Topic
Brillouin scattering
About: Brillouin scattering is a research topic. Over the lifetime, 11426 publications have been published within this topic receiving 178306 citations.
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TL;DR: A novel technique that enables coherent detection of spontaneous Brillouin scattering in radio-frequency region has been demonstrated for distributed measurements of temperature and strain in long fiber by using a CW single-frequency BrillouIn fiber laser.
Abstract: A novel technique that enables coherent detection of spontaneous Brillouin scattering in the radio-frequency (<500 MHz) region with excellent long-term stability has been demonstrated for distributed measurements of temperature and strain in long fiber. An actively stabilized single-frequency Brillouin fiber laser with extremely low phase noise and intensity noise is used as a well-defined, frequency-shifted local oscillator for the heterodyne detection, yielding measurements of spontaneous Brillouin scattering with high frequency stability. Based on this approach, a highly stable real-time fiber sensor for distributed measurements of both temperature and strain over long fiber has been developed utilizing advanced digital signal processing techniques.
57 citations
TL;DR: In this article, the authors derived the relation between a figure of merit, M1, for the diffraction efficiency of acousto-optical devices and the Brillouin gain coefficient, gB, and estimated the values of gB and the phonon lifetime for typical As2S3 and As2Se3 chalcogenide glasses.
Abstract: We derived the relation between a figure of merit, M1, for the diffraction efficiency of acousto-optical devices and the Brillouin-gain coefficient, gB We then estimated the values of gB and the phonon lifetime for typical As2S3 and As2Se3 chalcogenide glasses from known acousto-optical parameters We found that the magnitude of gB for these two glasses is greater than 20 times that of fused silica
57 citations
TL;DR: In this article, the angular dispersion of surface acoustic phonons propagating on {100, {110, and {111} oriented planes of nickel single crystals has been measured by Brillouin scattering and continuous wave scanning acoustic microscope.
Abstract: The directional dependence (angular dispersion) of surface acoustic phonons propagating on {100}, {110}, and {111} oriented planes of nickel single crystals has been measured by Brillouin scattering and continuous wave scanning acoustic microscope. All the elastic constants C11, C12, C44 are obtained from the angular dispersion of each plane separately. These are compared with the elastic constants determined with conventional ultrasonic measurements on the same specimens. The difference in the sampling depth or the approximate depth of propagation of the acoustic waves into the specimen in each technique is used to characterize the extent of the polish‐induced damage zone in the sample.
57 citations
TL;DR: In this article, the solutions of stimulated Brillouin scattering (SBS) equations in single mode fibres are reported, and how the results can be used to enable easy and flexible evaluation of the power budget requirements in optical fiber transmission systems.
Abstract: The solutions of stimulated Brillouin scattering (SBS) equations in single mode fibres are reported, and it is shown how the results can be used to enable easy and flexible evaluation of the power budget requirements in optical fibre transmission systems.
57 citations
TL;DR: The main conclusion of this study is that the measurements in gain configuration are more robust to this non-local effect than the loss configuration, which is of particular interest for manufacturers of long-range BOTDA systems.
Abstract: According to recent models, non-local effects in dual-probe-sideband Brillouin Optical Time Domain Analysis (BOTDA) systems should be essentially negligible whenever the probe power is below the Stimulated Brillouin Scattering (SBS) threshold. This paper shows that actually there appear non-local effects in this type of systems before the SBS threshold. To explain these effects it is necessary to take into account a full spectral description of the SBS process. The pump pulse experiences a frequency-dependent spectral deformation that affects the readout process differently in the gain and loss configurations. This paper provides a simple analytical model of this phenomenon, which is validated against compelling experimental data, showing good agreement. The main conclusion of our study is that the measurements in gain configuration are more robust to this non-local effect than the loss configuration. Experimental and theoretical results show that, for a total probe wave power of ~1 mW (500 μW on each sideband), there is an up-shifting of ~1 MHz in the Brillouin Frequency Shift (BFS) retrieved from the Brillouin Loss Spectrum, whereas the BFS extracted from the measured Brillouin Gain Spectrum is up-shifted only ~0.6 MHz. These results are of particular interest for manufacturers of long-range BOTDA systems.
56 citations