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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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Journal ArticleDOI
TL;DR: In this article, a novel all-optical technique for microwave/millimeter-wave generation using two-frequency fiber Bragg grating (FBG)-based Brillouin fiber laser is presented.
Abstract: A novel all-optical technique for microwave/millimeter-wave generation using two-frequency fiber Bragg grating (FBG)-based Brillouin fiber laser is presented. The mechanism for the microwave and millimeter-wave generation is theoretically analyzed. An approximately 33-GHz millimeter wave can be achieved through mixing the pump wave with the third Stokes' wave. In the experiment, an 11-GHz microwave signal is attained. The microwave frequency can be tuned by varying temperature of the fiber Fabry-Pe/spl acute/rot cavity of the Brillouin fiber laser. A more than 100-MHz tuning range around a frequency of 11 GHz is experimentally achieved.

65 citations

Journal ArticleDOI
F.W. Willems1, W. Muys1, J.S. Leong1
TL;DR: In this article, the effects of phase-to-intensity noise conversion by multipath interference through Rayleigh scattering are counteracted simultaneously without introducing additional intermodulation distortion, both by single tone phase modulation and by dithering of the laser's optical frequency.
Abstract: Externally modulated AM-SCM lightwave systems employing optical power amplifiers, small linewidth DFB lasers and long optical feeder lines, face low stimulated Brillouin scattering threshold powers and phase-to-intensity noise conversion by multipath interference through Rayleigh scattering. We show that these problems can be effectively counteracted simultaneously without introducing additional intermodulation distortion, both by single tone phase modulation and by dithering of the laser's optical frequency. >

65 citations

Journal ArticleDOI
TL;DR: In this paper, a Q-switched mode-locked 532-nm laser was used to satisfy the input resonance condition of various low-order (l = 2 to l = 4) TE and TM morphology-dependent resonances in 23.0-23.7-μm-diameter ethanol droplets.
Abstract: Programmed size ramping of an aerosol stream permits a Q-switched mode-locked 532-nm laser to satisfy periodically the input resonance condition of various low-order (l = 2 to l = 4) TE and TM morphology-dependent resonances in 23.0–23.7-μm-diameter ethanol droplets. The resulting size-versus-amplitude spectra of stimulated Raman scattered light revealed high-Q modes that are not normally observed in elastic scattering. Simultaneous elastic scattering measurements permit unambiguous identification of these input resonances. The relative output intensities of stimulated Raman scattering and time histories imply that the Q of the l = 2 modes is degraded to a value of 107 by the departure of the droplet from an ideal homogeneous sphere.

65 citations

Journal ArticleDOI
TL;DR: In this paper, the Brillouin light scattering technique was successfully applied for determining the five effective elastic constants of a single transparent film of hexagonal symmetry, in the micron range of thicknesses.
Abstract: In this work it is shown that the Brillouin light scattering technique can be successfully applied for determining the five effective elastic constants of a single transparent film of hexagonal symmetry, in the micron range of thicknesses. Measurements have been performed on a polycrystalline ZnO film, about 1.3 mu m thick, supported by a Si substrate. A major result of this work is that the elastic constant c66 is selectively determined for the first time from detection of the shear horizontal mode travelling parallel to the film surface. Similarly, a selective determination of c11 is attained from observation of the longitudinal mode guided by the film. The three remaining elastic constants, namely c13, c33, and c44, can be then obtained from detection of the Rayleigh surface mode and of the longitudinal bulk wave propagating at different angles from the surface normal.

65 citations

Journal ArticleDOI
TL;DR: In this paper, the velocity and attenuation of longitudinal and transverse waves have been measured for frequencies ranging between 5 MHz and 35 GHz on the same sample of vitreous silica, and the main features of the ultrasonic results are described on the basis of the usual model assuming a coupling of phonons with a thermally activated relaxation.
Abstract: The velocity and attenuation of longitudinal and transverse waves have been measured for frequencies ranging between 5 MHz and 35 GHz on the same sample of vitreous silica. The main features of the ultrasonic results are described on the basis of the usual model assuming a coupling of phonons with a thermally activated relaxation. In contrast, the frequency dependence of the attenuation peak and velocity minimum are in quantitative disagreement with the calculations based on this model. Above 100 K, at least half of the attenuation at high frequencies has to be assigned to another physical origin, most likely anharmonic three-phonon interactions. Furthermore, the minimum in the hypersonic velocity seems to occur as the result of a combination of dispersion processes more than from the frequency-temperature shift of a relaxational dispersion.

65 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023237
2022471
2021289
2020342
2019433
2018404