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Updated: Jul 14, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
Published on: December 22, 2015
Fully automated time domain spectrometer for the absorption and scattering characterization of diffusive media
Antonio Pifferi1, Alessandro Torricelli, Paola Taroni
1ULTRAS-CNR-INFM and IFN-CNR, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy. antonio.pifferi@polimi.it
Abstract:
We describe a system for absorption and scattering spectroscopy of diffusive media based on time-resolved reflectance and transmittance measurements. The system is operated with mode-locked lasers tunable in the 550-1050 nm spectral range and on a detection chain based on time-correlated single-photon counting. All measurement procedures such as laser tuning and optimization, signal conditioning, data acquisition, and analysis are completely automated, permitting spectral measurements over the whole range in a few minutes. The criticalities of the system are discussed together with the strategies to compensate them. The Medphot protocol devised for the characterization of photon migration instruments was applied to assess the system performances in terms of accuracy, linearity, noise, stability, and reproducibility. Finally, an example of application of the instrument to the spectroscopy of powders is presented.
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