W. Zapka, Winfrid Ziemlich, et al.
Advanced Materials for Optics and Electronics
Photoacoustic generation, i.e. light producing sound, can be due to a variety of causes and can be used for different applications. In the application area of acoustic imaging and non-destructive evaluation, photoacoustic generation is usually produced via the thermoelastic expansion effect due to the absorption of a pulsed or rapidly-modulated laser beam on an opaque surface. To obtain large amplitude acoustic waves or shock waves, the effect of photo-ablation of a thin-film on the surface can also be used. Detection of the photoacoustic pulse can be done either by contact transducer measurement or by non-contact optical measurement. Application of these effects in materials testing is described.
W. Zapka, Winfrid Ziemlich, et al.
Advanced Materials for Optics and Electronics
A.C. Tam, W. Zapka, et al.
SPIE Microelectronic Processing Integration 1991
A.C. Tam, H. Sontag, et al.
IUS 1984
P. Korpiun, B. Büchner, et al.
Applied Physics Letters