00002890.

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Анотація:
Cette thèse présente les travaux effectués pour développer et optimiser des amplificateurs et lasers 1 µm de forte puissance à base de fibre double gaine dopée Ytterbium. Le premier chapitre traite de la caractérisation passive de la fibre. Nous donnons les caractéristiques spectroscopiques de l'ion Ytterbium dans une matrice de silice. Nous présentons ensuite les moyens et résultats de caractérisation des fibres utilisées. Nous discutons ensuite certaines spécificités associées aux fibres double gaine, comme le mélange de mode. Enfin, nous faisons l'étude comparative des principales techniques d'injection de la pompe. Le second chapitre traite des amplificateurs. Nous présentons le modèle numérique de l'amplificateur dans le cas d'un régime de pompage continu et d'amplification de signaux continus. Puis, nous donnons les résultats expérimentaux permettant de le valider. Nous étudions, ensuite, l'influence des paramètres intrinsèques et extrinsèques à la fibre. Nous mettons l'accent sur les effets limitatifs du Brillouin généré. Enfin, nous présentons les paramètres permettant d'optimiser le fonctionnement des amplificateurs dans une structure simple et double étage. Le troisième chapitre traite des lasers. Nous commençons par étendre le modèle développé au cas du laser à gain homogène. Nous validons, tout d'abord, le modèle avec les résultats issus d'un laser en cavité Fabry-Pérot de 1 W, puis, nous optimisons ses paramètres. Nous présentons, ensuite, le laser multimode à 1083 nm pour le pompage optique de l'hélium. Nous étudions l'effet de divers paramètres sur la largeur d'enveloppe mesurée, et confrontons les résultats au modèle numérique. Nous abordons l'étude des instabilités observées et l'analyse de leurs origines. Nous continuons par présenter les résultats théoriques et expérimentaux d'un laser en anneau. Enfin, nous étudions un laser pour le pompage d'un résonateur Raman.
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8

Olmedo, Herrero Elena. "Étude des effets non linéaires dans les lasers et amplificateurs de puissance à fibre double gaine dopée Er3+/Yb3+." Phd thesis, Télécom ParisTech, 2003. http://pastel.archives-ouvertes.fr/pastel-00000743.

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Анотація:
Depuis quelques années, nous assistons à une augmentation soutenue de la demande en puissance des sources optiques. L'introduction des fibres à double gaine dopées Er3+/Yb3+ dans la conception des lasers et des amplificateurs a permis l'obtention de puissances très élevées, impossibles à imaginer quelques années auparavant. L'évolution de cette technologie, conçue en principe pour des systèmes télécom, permet d'envisager de nombreuses applications dans d'autres secteurs tels que le médical, la découpe laser, le marquage, le lidar, le perçage, le soudage, ou le traitement de surface, entre autres. Du fait des fortes puissances mises en jeu dans de tels composants, l'apparition des effets non linéaires devient incontournable. Les effets non linéaires sont à l'origine d'interférences ou de distorsions qui dégradent considérablement les signaux. La compréhension de ces effets devient donc indispensable dans l'optique de trouver des règles d'ingénierie aidant à les minimiser lors de la conception de nouveaux composants. Ce mémoire présente une contribution, à la fois théorique et expérimentale, à l'étude des effets non linéaires dans les lasers et amplificateurs de puissance à fibre double gaine dopée Er3+/Yb3+, portant plus particulièrement sur l'automodulation de phase et la diffusion Brillouin stimulée. L'automodulation de phase a été traitée dans le cas des impulsions d'une durée inférieure à 4 ps. Après une mise en évidence expérimentale, un outil de simulation a été créé à l'aide de l'équation de Schrödinger non linéaire avec gain. Afin d'obtenir des impulsions de puissance supérieure à celle imposée par l'automodulation de phase, un système d'amplification d'impulsions utilisant l'architecture CPA ('Chirped Pulse Amplification') a été mis en place, permettant l'obtention d'impulsions de 450 fs avec une puissance crête supérieure à 35 kW. Dans le cas des impulsions larges -d'une durée supérieure à 10 ns-, la puissance maximum de sortie est limitée par un autre effet: la diffusion Brillouin stimulée. Cet effet a également été mis en évidence de façon expérimentale, puis modélisé à l'aide d'un système de cinq équations couplées. Comme dans le cas de l'automodulation de phase, un outil de simulation a aussi été créé. D'autres effets, tels que la diffusion Raman stimulée ou l'amplification paramétrique ont également été étudiés de façon expérimentale.
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9

YADAV, SANDEEP. "SBS BASED SLOW-LIGHT GENERATION IN PHOTONIC CRYSTAL FIBER." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15120.

