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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: An enhanced multiwavelength L-band Brillouin-erbium fiber laser (BEFL) is demonstrated, in which the BrillouIn pump is pre-amplified before entering the single-mode fiber, and the number of output channels is enhanced within the same tuning range.
Abstract: We demonstrate an enhanced multiwavelength L-band Brillouin-erbium fiber laser (BEFL), in which the Brillouin pump is pre-amplified before entering the single-mode fiber. The Brillouin pump pre-amplification provided by the Erbium-doped fiber has created higher intensity of Brillouin Stokes line generated in the single-mode fiber that leads to the homogenous gain saturation. Thus the built-up of self-lasing cavity modes is suppressed in a wider wavelength range. In contrary to the conventional linear-cavity BEFL, the number of output channels is enhanced within the same tuning range.

70 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used Brillouin spectroscopy to provide information about the hypersonic velocity and absorption of thermal waves in a glass-forming 60% KNO3-40% Ca(NO3)2 mixture (mol %) in a temperature range of 90-380°C for gigahertzian frequencies.
Abstract: Brillouin spectroscopy has been used to provide information about the hypersonic velocity and absorption of thermal waves in a glass‐forming 60% KNO3–40% Ca(NO3)2 mixture (mol %) in a temperature range of 90–380°C for gigahertzian frequencies. A relaxation process was revealed in both the longitudinal velocity and attenuation. The data are consistent with ultrasonic results for the limiting low‐frequency velocity. The limiting high‐frequency velocity is considerably larger than that reported from ultrasonic studies and the position of the maximum of the amplitude absorption coefficient is shifted to higher temperatures. The variation of the relaxation time with temperature was found to be Arrhenius with a temperature‐independent activation energy in excellent accordance with the model proposed by Weiler, Bose, and Macedo. At low temperatures, a transverse mode due to shear waves was observed close to the Rayleigh line.

70 citations

Journal ArticleDOI
TL;DR: A Brillouin-based fully distributed and dynamic monitoring of the strain induced by a propagating mechanical wave along a 20 m long composite strip, to which surface a single-mode optical fiber was glued.
Abstract: We report a Brillouin-based fully distributed and dynamic monitoring of the strain induced by a propagating mechanical wave along a 20m long composite strip, to which surface a single-mode optical fiber was glued. Employing a simplified version of the Slope-Assisted Brillouin Optical Time Domain Analysis (SA-BOTDA) technique, the whole length of the strip was interrogated every 10ms (strip sampling rate of 100Hz) with a spatial resolution of the order of 1m. A dynamic spatially and temporally continuous map of the strain was obtained, whose temporal behavior at four discrete locations was verified against co-located fiber Bragg gratings. With a trade-off among sampling rate, range and signal to noise ratio, kHz sampling rates and hundreds of meters of range can be obtained with resolution down to a few centimeters.

70 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of a finite-band with pump on the parametric instability is considered, with bandwidth modelled by a Kubo-Anderson process, and exact results are obtained for both the amplitudes and power in each decay mode.
Abstract: The effect of a finite-bandwith pump on the parametric instability is considered. First, the temporal problem with unequal damping rates is considered, with bandwidth modelled by a Kubo-Anderson process. Exact results are obtained for both the amplitudes and power in each decay mode, with an interesting asymmetry found. Next, the spatial problem with unequal group velocities is investigated for the cases of 1) finite homogeneous interaction region, and 2) linear density profile. Thresholds and growthrates are found including both the inhomogeneity and bandwidth effects. When values typical of laser fusion parameters are inserted, it is found that bandwidth may be an important method of stabilizing Raman and Brillouin scattering.

70 citations

Journal ArticleDOI
TL;DR: In this article, the second-order elastic moduli of tetragonal hen egg-white lysozyme crystals were determined as a function of relative humidity (RH) by Brillouin scattering.

69 citations


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