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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01 Jan 2006
TL;DR: In this paper, the authors restrict themselves to the problems of absorption absorption, elastic, and inelastic Raman scattering of light, and fluorescence [45, 62] in natural waters.
Abstract: In this chapter we restrict ourselves to the problems of absorptionabsorption [1–13], elastic [1, 4, 5, 10, 14–22] and inelastic Raman [23–44] scattering of light, and fluorescence [45–62] in natural waters. Owing to the lack of clear and simple numerical procedures that connect scattering with easily measurable environmental parameters, scattering by air bubbles in water [63–65], Brillouin scattering [37, 66–69], and amplification of forward scattering by water turbulence [70, 71] are omitted from consideration. All conclusions of this chapter will be obtained mostly from analysis of experimental data with some additions derived from theory and from analysis of numerical computations. We will discuss in detail two basic inherent optical properties of natural water, the absorption coefficient, a, the angular scattering coefficient, β, and inelastic parameters of Raman scattering and fluorescence that are included as input parameters in a scalar radiative transfer equation: [ 1
51 citations
TL;DR: In this paper, the linear response theory using a complete set of dynamic variables involving density, velocity, and energy fluctuations is used to analyze the Rayleigh-Brillouin spectrum of a viscoelastic liquid.
Abstract: The linear response theory using a complete set of dynamic variables involving density, velocity, and energy fluctuations is used to analyze the Rayleigh–Brillouin spectrum of a viscoelastic liquid. The result is discussed in the fast and slow relaxation limits. In the former case, the Rayleigh–Brillouin spectrum is identical to that predicted by the classical hydrodynamic equations; whereas in the latter case a new structural central peak is found, in addition to the anomalous dispersion and relaxation effects present in the frequency and linewidth data associated with the Brillouin peak. The evolution of structural relaxation and its effect on the entire Rayleigh–Brillouin spectrum is described. The structural central peak is most pronounced when the frequency dispersion and the linewidth maximum are present. The theoretical result has been used to calculate the Rayleigh–Brillouin spectra of polypropylene glycol at various temperatures. The results of the frequency shift, the spectral linewidth, and the Landau–Placzek ratio are in good agreement with the experiment.
51 citations
TL;DR: In this article, a polarization-independent fast and distributed frequency-scanning Brillouin optical time-domain analysis (BOTDA) technique is presented, capable of acquiring the full spectrum at a speed limited only by the fiber length and the employed frequency scanning granularity.
Abstract: A polarization-independent fast and distributed frequency-scanning Brillouin optical time-domain analysis (BOTDA) technique is presented, capable of acquiring the full Brillouin gain spectrum at a speed limited only by the fiber length and the employed frequency scanning granularity. For a 145-m long fiber and 71 interrogating frequencies, the ultimate measurement speed of 9700 [full-fiber-Brillouin-gain-spectra]/second is demonstrated, covering a strain dynamic range of 4200 μe with an accuracy of ±10 μe. Dynamic measurements with a spatial resolution of 10 cm are also demonstrated by combining the technique with the double pulse pair BOTDA method.
51 citations
TL;DR: It is demonstrated here that, in this case the stochastic nature of noise requires an inclusion of length dependent corrections to the SBS threshold enhancement.
Abstract: Phase and/or intensity modulation techniques to broaden the Linewidth of an optical source are well known methods to suppress stimulated Brillouin scattering (SBS) in optical fibers. A common technique used to achieve significant bandwidth enhancement in a simple fashion is to phase modulate with a filtered noise source. We will demonstrate here that, in this case the stochastic nature of noise requires an inclusion of length dependent corrections to the SBS threshold enhancement. This effect becomes particularly significant for short fiber lengths common to most high power fiber amplifiers.
51 citations
TL;DR: Etude des spectres de diffusion Brillouin dans l'etat normal et dans leetat surfondu metastable jusqu'a −27,0°C.
Abstract: Etude des spectres de diffusion Brillouin dans l'etat normal et dans l'etat surfondu metastable jusqu'a −27,0°C. Deduction de l'absorption et de la vitesse d'hypersons
51 citations