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Observation of sagittal X‐ray diffraction by surface acoustic waves in Bragg geometry
Author(s) -
Vadilonga Simone,
Zizak Ivo,
Roshchupkin Dmitry,
Evgenii Emelin,
Petsiuk Andrei,
Leitenberger Wolfram,
Erko Alexei
Publication year - 2017
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576717002977
Subject(s) - diffraction , bragg's law , optics , diffraction topography , wavelength , acousto optics , acoustic wave , dynamical theory of diffraction , materials science , synchrotron radiation , rayleigh wave , physics , surface acoustic wave , acoustic space , diffraction grating , surface wave
X‐ray Bragg diffraction in sagittal geometry on a Y‐cut langasite crystal (La 3 Ga 5 SiO 14 ) modulated by Λ = 3 µm Rayleigh surface acoustic waves was studied at the BESSY II synchrotron radiation facility. Owing to the crystal lattice modulation by the surface acoustic wave diffraction, satellites appear. Their intensity and angular separation depend on the amplitude and wavelength of the ultrasonic superlattice. Experimental results are compared with the corresponding theoretical model that exploits the kinematical diffraction theory. This experiment shows that the propagation of the surface acoustic waves creates a dynamical diffraction grating on the crystal surface, and this can be used for space–time modulation of an X‐ray beam.