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: Characterization of stimulated Brillouin scattering in a few-mode fiber (FMF) is experimentally demonstrated, where the BrillouIn gain spectrum (BGS) of intramodal or intermodal SBS is analyzed for different pump-probe pairs of four LP modes--LP(01), LP(11, LP(21), and LP(02) modes--guided in the fiber.
Abstract: Characterization of stimulated Brillouin scattering (SBS) in a few-mode fiber (FMF) is experimentally demonstrated, where the Brillouin gain spectrum (BGS) of intramodal or intermodal SBS is analyzed for different pump–probe pairs of four LP modes—LP01, LP11, LP21, and LP02 modes—guided in the fiber. A mode-division multiplexer composed of concatenated mode-selective couplers is applied for selective launching of each LP mode, and a differential measurement scheme is adopted for the analysis of the BGS. The intermodal SBS is observed in each pump–probe pair of different modes, and the Brillouin gain is measured to be within 14%–45% of that of the SBS between the LP01 modes. The SBS threshold of each LP mode in the FMF is also evaluated.
51 citations
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51 citations
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TL;DR: In this article, several guided acoustic modes are identified to be responsible for the stimulated backward Brillouin scattering (SBBS) in single-mode optical fibres (SMFs), and the dependence of SBBS gain spectra on acoustic properties of SMF is discussed.
Abstract: Several guided acoustic modes are identified to be responsible for the stimulated backward Brillouin scattering (SBBS) in single-mode optical fibres (SMFs). The dependence of SBBS gain spectra on acoustic properties of SMF is discussed.
51 citations
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TL;DR: In this paper, a comprehensive study of the Rayleigh-Brillouin scattering spectra of oterphenyl in the liquid and supercooled liquid state has been carried out.
Abstract: A comprehensive study of the Rayleigh–Brillouin scattering spectra of o‐terphenyl in the liquid and supercooled liquid state has been carried out. Anomalies in the Brillouin frequency and linewidth data are observed at the glass transition temperature (Tg) and at a temperature (TK) about 36 K higher than the melting point. The anomaly at Tg is due to the absence of free volume associated with the freezing‐in of the density fluctuation. The longitudinal hypersonic frequency kink as well as the linewidth maximum and the dimunition of the transverse sound frequency at TK are interpreted as due to the relaxation of translational order which disappears above TK. The result of the depolarized Rayleigh scattering spectral study shows that cluster formation as previously proposed is unlikely. Hydrodynamic slip boundary conditions for molecular reorientation are found to be appropriate in liquid o‐terphenyl. Rotation about the short and long axes lying in the plane of the parent phenyl ring is found to be consiste...
51 citations
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TL;DR: Numerical calculations for backward-SBS at 4 μm in germanium waveguides that are buried in silicon nitride are presented and the acoustic wave equation is solved including crystal anisotropy.
Abstract: In a theoretical design study, we propose buried waveguides made of germanium or alloys of germanium and other group-IV elements as a CMOS-compatible platform for robust, high-gain stimulated Brillouin scattering (SBS) applications in the mid-infrared regime. To this end, we present numerical calculations for backward-SBS at 4 μm in germanium waveguides that are buried in silicon nitride. Due to the strong photoelastic anisotropy of germanium, we investigate two different orientations of the germanium crystal with respect to the waveguide’s propagation direction and find considerable differences. The acoustic wave equation is solved including crystal anisotropy; acoustic losses are computed from the acoustic mode patterns and previously published material parameters.
51 citations