Characterization of depolarized GAWBS for optomechanical sensing of liquids outside standard fibers

Neisei Hayashi; Yosuke Mizuno; Kentaro Nakamura; Sze Yun Set; Shinji Yamashita

doi:10.1117/12.2262964

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23 April 2017 Characterization of depolarized GAWBS for optomechanical sensing of liquids outside standard fibers

Neisei Hayashi, Yosuke Mizuno, Kentaro Nakamura, Sze Yun Set, Shinji Yamashita

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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103230M (2017) https://doi.org/10.1117/12.2262964
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

We report an experimental study on the spectral dependence of depolarized guided acoustic-wave Brillouin scattering (GAWBS) in a silica single-mode fiber (SMF) on acoustic impedance of external materials. The GAWBS spectrum was measured when the acoustic impedance was changed from 1.51 to 2.35 kg/s⋅mm². With increasing acoustic impedance, the linewidth increased; the dependence was almost linear in the range up to ∼2.0 kg/s⋅mm² with an acoustic impedance dependence coefficient of 0.16 MHz/kg/s⋅mm², which is directly applicable to acoustic impedance sensing. Meanwhile, with increasing acoustic impedance, the central frequency nonlinearly decreased, which probably originates from the change in the effective outer diameter of the silica SMF.

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Neisei Hayashi, Yosuke Mizuno, Kentaro Nakamura, Sze Yun Set, and Shinji Yamashita "Characterization of depolarized GAWBS for optomechanical sensing of liquids outside standard fibers", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103230M (23 April 2017); https://doi.org/10.1117/12.2262964

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