The results of an investigation of the optical and piezoelectric properties of a Si-SiO₂-ZnO microstructure via pulsed-laser optoacoustic spectroscopy are presented. Using optoacoustic probing, the speed of an acoustic wave propagating in the zinc oxide layer was calculated to be 3.01 × 10³ m/s, and the acoustic wave absorption coefficient was determined to be 3.45 dB/cm. The acousto-optic constant M2 for the ZnO film was determined to be 8.78 × 10^-18 s³/g using the modified Dixon method.