Inelastic scattering of light by acoustic waves from a medium are known as Brillouin scattering. This effect was demonstrated by Léon Brillouin. Laser beam with high power enables Brillouin scattering thanks to acoustic vibrations in polymethyl methacrylate (PMMA). This phenomenon is known as stimulated Brillouin scattering. In our case we use a commercial bench based on the J. R. Sandercock multipass tandem interferometer design. Our study aims to gain confidence in knowing if the result given by the bench can lead to a more precise determination of the order of magnitude of the uncertainty associated with the result obtained in terms of deviation to the optical carrier. We determine the uncertainty to be ± 0.26% at 2 σ based on a modern approach. We intend to present it at the conference to give indications on the expected uncertainty terms of the microwave signal deviation of the carrier at 532 nm, characterising PMMA.
Through this paper, we describe the method leading to the estimation of the uncertainty. We aim to give an estimation of the uncertainty on the frequency peak by Brillouin Scattering Stimulation. It corresponds to the speed of phonons inside a material excited by a 532nm wavelength laser. The guideline follows the Guide to the Expression of Uncertainty in Measurement and its estimation is of 0.26% on the Brillouin frequency peak at 15.70 GHz for polymethyl methacrylate (PMMA).
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