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Light diffraction by two parallel superposed ultrasonic waves of the frequency ratio 1:2.

Gondek G, Grulkowski I, Kwiek P, Reibold R

Institute of Experimental Physics, Uniwersytet Gdanski, Gdansk, Poland.

The paper constitutes a concise study of light diffraction by two superposed ultrasonic waves of the frequency ratio 1:2, beyond the Raman-Nath diffraction regime. Relevant numerical simulations of light intensity distribution within separate diffraction orders are shown based on the Nth order approximation method (NOA). A comparison is given between generalized theoretical predictions (N=7) and simplified formulas of Mertens (N=2) [R. Mertens, Diffraction of light by two parallel superposed supersonic waves, one being the nth harmonic of the other: A critical study of the methods leading to approximate solutions in finite form, Proc. Indian Acad. Sci. 55 (1962) 63-98.]. Moreover, the results of the performed experiment are presented which indicate limited applicability range of Mertens' pioneer description of 1962.

Published 2 May 2007 in Ultrasonics, 46(2): 133-7.
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