Distributed curvature crystal lens and X-ray reflectance measurement device

Realization of a distributed curvature crystal lens with high light focusing accuracy!
Able to increase X-ray intensity and realize compact device with long life!

Overview

　In a conventional X-ray monochromator, the spectroscopic crystal is elastically bent slightly, then polished to obtain a uniform diffraction. However, this method where the crystal is deformed within the elastic limit, cannot be applied for a large curvature bending, so it can only be used for a big X-ray device. Moreover, there is also an issue on the deformation stability and aging due to keeping the crystal deformed.　
　This invention is able to realize a distributed curvature crystal lens with a wide incident angle and high light focusing accuracy. This distributed curvature crystal lens is made by plastic deformation of Ge or Si (110) single crystal plate pressed by a mold at high temperature. The X-ray reflectance measurement system of this invention is equipped with above lens which enables to focus a wide angle and significantly increase X-ray intensity.

Able to obtain good uniformity of integrated reflection intensity and full width at half max. 

Product Application

・Distributed curvature crystal lens used for X-ray diffraction, etc.　
・Analysis and inspection device such as CT, EPMA, XRF, XRD, XPS, XRC, XRR, etc.
・X-ray telescope, satellite, etc.
・Medical field

Related Works

[1] K. Nakajima, K. Fujiwara, W. Pan, and H. Okuda, Nature Mater. 4, 47-50 (2005).
[2] H. Okuda, K. Nakajima, K. Fujiwara, and S. Ochiai, J. Appl. Cryst. 39, 443-445 (2006).
[3] H. Hiraka, K. Fujiwara, K. Yamada, K. Morishita, and K. Nakajima, Nuclear Instruments and Methods in Physics Research A 635, 137-140 (2011).
[4] H. Okuda, K. Morishita, K. Nakajima, K. Fujiwara, I. Yonenaga, and S. Ochiai, Appl. Phys. Exp. 3, 046601 (2010).
[5] K. Hayashi, K. Nakajima, K. Fujiwara, and S. Nishikata, Review of Scientific Instruments 79, 033110 (2008).

IP Data

IP No.　 ： JP4973960
Inventor ： OKUDA Hiroshi, NAKASHIMA Kazuo, FUJIWARA Kozo
keyword ： Lens, Crystal, lens, Condenser lens, Silicon (Si), Germanium (Ge)