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Анотація:
In today’s world, the demand of ultra-fast information transfer with ultra-high bandwidths has reached to an extraordinary level. Hence, the transmission in the future internet-backbone will be constrained mostly in the network nodes. Also the power consumption of the network system will increase to indefensible levels. To overcome these constraints power-efficient photonic networks which can provide ultra-fast all-optical switching and routing are necessary. Optical buffering is required for such ultra-fast networks to avoid congestion. Slow-light effect has been investigated as one of the solution of optical buffering. It means slowing down the group velocity of light pulses in a medium. To realize this, many different methods and materials have been developed but due to its significant advantages the nonlinear effect of stimulated Brillouin scattering (SBS) is particularly promising. In this thesis, two different designs of photonic crystal fibers have been proposed for slow-light analysis. The first design is of rectangular core nature with inner air holes having more radius as compared to rest of the air holes. The material used for that design is Tellurite for 100 m long photonic crystal fiber. Another design has been designed with graded index feature i.e. the radius of the air holes keeps on increasing in a regular pattern. The analysis in this fiber has been done for 1 m long photonic crystal fiber with As2Se3 chalcogenide as material of the photonic crystal fiber. Fundamental properties such as confinement loss and effective mode area for both the designs have been simulated. Using those parameters, a maximum time-delay of 154.3 ns has been reported for the first design having tellurite material. The power requirement found to be 26 mW to achieve such high time delay for the length of 100 m long photonic crystal fiber. A Brillouin Gain of 19.07 dB has been reported for that design. For the second design having chalcogenide material, maximum time-delay of 252.8 ns has been reported for 1 m long photonic crystal fiber for a small input pump power of 9.8 mW. The Brillouin Gain achieved for this design was also more as compared to the first design i.e. 99.78 dB. Both the designs were thus compared for slow-light using SBS effect.
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10

Zhen, Yurong. "Plasmonic properties and applications of metallic nanostructures." Thesis, 2013. http://hdl.handle.net/1911/72071.

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Анотація:
Plasmonic properties and the related novel applications are studied on various types of metallic nano-structures in one, two, or three dimensions. For 1D nanostructure, the motion of free electrons in a metal-film with nanoscale thickness is confined in its normal dimension and free in the other two. Describing the free-electron motion at metal-dielectric surfaces, surface plasmon polariton (SPP) is an elementary excitation of such motions and is well known. When further perforated with periodic array of holes, periodicity will introduce degeneracy, incur energy-level splitting, and facilitate the coupling between free-space photon and SPP. We applied this concept to achieve a plasmonic perfect absorber. The experimentally observed reflection dip splitting is qualitatively explained by a perturbation theory based on the above concept. If confined in 2D, the nanostructures become nanowires that intrigue a broad range of research interests. We performed various studies on the resonance and propagation of metal nanowires with different materials, cross-sectional shapes and form factors, in passive or active medium, in support of corresponding experimental works. Finite- Difference Time-Domain (FDTD) simulations show that simulated results agrees well with experiments and makes fundamental mode analysis possible. Confined in 3D, the electron motions in a single metal nanoparticle (NP) leads to localized surface plasmon resonance (LSPR) that enables another novel and important application: plasmon-heating. By exciting the LSPR of a gold particle embedded in liquid, the excited plasmon will decay into heat in the particle and will heat up the surrounding liquid eventually. With sufficient exciting optical intensity, the heat transfer from NP to liquid will undergo an explosive process and make a vapor envelop: nanobubble. We characterized the size, pressure and temperature of the nanobubble by a simple model relying on Mie calculations and continuous medium assumption. A novel effective medium method is also developed to replace the role of Mie calculations. The characterized temperature is in excellent agreement with that by Raman scattering. If fabricated in an ordered cluster, NPs exhibit double-resonance features and the double Fano-resonant structure is demonstrated to most enhance the four-wave mixing efficiency.
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Частини книг з теми "BRILLOUIN GAIN"

1

She, C. Y., H. Moosmüller, G. C. Herring, S. Y. Tang, and S. A. Lee. "Rayleigh-Brillouin Gain Spectroscopy in Gases." In Springer Series in Optical Sciences, 227–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-540-39664-2_69.

