ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06
3aPA13. Collinear ultrasonic four-wave mixing mediated by a suspension.
Christopher S. Kwiatkowski
Philip L. Marston
Dept. of Phys., Washington State Univ., Pullman, WA 99164-2814
In previous work, ultrasonic four-wave mixing mediated by a suspension was
observed by oblique Bragg reflection of a high-frequency probe wave from a
periodic grating [H. J. Simpson and P. L. Marston, 2244(A) (1991)].
The grating in the number density of suspended polymer microspheres was induced
by the radiation pressure of a standing pump wave. In the present
investigation, a different geometry is examined which has potential advantages
for the investigation of this class of mediated interactions of sound with
sound. The new geometry uses a high-frequency probe beam that is collinear with
the axis of the pump standing wave. The Bragg signal for this geometry is
amenable to analysis with transfer matrices. The interaction investigated has
potential applications to the acoustical probing of suspensions. [Work
supported by the Office of Naval Research.]