|START||NEW VOL 20||SEARCH||STATISTICS||PAS - GDANSK DIVISION|
pp. 17-24, vol. 7, 2004
R. J. Bukowski
Institute of Physics, Silesian University of Technology, Gliwice, Poland
Abstract: In this work there is presented a description of the gaussian light beam diffraction on the planar ultrasound wave in the Raman-Nath region by the complex optical rays method. The case of the perpendicular light beam incidence (i.e. its axis) relatively to the direction of propagation of the ultrasound beam of ∆z width propagated in water (liquid) was considered. The light beam phase change and deflection contributions to the diffraction pattern was taken into account. Final analytical formulae gives a possibility analyze the influence of such parameters as: a size and position of the gaussian beam waist, a laser-screen (detector) distance, a position of the ultrasound beam and Raman-Nath parameter value on diffraction pattern. It has been proved that in some cases the diffraction beams have a fine structure.
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