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2

Faris, Gregory W. "Brillouin Gain Spectroscopy in Glasses and Crystals." In Applied Laser Spectroscopy, 307–12. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-1342-7_25.

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3

Friedman, J. S., B. L. Bracewell, H. D. Hochheimer, and C. Y. She. "Stimulated Brillouin Gain Spectroscopy at High Pressures." In NATO ASI Series, 209–15. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-2480-3_18.

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4

Ferreira, Mário F. "Stimulated Brillouin Scattering in Optical Fibers with Distributed Gain." In Applications of Photonic Technology, 49–52. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-9247-8_9.

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5

He, Guang S. "Stimulated Brillouin Scattering." In Laser Stimulated Scattering and Multiphoton Excitation, 144–80. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780192895615.003.0005.

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Анотація:
Stimulated Brillouin scattering (SBS) is based on a gain mechanism provided by the pump light reflection from the induced hypersonic acoustic Bragg grating in a continuous net optical medium. The mathematic formulation of SBS generation is based on the solutions of the coupled wave equations that describe the pump field-induced hypersonic acoustic field and the reaction of the acoustic field to the optical field. In experiments, SBS is generally generated along the backward direction, with a longest gain length and a maximum frequency shift that is determined by the speed of the forward hypersonic acoustic wave. SBS generation requires a narrower pump spectral linewidth and start-delay due to the inertia of the collective acoustic motion of scattering molecules.
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6

Kenyon, Ian R. "Phonons." In Quantum 20/20, 55–74. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198808350.003.0004.

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Phonons are introduced as an example of quasi-particles that can only exist in matter. Debye’s quantum model for heat capacity of solids and comparison with experimentin different temperature ranges is presented. The dispersion relations of lattice vibration (phonons) and quantization for chains of atoms presented, revealing the optical and acoustic modes; anharmonic effects are discussed. Crystal lattice structures and Brillouin zones are introduced. Phonon scattering and the Umklapp process described. The variation of the thermal conductivity of dielectrics with temperature is interpreted. X-ray scattering studies of phonon dispersion relations are described. Coupling between phonons with photons in polaritons is explained: Raman scattering studies of GaN used to exhibit the cross-over of their dispersion relations. The Mössbauer effect, a recoilless process, and its dependence on temperature are explained.
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Тези доповідей конференцій з теми "BRILLOUIN GAIN"

1

Sebastian, A., S. Trebaol, and P. Besnard. "Intracavity Brillouin Gain Characterization." In 2018 International Topical Meeting on Microwave Photonics (MWP). IEEE, 2018. http://dx.doi.org/10.1109/mwp.2018.8552907.

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2

Grubbs, W. Tandy, and Richard A. MacPhail. "High Resolution Stimulated Brillouin Gain Spectroscopy." In High Resolution Spectroscopy. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/hrs.1993.ma3.

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Brillouin spectroscopy has been an important source of information about the collective dynamics of molecules in liquids.1,2 In a conventional Brillouin experiment, a Fabry-Perot interferometer is used to measure the spectrum of laser light scattered at an angle θ by spontaneous density fluctuations in a sample. The Brillouin peaks in the spectrum arise from the acoustic wave component of these density fluctuations, and accordingly the shift of the Brillouin peaks from the elastic Rayleigh scattering peak corresponds to the acoustic frequency, while the width of the Brillouin peaks corresponds to the acoustic damping rate. By varying θ, and thus the scattering wavevector, one can determine the dispersion in the speed of sound and the acoustic attenuation, which in turn characterize the elastic and viscous responses of the fluid. A more detailed analysis of the spectral lineshape with the aid of generalized hydrodynamic theories allows one to determine the values of transport coefficients that describe the molecular dynamics.1
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3

Haneef, Shahna M., Deepa Venkitesh, and Balaji Srinivasan. "Depletion Characteristics of Brillouin Gain Spectrum in Fiber Brillouin Amplifiers." In Asia Communications and Photonics Conference. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/acp.2012.af4b.25.

