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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
D. Cotter1
TL;DR: In this paper, the authors analyzed the transient stimulated scattering produced when the laser is modulated, and concluded that the limitations due to SBS could be circumvented by using particular modulation techniques.
Abstract: Recent experiments show that stimulated Brillouin scattering (SBS) in low-loss fibres could place a severe limitation on optical power levels for coherent optical transmission. The letter analyses the transient stimulated scattering produced when the laser is modulated, and it is concluded that the limitations due to SBS could be circumvented by using particular modulation techniques.

57 citations

Journal ArticleDOI
TL;DR: Stimulated scattering by molecular vibrations and librations was investigated using trains of subnano-second light pulses in this paper, and the results showed that the effects of molecular vibrations on the scattering were independent of each other.

57 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used the probe-pump coupled equations combined with Raman amplification to obtain the enhanced sensing performance in long-distance Brillouin optical time-domain analyzer (BOTDA) with higher temperature measurement accuracy over the whole sensing fiber.
Abstract: The Raman amplification can be employed to obtain the enhanced sensing performance in long-distance Brillouin optical time-domain analyzer (BOTDA) with higher temperature measurement accuracy over the whole sensing fiber. Theoretical investigation on the detected probe waveshape has been performed by using the probe-pump coupled equations combined with Raman amplification. The experimental characterization has been demonstrated to validate the theoretical prediction. The results show that, the 75 Km sensing distance can be achieved by utilizing the bi-directional Raman amplification with measurement accuracy of ±0.6°C over the whole sensing fiber. The larger Raman power and Brillouin pump power are helpful to improve the sensing signal-noise ratio (SNR). There exists an optimum range for the input probe power and the extinction ratio (ER) of input Brillouin pump pulse. The BOTDA with Raman amplification has considerable potentials to realize long- distance strain and temperature measurement for structural health monitoring and fire alarming, etc.

57 citations

Journal ArticleDOI
TL;DR: In this article, the number and the nature of the relaxation processes active in this prototype glass forming system in the high frequency region were investigated. But the results were limited to the GHz frequency region, while the contributions coming from intramolecular channels are negligible.
Abstract: Brillouin scattering has been used to measure the dynamic structure factor of glycerol as a function of temperature from the high temperature liquid to the glassy state. Our investigation aims at understanding the number and the nature of the relaxation processes active in this prototype glass forming system in the high frequency region. The associated character of glycerol is reflected by a rather simple relaxation pattern, while the contributions coming from intramolecular channels are negligible in the GHz frequency region. The temperature behavior of the characteristic frequency and lifetime of the longitudinal acoustic modes is analyzed, suggesting that a phenomenological model which only includes the structural (α) process and the unrelaxed viscosity is able to catch the leading contributions to the dynamics of the density fluctuations. This ansatz is also supported by a combined analysis of light and inelastic x-ray scattering spectra. The temperature dependence of the characteristic time of the α-...

57 citations

Journal ArticleDOI
TL;DR: In this article, a frequency-sweep-free method for stimulated Brillouin scattering (SBS)-based sensing is proposed, which has the potential for fast acquisition characteristics.
Abstract: A frequency-sweep-free method for stimulated Brillouin scattering (SBS)-based sensing is proposed, having the potential for fast acquisition characteristics. The Brillouin gain spectrum and the Brillouin frequency shift are determined using multiple frequency tones for both the probe and pump. While in this paper, continuous wave probe and pump waves are used to prove the feasibility of the concept, an extension to fast distributed sensing, using pulsed pumps, is also described.

57 citations


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