Inherent spectral distortions in pump-probe Brillouin scattering spectroscopy

•Specific pump-probe technique distortions to an experimentally registered spectrum of Brillouin scattering are presented.•The distortions are consequences of fundamental properties of excitation and propagation of elastic waves in continuous media.•The experimental evidence is found for a supersoni...

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Bibliographic Details
Published in:Physics letters. A 2019-04, Vol.383 (12), p.1378-1380
Main Author: Kovalev, Valeri I.
Format: Article
Language:English
Subjects:
Brillouin scattering spectroscopy
Pump-probe technique
Stimulated Brillouin scattering
Supersonic motion
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Summary:•Specific pump-probe technique distortions to an experimentally registered spectrum of Brillouin scattering are presented.•The distortions are consequences of fundamental properties of excitation and propagation of elastic waves in continuous media.•The experimental evidence is found for a supersonic wave caused nonlinearity of the material response in SBS interactions. It is shown that the pump-probe technique in Brillouin scattering spectroscopy is accompanied by two specific distortions to a registered spectrum. The first appears due to an acoustic wave that unavoidably accompanies in a continuous medium the density wave driven by the pump and probe signals. The registered spectrum then splits to two spectral components, one corresponding to the propagation velocity of the driven density wave, and the other to the acoustic velocity. The other distortion is asymmetry of the spectrum which is shown to occur when the velocity of the driven density wave is greater than the acoustic velocity in the medium.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2019.01.031