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4

Horiguchi, Tsuneo, Mitsuhiro Tateda, Nori Shibata, and Yuji Azuma. "Polarization effects on Brillouin gain in single-mode fibers." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.fs5.

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Stimulated Brillouin scattering is one of the most important nonlinear effects in single-mode fibers. Brillouin gain depends on the polarization states of pump and Stokes fields. Stolen1 has demonstrated that the Brillouin threshold optical power in fibers is higher by a factor of 2 with scrambled polarization states than with maintained linear polarization states. However, little attention has been paid to the Brillouin gain in single-mode fibers where the polarization state is not maintained and not completely scrambled. We investigated the polarization dependence of the Brillouin gain in an ordinary single-mode fiber. The Brillouin gain measured for a 5-km single-mode fiber showed a G [1 + Kcos(2θ + ϕ)] dependence, where G is the Brillouin gain with scrambled polarization states, θ is the incident polarization direction angle of the pump or Stokes (probe) fields relative to an arbitrarily fixed azimuth in the fiber cross section, and K and ϕ are constants. The value of K reached as high as 0.31. The Brillouin gain distribution along the single-mode fiber is also presented.
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5

Dragic, Peter D., John Ballato, Stephanie Morris, and Thomas Hawkins. "Intrinsically-low Brillouin gain optical fibers." In SPIE Defense, Security, and Sensing, edited by Mark Dubinskii and Stephen G. Post. SPIE, 2013. http://dx.doi.org/10.1117/12.2018127.

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6

Bao, Xiaoyi, and Liang Chen. "Differential Gain in Distributed Brillouin Sensors." In Frontiers in Optics. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/fio.2013.fw1i.2.

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7

Schroeder, John, L. G. Hwa, M. D. Chyong, and 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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8

Sei, Daichi, Hayato Nonogaki, Kazuki Hoshino, and Yosuke Tanaka. "Noise Reduction of Brillouin Sensor Signal by using Brillouin Gain and Loss Spectra." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_at.2023.jtu2a.59.

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We evaluated the noise in slope-assisted (SA) Brillouin optical time domain analysis based on Brillouin gain and loss spectra and found out an effect that the noise is reduced compared with conventional SA methods.
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9

Lin, Wenqiao, Zhisheng Yang, Xiaobin Hong, Sheng Wang, and Jian Wu. "Narrowing Brillouin gain spectrum for BOTDA sensor." In 25th International Conference on Optical Fiber Sensors, edited by Youngjoo Chung, Wei Jin, Byoungho Lee, John Canning, Kentaro Nakamura, and Libo Yuan. SPIE, 2017. http://dx.doi.org/10.1117/12.2267646.

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10

Sebastian, Ananthu, Stephane Trebaol, and Pascal Besnard. "Brillouin Gain Characterization by Cavity Ringdown Spectroscopy." In 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2019. http://dx.doi.org/10.1109/cleoe-eqec.2019.8871652.

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Звіти організацій з теми "BRILLOUIN GAIN"

1

Faris, G. Brillouin gain spectroscopy in glasses and crystals. Office of Scientific and Technical Information (OSTI), December 1989. http://dx.doi.org/10.2172/7186188.

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2

Faris, G., L. Jusinski, M. Dyer, W. Bischel, and A. Hickman. High-resolution Brillouin gain spectroscopy in solids. Office of Scientific and Technical Information (OSTI), December 1989. http://dx.doi.org/10.2172/6964303.

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3

Fairs, G., L. Jusinski, M. Dyer, W. Bischel, and A. Hickman. Transient effects in Brillouin gain spectroscopy in solids. Office of Scientific and Technical Information (OSTI), December 1989. http://dx.doi.org/10.2172/7186185.

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4

Yu, Chung. High Gain, Low Noise and Broadband Raman and Brillouin Fiber Optic Amplifiers, Channel Selectors and Switches. Fort Belvoir, VA: Defense Technical Information Center, September 1994. http://dx.doi.org/10.21236/ada301545.

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