title: Light diffraction by two parallel superposed ultrasonic waves of the frequency ratio 1:2.
abstract: 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.
authors.affiliation: Institute of Experimental Physics, Uniwersytet Gdanski, Gdansk, Poland.
authors.forename: G
authors.initials: G
authors.lastname: Gondek
authors.forename: I
authors.initials: I
authors.lastname: Grulkowski
authors.forename: P
authors.initials: P
authors.lastname: Kwiek
authors.forename: R
authors.initials: R
authors.lastname: Reibold
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008027:Light; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D014463:Ultrasonography / Q000379:methods*