X-Rays Beam Condensation by Confinement in a Thin Crystal

Abstract

We have observed condensation of X-rays emitted from an edge of a thin Ge parallel crystal, using X-rays from synchrotron radiation. When highly parallel X-rays with the energy near an absorption edge of an atom or a nucleus are incident on a thin crystal in the Bragg case, a part of X-rays is confined in the crystal and do not come out either from the top or the bottom surface. The density of confined beam increases as the width of the incident beam is increased. The confined beam can come out from an edge of a thin crystal with higher density than the incident beam.

X-ray interference fringes from a weakly bent plane-parallel crystal with negative strain gradient

“…If the crystal is small along the incident azimuth direction (x) compared with the propagation length of the X-ray, interference fringes can be observed in the emitted beams from the lateral surface both in the diffracted-(IFLSD) and the transmitted-wave directions (IFLST). Both IFLSD and IFLST have been observed by Fukamachi et al (2004Fukamachi et al ( , 2005) from a thin Ge plane-parallel crystal. These fringes were formed by interference between the beams directly propagating to the lateral surface (S 3 ) and once reflected from the back surface (S 4 ) (Hirano et al, 2008(Hirano et al, , 2009a.…”

Artificial Temperature Anisotropy of Crystals in X-Ray Frequency Range

“…The rocking curves of beams reflected on the surface and emerging from the end face of crystal were obtained. The BB m L diffraction in thin crystal was investigated in [13][14][15] with the help of Synchrotron Radiation and the BL diffraction was investigated in [16]. In [8][9][10][11][12] the BL diffraction has been investigated in the presence of external influences (temperature gradient, ultrasound).…”

Ultrasound artificial anisotropy of crystals in x-ray frequency range

“…It is assumed that under the action of temperature gradient the isotropic crystal optically becomes artificially anisotropic similar to a uniaxial crystal with an optical axis along the direction of applied external influence serving as a symmetry axis. The BB m L diffraction in thin crystal was investigated in [13][14][15] with the help of Synchrotron Radiation and the BL diffraction was investigated in [16] . In the present work the effect of an external influence (ultrasound) on Bragg diffracted energy flow has been experimentally investigated.…”