High-speed continuous-wave stimulated brillouin scattering spectrometer for material analysis

Itay Remer, Lear Cohen, Alberto Bilenca

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Recent years have witnessed a significant increase in the use of spontaneous Brillouin spectrometers for non-contact analysis of soft matter, such as aqueous solutions and biomaterials, with fast acquisition times. Here, we discuss the assembly and operation of a Brillouin spectrometer that uses stimulated Brillouin scattering (SBS) to measure stimulated Brillouin gain (SBG) spectra of water and lipid emulsion-based tissuelike samples in transmission mode with <10 MHz spectral-resolution and <35 MHz Brillouin-shift measurement precision at <100 ms. The spectrometer consists of two nearly counter-propagating continuous-wave (CW) narrow-linewidth lasers at 780 nm whose frequency detuning is scanned through the material Brillouin shift. By using an ultra-narrowband hot rubidium-85 vapor notch filter and a phase-sensitive detector, the signal-to-noise-ratio of the SBG signal is significantly enhanced compared to that obtained with existing CW-SBS spectrometers. This improvement enables measurement of SBG spectra with up to 100-fold faster acquisition times, thereby facilitating high spectral-resolution and high-precision Brillouin analysis of soft materials at high speed.

Original languageEnglish
Article numbere55527
JournalJournal of Visualized Experiments
Volume2017
Issue number127
DOIs
StatePublished - 22 Sep 2017

Keywords

  • Engineering
  • Issue 127
  • Material analysis
  • Nonlinear spectroscopy
  • Phase-sensitive detection
  • Spectrometers
  • Stimulated brillouin scattering
  • Vapor Cells

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