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 Brillouin optical time domain reflectometer-based distributed temperature sensor utilizing a fiber Bragg grating notch filter to suppress the Rayleigh backscatter was presented.
Abstract: We report on a Brillouin optical time domain reflectometer-based distributed temperature sensor utilizing a fiber Bragg grating notch filter to suppress the Rayleigh backscatter in order to separate the Brillouin signal. The Brillouin light path is thus subject to minimum attenuation and is frequency independent. A 2-m spatial resolution is achieved over a range of 25 km with the temperature resolution rising from 1/spl deg/C at the near end to 7/spl deg/C at the far end in a measurement time of 10 min. This is reduced to <1/spl deg/C over /spl sim/20 km if the measurement time is increased to 180 min.
44 citations
TL;DR: A novel scheme to generate and detect Brillouin dynamic grating in a polarization-maintaining optical fiber based on one laser source and distributed discrimination of strain and temperature is achieved with high accuracy.
Abstract: This paper presents a novel scheme to generate and detect Brillouin dynamic grating in a polarization-maintaining optical fiber based on one laser source. Precise measurement of Brillouin dynamic grating spectrum is achieved benefiting from that the pump, probe and readout waves are coherently originated from the same laser source. Distributed discrimination of strain and temperature is also achieved with high accuracy.
44 citations
TL;DR: In this article, the static and spin wave properties of regular square lattices of magnetic dots of 0.5-2 μm dot diameter and 1-4 μm periodicity patterned in permalloy films have been investigated by Brillouin light scattering.
Abstract: The static and spin wave properties of regular square lattices of magnetic dots of 0.5–2 μm dot diameter and 1–4 μm periodicity patterned in permalloy films have been investigated by Brillouin light scattering. The samples have been structured using x-ray lithography and ion beam etching. The Brillouin light scattering spectra reveal both surface and bulk spin wave modes. The spin wave frequencies can be well described taking into account the demagnetization factor of each single dot. For the samples with smallest dot separation of 0.1 μm a fourfold in-plane magnetic anisotropy with the easy axis directed along the pattern diagonal is observed, indicating anisotropic coupling between the dots.
44 citations
TL;DR: In this paper, the authors used multi-frequency phase modulation to generate equal-amplitude spectral lines for stimulated Brillouin scattering (SBS) suppression, and obtained the spectra of three, five, seven, and eleven equal amplitude lines with flatness less than 0.3 dB.
Abstract: The method of generating equal-amplitude spectral lines by multi-frequency phase modulation is used in stimulated Brillouin scattering (SBS) suppression. The spectra of three, five, seven, and eleven equal-amplitude spectral lines are obtained in experiment with flatnesses less than 0.3 dB. Theoretical research on SBS suppression shows that the threshold power after modulation is in reverse proportion to the maximum square of amplitude moduli of fundamental frequency and the nth harmonic wave. The threshold powers of three, five, seven, and eleven equal-amplitude spectral lines are improved by 5.21, 8.36, 9.39, and 10.76 dB, respectively.
44 citations
TL;DR: In this article, the results of ultrasonic pulse propagation experiments on suspensions of plastic spherical scatterers immersed in water were presented, showing that the dispersion relation is marked by a series of hybridization gaps due to the coupling between the propagating modes of surrounding fluid and the scattering resonances.
Abstract: We present the results of ultrasonic pulse propagation experiments on suspensions of plastic spherical scatterers immersed in water. This system was selected to study the effects of scattering resonances on wave transport. By separating the coherent ballistic component from the multiply scattered wave field, both the dispersion relations and the diffusive propagation of ultrasound were investigated. We show that the dispersion relation is marked by a series of hybridization gaps due to the coupling between the propagating modes of surrounding fluid and the scattering resonances. Effects of dissipation on the formation of the gaps were investigated. We find evidence in our ultrasonic data for the existence of a (slowly propagating) second longitudinal mode, also seen in Brillouin scattering experiments, that arises from the coupling between the resonant scatterers. These results are interpreted with an effective medium model based on the spectral function approach, which gives an excellent description of the dispersion relations in this system. Measurements of the multiply scattered ultrasound allow both the diffusion coefficient and the absorption time to be measured as a function of frequency. The relationship between the diffusion coefficient and the ballistic data is discussed, while the measurement of the absorption time from the decay of the multiply scattered coda enables the absorption and scattering lengths to be separated. These ultrasonic measurements and their interpretation based on the spectral function approach give a very complete picture of wave transport in this strongly scattering resonant system.
44 citations