Excitation of Hypersonic Vibrations by Means of Photoelastic Coupling of High-Intensity Light Waves to Elastic Waves

TLDR

It is similar in character to the theory of optical parametric amplification in spatially extended media. A theory of the excitation of elastic waves arising from photoelastic coupling with light is presented, with special attention given to the self‑excited transient case. The theory introduces a novel space–time instability model that applies when the interaction region is large relative to the elastic wave travel distance during illumination. The predicted effects should be readily observable with existing giant pulse lasers.

Abstract

A theory of the excitation of elastic waves arising from photoelastic coupling with light is presented. It is similar in character to the theory of optical parametric amplification in spatially extended media. Special attention is given to the self-excited transient case. A novel form for the space—time development of the instability appears for the case in which the spatial dimensions of the interaction region are large compared to the distance traveled by an elastic wave during the illumination time. The predicted effects should be readily observable with existing giant pulse lasers.