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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"stimulated Brillouin scattering"”.
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Stimulated Brillouin scattering in an on-chip microdisk resonator
Brillouin scattering is the scattering of light from sound waves in a medium. There are three waves involved in the process: two optical waves (pump and scattered light) and one acoustic wave, and the scattering process is restricted through the conservation of momentum and energy. Stimulated …
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STIMULATED BRILLOUIN SCATTERING SUPPRESSION VIA TEMPERATURE GRADIENTS IN FIBER AMPLIFIERS
… amplifier is explored. The limiting factor, Stimulated Brillouin Scattering (SBS), is suppressed with a single-step temperature gradient. A similar fiber amplifier to the 177W amplifier is constructed and tested at various temperatures from 90C to -120C. The Brillouin frequency is observed to …
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A study of stimulated Brillouin scattering in laser produced plasmas
… of laser-plasma instabilities, in particular stimulated Brillouin scattering (SBS), for the creation of such pulses is found to have great potential. Analysis from numerical, analytical and experimental studies are presented within this thesis which were constructed to develop a platform of …
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Distributed Pressure and Temperature Sensing Based on Stimulated Brillouin Scattering
Brillouin scattering has been verified to be an effective mechanism in temperature and strain sensing. This kind of sensors can be applied to civil structural monitoring of pipelines, railroads, and other industries for disaster prevention. This thesis first presents a novel fiber sensing scheme …
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Simulation of optical fibre communication systems influenced by stimulated brillouin scattering
… also been innovatively improved by allowing the Brillouin Shift Frequency (BS) to vary over the model fibre length, for the nonuniform fibre model (NFM) mode, or to remain constant, for the uniform fibre model (UFM) mode. The assumption of a Gaussian probability density function (pdf) for the BSF …
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Time and temperature dependence of stimulated brillouin scattering in fused silica
Several aspects of stimulated Brillouin scattering which relate to the determination of acoustic phonon lifetime (Tp) have been investigated. Fused silica was selected as the principal material to be studied because of its optical and acoustic isotropy and its availability in large, optical quality …
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Stimulated Brillouin scattering effects and suppression techniques in high power fiber amplifiers
… develops a model for numerical analysis of stimulated Brillouin scattering (SBS) effects and the development of suppression techniques for the realization of increased output power levels for high power ytterbium-doped dual clad fiber amplifiers. The overall objective of this effort is to …
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A study of stimulated Brillouin scattering and its application to phase conjugate oscillators / by Martin O'Connor.
A study of stimulated Brillouin scattering and its use for correcting phase aberrations in laser oscillators.
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The characterisation of acoustic waves in optical waveguides
… density, stress, temperature, or sound. The Stimulated Brillouin scattering (SBS) in optical waveguide is an important nonlinear effect results from the coherent interactions between optical and acoustic modes. The SBS can be considered as a primary obstacle effect in limiting the power …
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Characterisation of acoustic waves in optical waveguides
… density, stress, temperature, or sound. The Stimulated Brillouin scattering (SBS) in optical waveguide is an important nonlinear effect results from the coherent interactions between optical and acoustic modes. The SBS can be considered as a primary obstacle effect in limiting the power …
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High Power Sources Near 0.9 Micrometers in *Oxide Glass Fibers
… such as amplified spontaneous emission and stimulated Brillouin scattering are also investigated to determine the limitations to this approach.
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Novel approaches to power scaling of single-frequency photonic crystal fiber amplifiers
… to overcome these limitations. Historically, stimulated Brillouin scattering (SBS) has been the primary obstacle in the realization of high power single-frequency fiber amplifiers. A novel acoustically tailored photonic crystal fiber design, having a reduced Brillouin gain coefficient of …
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The study of acoustic properties of P205-doped silica fiber
… in several of these applications. A significant stimulated scattering mechanism observed is stimulated Brillouin scattering (SBS), resulting in strong backward scattering typically within the optical fiber core. SBS has become one of the significant factors limiting the power transmitted in an …
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High power pulse UV source development and its applications
… approach for high-energy pulse compression using stimulated Brillouin scattering. Our method achieved temporal compression of 40X in 532 nm with < 2% pulse-to-pulse fluctuation and elucidated the role of a number of overlooked parameters in the literature. We illustrated the application of the …
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Development of high power fibre amplifier components, systems and applications
… linewidth Raman amplifier mechanisms to suppress stimulated Brillouin scattering had to be employed. This amplifier system was packaged into a portable 19" rack enclosure and used to demonstrate remote, single-end, tuneable diode laser spectroscopy of methane. The packaged system detected methane …
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Investigation of single-frequency high-power Raman fiber amplifier for guide star application
… numerical model was developed that accounts for stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) in relation to the fiber mode field diameter, length, seed power, and available pump power in both co-pumped and counter-pumped configurations. The backward travelling …
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High speed optical communication systems: From modulation formats to radically new fibres
… detailed experiments to measure the effects of stimulated Brillouin scattering, self-phase modulation and four-wave mixing and compares the results to numerical models, along with capacity limit calculations. Chapter 5 investigates hollow-core photonic band-gap fibre, where such fibres are …
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Full-vectorial study of light and sound interactions in low and high index contrast silica waveguides
… planar, for this case 10% doping is used. The Stimulated Brillouin Scattering (SBS) frequency and the overlaps between the fundamental and the higher order shear and longitudinal acoustic modes and the fundamental quasi-TE optical mode are presented. Brillouin gain spectrum for this moderate …
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Nanophotonics for tailoring light-matter interaction/
… small device footprint. The third phenomenon is Stimulated Brillouin Scattering (SBS), where photon and phonon are coupled through optical forces such as electrostriction force and radiation pressure. We develop a general method of calculating SBS gain via the overlap integral between optical and …
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New techniques for multiple wavelength fiber laser generation based on edfa and tdfa
… study is related to a numerical analysis of Brillouin erbium fiber laser (BEFL). In this study, the elements of EDFA and stimulated Brillouin scattering (SBS) effect are thoroughly investigated. It is found that the optimum length of erbium doped fiber (EDF) is 10 m and the residual waves …
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