Brillouin spectroscopy has emerged as a great modality to non-invasively target mechanical properties in material and biological samples, although it requires high-performance spectrometers and long acquisition times to extract the Brillouin peaks with high SNR and precision. Stimulated Brillouin scattering (SBS) has the potential to improve speed and resolution, achieving a resonant amplification of the scattered signal through the interaction of two counterpropagating laser beams. However, the overall performances of current SBS spectrometers result just comparable to spontaneous Brillouin, and this may indicate that the system is operating with suboptimal acquisition parameters. Here, we will investigate this hypothesis introducing the localization theory in the estimation of the peak position in SBS spectroscopy and demonstrating a ten times improvement in acquisition speed, retaining SNR and precision, by simply designing an SBS spectrometer with proper acquisition parameters.
|