Abstract

Optical probing of acoustic waves provides a noncontacting method of making high-resolution measurements of the amplitude and phase of surface displacements associated with acoustic waves. Two probes have been developed for this purpose. The first uses both bulk and fiber components. It is a fiber-optic variation of the heterodyne interferometric probe used by De La Rue et al.¹ Since long lengths of fiber can be placed between the laser and the sample without significant losses, large samples can be mechanically scanned with the probe head. The second probe uses an all-fiber approach. Consequently, this probe is considerably smaller and more rugged.

© 1982 Optical Society of America