Diffraction of a focused x-ray beam from La3Ga5SiO14 crystal modulated by surface acoustic waves

X-ray Bragg diffraction on an acoustically modulated La3Ga5SiO14 crystal (langasite, LGS) was studied in the saggital geometry where a surface acoustic wave (SAW) serves as diffraction grating of normal incidence. A set of parabolic compound Be refracting lenses was used to focus x-ray radiation in order to obtain good angular and spatial resolution of diffraction satellites. X-ray diffraction spectra analysis provided information on the acoustic properties of the LGS crystal and enabled the determination of SAW amplitudes and wavelengths.

[1]  M. P. da Cunha,et al.  Investigation on recent quartz-like materials for SAW applications , 1999 .

[2]  L. Solie,et al.  Optimal cuts of langasite, La/sub 3/Ga/sub 5/SiO/sub 14/ for SAW devices , 2001, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[3]  D. Roshchupkin,et al.  X-ray topography analysis of acoustic wave fields in the SAW-resonator structures , 2005, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[4]  R. Tucoulou,et al.  X-ray Bragg diffraction from langasite crystal modulated by surface acoustic wave , 2003 .

[5]  B. Lengeler,et al.  A microscope for hard x rays based on parabolic compound refractive lenses , 1999 .

[6]  A. Erko,et al.  X-ray diffraction analysis of the surface acoustic wave propagation in langatate crystal , 2009 .

[7]  M. Brunel,et al.  Scanning electron microscopy observation of surface acoustic wave propagation in the LiNbO/sub 3/ crystals with regular domain structures , 1994, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[8]  T. Karaki,et al.  Surface Acoustic Wave Properties of La3Ta0.5Ga5.5O14 Single Crystals , 2000 .

[9]  H. Fröhlich,et al.  Czochralski growth and characterization of piezoelectric single crystals with langasite structure: La3Ga5SiO14 (LGS), La3Ga5.5Nb0.5O14 (LGN) and La3Ga5.5Ta0.5O14 (LGT) II. Piezoelectric and elastic properties , 2000 .

[10]  O. Mathon,et al.  X-ray Bragg diffraction of LiNbO 3 crystals excited by surface acoustic waves , 2001 .