Pulsed opto-acoustics: Theory and applications

An overview of the technique of pulsed opto-acoustics, whereby an excitation beam of short pulse-duration and low duty cycle is used to generate acoustic transients which are detected by contract as well as non-contact acoustic detection techniques is presented. Theories of pulsed opto-acoustic generation depending on the source dimensions for the simple case of weak optical absorptions are discussed. Various methods of acoustic detection involving piezoelectric ceramics, thin films, or optical beams are reviewed. Applications discussed include monitoring weak absorptions in highly transparent materials or in trace detection, acoustic materials testing utilizing either contact or non-contact detection methods, and the generation of very high pressure transients.