Wave-optical evaluation of interference fringes and wavefront phase in a hard-x-ray beam totally reflected by mirror optics.
The intensity flatness and wavefront shape in a coherent hard-x-ray beam totally reflected by flat mirrors that have surface bumps modeled by Gaussian functions were investigated by use of a wave-optical simulation code. Simulated results revealed the necessity for peak-to-valley height accuracy of better than 1 nm at a lateral resolution near 0.1 mm to remove high-contrast interference fringes and appreciable wavefront phase errors. Three mirrors that had different surface qualities were tested at the 1 km-long beam line at the SPring-8/Japan Synchrotron Radiation Research Institute. Interference fringes faded when the surface figure was corrected below the subnanometer level to a spatial resolution close to 0.1 mm, as indicated by the simulated results.
Yamauchi
Kazuto
K
Department of Precision Science and Technology, Graduate School of Engineering, Osaka University, Yamada-oka 2-1, Suita, Osaka 565-0871, Japan. yamauchi@prec.eng.osaka-u.ac.jp
Yamamura
Kazuya
K
Mimura
Hidekazu
H
Sano
Yasuhisa
Y
Saito
Akira
A
Endo
Katsuyoshi
K
Souvorov
Alexei
A
Yabashi
Makina
M
Tamasaku
Kenji
K
Ishikawa
Tetsuya
T
Mori
Yuzo
Y