R.J. Von Gutfeld, D.R. Vigliotti, et al.
Applied Physics Letters
Paper
Thermoelastic hologram for focused ultrasound
Abstract
An acoustic holographic lens structure is described for generating thermoelastic waves from the energy of absorbed laser excitation. The structure uses a large area optically absorbing surface to permit the megahertz ultrasound to be focused for nondestructive evaluation applications. Experimental results for the spatial distribution of 10-MHz ultrasonic waves obtained from the hologram are presented.