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Stimulated Brillouin scattering in high-birefringence elliptical-core As2Se3-PMMA microfibers

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Abstract

In this Letter, we design and fabricate elliptical-core (ECORE) chalcogenide-polymethyl methacrylate (${{\rm As}_2}{{\rm Se}_3}$-PMMA) microfibers to explore the birefringence impact on stimulated Brillouin scattering. Numerical simulations based on the finite-element method and elastodynamic equation are utilized to calculate the phase and group birefringence and Brillouin gain spectra of the fundamental mode in three ECORE ${{\rm As}_2}{{\rm Se}_3}$-PMMA microfibers at different core diameters. Experimentally measured and numerically calculated results show that as the core diameter of the minor axis of an ECORE microfiber with a ratio of 1.108 is reduced from 1.50 µm to 0.87 µm, a high group birefringence of ${\sim}{10^{- 3}}$ to ${\sim}{10^{- 2}}$ and a large Brillouin frequency shift difference of ${\sim}6\;{\rm MHz} $ to ${\sim}30\;{\rm MHz} $ are achieved, while the Brillouin gain spectra are broadened significantly from ${\sim}70\;{\rm MHz} $ to ${\sim}140\;{\rm MHz} $. The high-birefringence ECORE ${{\rm As}_2}{{\rm Se}_3}$-PMMA microfiber is important for Brillouin sensing due to the tailorable high birefringence and ultrahigh nonlinearity.

© 2021 Optical Society of America

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