By Byron B. Brenden (auth.), Glen Wade (eds.)
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Extra resources for Acoustic Imaging: Cameras, Microscopes, Phased Arrays, and Holographic Systems
SU-15, pp. 157-161, July 1968.  A. Korpel, "Visualization of the cross-section of a sound beam by Bragg-diffraction of light," Appl. Phys. , Vol. 9, pp. 425-427, Dec. 1966.  H. V. Hance, J. K. Parks and C. S. Tsai, "Optical imaging of a complex ultrasonic field by diffraction of a laser beam," J. Appl. , Vol. 4, pp. 1981-1983, March 1967.  G. Wade, J. Landry, and A. A. deSouza, "Acoustic transparencies for optical imaging and ultrasonic diffraction," paper at the First International Symposium on Acoustical Holography, December 1967.
In the third * The ideas involved were independently thought of by Hance, Parks, and Tsai  at Lockheed Research Laboratories, and by the present author  at UCSB. Research efforts similar to Korpel's at Zenith were mounted at about the same time by these workers. HISTORICAL PERSPECTIVES 39 place, a masking stop is inserted in the system (see the above-mentioned figure) to prevent unwanted light from interfering with the image. The techniques employed in Bragg-diffraction systems are sufficiently different from those used in the more clearly holographic systems that many workers in the field of acoustic imaging do not regard Bragg-diffraction systems as being holographic at all.
The wave fronts from the reference and object beams undergo reflection at the liquid-air interface above the membrane shown in the picture. This reflection produces radiation pressure on the liquid surface. The pressure causes the surface to deform until gravity and surface tension achieve a new balance. The deformation shows up as a stationary ripple pattern corresponding to the interference between the two beams. The ripples can be used directly to produce spatially modulated, first-order diffraction side bands on Fig.