Inherent spectral distortions in pump-probe Brillouin scattering spectroscopy

Publication date: Available online 21 January 2019Source: Physics Letters AAuthor(s): V.I. KovalevAbstractIt 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.

Source: Physics Letters A - January 22, 2019 Category: Physics Source Type: research