Optoacoustic characteristics of single-mode fiber waveguides

An experimental determination was made of the phase sensitivity of two- and three-layer fiber waveguides to acoustic pressure at the optical wavelength λ = 0.63 μ. It was found that the sensitivity was μ=(k₀l )^-1∂φ /∂p = (1–2)×10^–10 Pa^–1. This should make it possible to use such fiber waveguides as sensitive transducers of acoustic pressure.