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: In this article, a high-performance Brillouin optical time-domain analysis (BOTDA) system with an extended sensing range by combining frequency-division multiplexing and in-line Erbium doped fiber amplifiers (EDFAs) was demonstrated.
Abstract: We demonstrate a high-performance Brillouin optical time-domain analysis (BOTDA) system with an extended sensing range by combining frequency-division multiplexing and in-line Erbium doped fiber amplifiers (EDFAs). The frequency-division multiplexing BOTDA features multiple sections of fibers with different Brillouin frequency shifts, and it reduces the effective Brillouin interaction length to one resonant Brillouin frequency section rather than the entire length of the sensing fiber, so that the power of CW probe of BOTDA can be increased to enhance the Brillouin signal within individual sections and consequently extend the sensing range combined with high strain or temperature resolution with negligible pump depletion. In addition, in-line EDFAs placed between spans are used to compensate the fiber loss for similar Brillouin gains in each span. In experiment, a 150-km sensing range is achieved by dividing the sensing fibers into two spans of equal length and using two types of fibers in each span. Using the differential pulse-width pair technique, a 100/120 ns pulse pair is used to realize a 2-m spatial resolution and a measurement accuracy of 1.5°C/30 μe at the end of the sensing fibers.
106 citations
TL;DR: Two hypersonic phononic gaps of different nature in three-dimensional colloidal films of nanospheres using Brillouin light scattering are observed, originating from the interaction of the band of quadrupole particle eigenmodes with the acoustic effective-medium band and the hybridization gap is robust.
Abstract: We report on the observation of two hypersonic phononic gaps of different nature in three-dimensional colloidal films of nanospheres using Brillouin light scattering One is a Bragg gap occurring at the edge of the first Brillouin zone along a high-symmetry crystal direction The other is a hybridization gap in crystalline and amorphous films, originating from the interaction of the band of quadrupole particle eigenmodes with the acoustic effective-medium band, and its frequency position compares well with the computed lowest eigenfrequency Structural disorder eliminates the Bragg gap, while the hybridization gap is robust
106 citations
TL;DR: A 170 W all-fiber linearly-polarized single-frequency sing-mode ytterbium amplifier at 1064 nm with an optical efficiency of 80% is demonstrated and 7 times increase of the stimulated Brillouin scattering threshold is achieved.
Abstract: A 170 W all-fiber linearly-polarized single-frequency sing-mode ytterbium amplifier at 1064 nm with an optical efficiency of 80% is demonstrated. 3.9 m long ytterbium-doped polarization maintaining fiber with a core diameter of 10 μm is used as the gain fiber, which guarantees a diffraction-limited output with a measured M(2) of 1.02. To suppress the stimulated Brillouin scattering, longitudinally varied strains are applied on the gain fiber according to the signal power evolution and the temperature distribution. 7 times increase of the stimulated Brillouin scattering threshold is achieved.
104 citations
TL;DR: In this article, the acoustic normal modes were derived and numerically evaluated for a cylindrical step-index fiber with both an infinite and a finite cladding, and it was found that the phonon population which contributes to the Brillouin backscattering spectrum is both narrower in range and shifted in frequency when compared to the corresponding case in the bulk medium.
Abstract: Brillouin scattering in single-mode optical fibers has been investigated both theoretically and experimentally for a 180\ifmmode^\circ\else\textdegree\fi{} scattering geometry and experimentally for a 90\ifmmode^\circ\else\textdegree\fi{} scattering angle. The acoustic normal modes were derived and numerically evaluated for a cylindrical step-index fiber with both an infinite and a finite cladding. It was found that the phonon population which contributes to the Brillouin back-scattering spectrum is both narrower in range and shifted in frequency when compared to the corresponding case in the bulk medium. Back-scattering experiments were performed which yielded the intrinsic phonon lifetime for the longitudinally polarized excitations which are responsible for stimulated Brillouin scattering in the core of a 1.5-\ensuremath{\mu}m (radius) fiber. Brillouin spectra were also observed at a scattering angle of 90\ifmmode^\circ\else\textdegree\fi{}, and the widths of the spectral components were interpreted in terms of nonconservation of wave vector along the radial direction in the acousto-optic interaction. The consequences of these results to stimulated Brillouin scattering in optical fibers are discussed.
104 citations
TL;DR: Stimulated Brillouin scattering of intense laser light with build-up of coherent hypersonic waves in liquids was studied in this article, where the authors showed that it is possible to construct a coherent coherent HWA in liquids.
Abstract: Stimulated Brillouin scattering of intense laser light with build-up of coherent hypersonic waves in liquids
104 citations