Open AccessON THE BRAGG-DIFFRACTION OF SURFACE ACOUSTIC WAVES BY ACOUSTIC GRATING
Author(s) -
Wang Zou-Qing,
Shifeng Zhou,
Cheng-Hao Wang
Publication year - 1983
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.32.156
Subject(s) - diffraction , optics , grating , acoustic wave , deflection (physics) , schlieren , acousto optics , materials science , surface acoustic wave , diffraction efficiency , ultrasonic grating , bragg's law , schlieren imaging , fiber bragg grating , blazed grating , diffraction grating , acoustics , physics , wavelength
The surface acoustic wave diffraction phenomena on acoustic gratings in Bragg regime have been explored.The modal approach has been used to treat this problem under strong Bragg condition. Some results, including the eigen-modes in the grating, the equation of the deflected angles, and the analytical expression of deflection efficiency which depends on the operation frequency and the grating parameters, have been obtained.Experimentally, the image of the diffraction acoustic fields on acoustic grating which was composed of some aluminium film stripes on y-cut LiNbO3 crystals have been visualized by means of Schlieren method. Some excellent photographs of diffraction fields have been obtained, and the deflection angles and deflection efficiency at different frequency have been measured by using optical method. The comparison between the theoretical and the experimental results shows that the agreement is satisfactory.