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 model based on the Bloch wave approach was proposed for spin wave propagation in an array of magnetic stripes coupled by dynamic dipole interaction, and it was demonstrated that this structure supports propagation of discrete spin waves at any angle with respect to the stripes length.
Abstract: Collective spin wave modes propagating in an array of magnetic stripes coupled by dynamic dipole interaction are investigated by Brillouin light scattering. It is demonstrated that this structure supports propagation of discrete spin waves at any angle with respect to the stripes length. The data are interpreted using a theoretical model based on the Bloch wave approach. It is shown that, due to the one-dimensional artificial periodicity of the medium, the gaps in the spin wave spectrum are partial: the frequency passbands for propagation along the direction of periodicity overlap with the stop bands for propagation along the stripes.
86 citations
TL;DR: In this paper, a high-spatial-resolution simultaneous strain and temperature measurement in time domain through measuring Brillouin frequency shift and birefringence-induced frequency shift (BireFS) in a polarization-maintaining fiber is reported.
Abstract: We report on a high-spatial-resolution simultaneous strain and temperature measurement in time domain through measuring Brillouin frequency shift (BFS) and birefringence-induced frequency shift (BireFS) in a polarization-maintaining fiber. High-spatial-resolution BFS and BireFS measurement are obtained through differential pulsewidth pair Brillouin optical time-domain analysis and a local Brillouin grating, respectively. Simultaneous strain and temperature measurement with a spatial resolution of 20 cm is demonstrated in a 6-m Panda fiber. The temperature and strain accuracy is 0.4°C and 9 μe, and their range can be up to 700°C and 14 me, respectively.
85 citations
TL;DR: In this article, the authors show that saturation of the population inversion reduces the stimulated thermal Rayleigh gain relative to the laser gain in large mode area fiber amplifiers, and exploit this effect to raise mode instability thresholds by a substantial factor.
Abstract: We show by numerical modeling that saturation of the population inversion reduces the stimulated thermal Rayleigh gain relative to the laser gain in large mode area fiber amplifiers. We show how to exploit this effect to raise mode instability thresholds by a substantial factor. We also demonstrate that when suppression of stimulated Brillouin scattering and the population saturation effect are both taken into account, counter-pumped amplifiers have higher mode instability thresholds than co-pumped amplifiers for fully Yb$^{3+}$ doped cores, and confined doping can further raise the thresholds.
85 citations
TL;DR: In this article, a novel homodyne detection technique which avoids optoelectronic phase locking by using stimulated Brillouin gain to selectively amplify the signal carrier is described, which avoids optical phase locking.
Abstract: A novel homodyne detection technique which avoids optoelectronic phase-locking by using stimulated Brillouin gain to selectively amplify the signal carrier is described.
85 citations
TL;DR: The study reveals that the coherent portion inside the pulse length of these two interactions caused by the same phase is responsible for this behavior, and allows us to detect 1.5-cm outer-layer cracks on an optical ground-wire cable.
Abstract: We provide a theoretical explanation for a coherent probe-pump-based Brillouin sensor system that achieves centimeter spatial resolution with high-frequency resolution. It was recently discovered that, when a combination of cw and pulsed light (the probe beam) interacts with a cw laser (the pump beam), centimeter spatial resolution with high-frequency resolution can be achieved even though the probe-pulse duration is 1.5 ns [Opt. Lett.29, 1485 (2004)]. Our study reveals that the coherent portion inside the pulse length of these two interactions caused by the same phase is responsible for this behavior. It allows us to detect 1.5-cm outer-layer cracks on an optical ground-wire cable.
85 citations