| OBERTA, P., Petr MIKULÍK, M. KITTLER, J. HRDÝ and L. PEVERINI. Diffractive-refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces. Journal of Synchrotron Radiation. 2010, vol. 17, No 1, p. 36-40. ISSN 0909-0495. |
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@article{866746,
author = {Oberta, P. and Mikulík, Petr and Kittler, M. and Hrdý, J. and Peverini, L.},
article_number = {1},
keywords = {diffractive-refractive optics; aberration; parabolic groove; x-ray optics; x-ray diffraction},
language = {eng},
issn = {0909-0495},
journal = {Journal of Synchrotron Radiation},
title = {Diffractive-refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces},
url = {http://www3.interscience.wiley.com/journal/123238603/abstract},
volume = {17},
year = {2010}
}
TY - JOUR
ID - 866746
AU - Oberta, P. - Mikulík, Petr - Kittler, M. - Hrdý, J. - Peverini, L.
PY - 2010
TI - Diffractive-refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces
JF - Journal of Synchrotron Radiation
VL - 17
IS - 1
SP - 36-40
EP - 36-40
SN - 09090495
KW - diffractive-refractive optics
KW - aberration
KW - parabolic groove
KW - x-ray optics
KW - x-ray diffraction
UR - http://www3.interscience.wiley.com/journal/123238603/abstract
N2 - Based on analytical formulae calculations and ray-tracing simulations a low-aberration focal spot with a high demagnification ratio was predicted for a diffractive-refractive crystal optics device with parabolic surfaces. Two Si(111) crystals with two precise parabolic-shaped grooves have been prepared and arranged in a dispersive position (+,-,-,+) with high asymmetry. Experimental testing of the device at beamline BM05 at the ESRF provided a focal spot size of 38.25 um at a focal distance of 1.4 m for 7.31 keV. This is the first experiment with a parabolic-shaped groove; all previous experiments were performed with circular grooves which introduced extreme aberration broadening of the focal spot. The calculated and simulated focal size was 10.8 um at a distance of 1.1 m at 7.31 keV. It is assumed that the difference between the measured and calculated/simulated focal spot size and focal distance is due to insufficient surface quality and to alignment imperfection.
ER -
OBERTA, P., Petr MIKULÍK, M. KITTLER, J. HRDÝ and L. PEVERINI. Diffractive-refractive optics: low-aberration Bragg-case focusing by precise parabolic surfaces. \textit{Journal of Synchrotron Radiation}. 2010, vol.~17, No~1, p.~36-40. ISSN~0909-0495.
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