Design of Elliptical Reflection Zone Plate for Monochromatization of the Ultrafast Betatron Radiation at Low Energy Band  

作　　者：杨祖华 赵宗清 魏来 张强强 钱凤 谷渝秋 曹磊峰 

机构地区：[1]Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900

出　　处：《Chinese Physics Letters》2014年第5期22-25,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 1137516, and the Science Foundation of China Academy of Engineering Physics under Grant Nos 2009A0102003 and 2011B0102021.

摘　　要：The elliptical reflection zone plate is a kind of optical element in soft x-ray and x-ray ranges and has focusing and dispersion properties. Compared with a transmission zone plate, the required dispersion ordei, can be easily separated from zeroth order diffraction. It is fabricated on a bulk substrate and does not have much difficulty in the fabrication process. We design a 1000-zone off-axis elliptical reflection zone plate for the rnonochromatization of the ultrafast betatron radiation at the low energy band, at the designed wavelength of 2.478 nm （500eV） which is an important spectral part of the betatron radiation, with high spatial resolution, high spectral resolution. Moreover, we simulate the designed reflection zone plate properties. The simulation results show that the spatial resolutions in the spatial direction and the spectral direction are 6.4μm and 7.3μm （full width half maximum）, respectively,, and the spectral resolution reaches up to 496 for the well aligned point source system, which is in good agreement with the theoretical predictions. In addition, we discuss some factors influencing the spectral and spatial resolution, such as the zone number, zone area and the incidence wavelength. The elliptical reflection zone plate also has potential applications in investigating x-ray fluorescence spectra and other fields.The elliptical reflection zone plate is a kind of optical element in soft x-ray and x-ray ranges and has focusing and dispersion properties. Compared with a transmission zone plate, the required dispersion ordei, can be easily separated from zeroth order diffraction. It is fabricated on a bulk substrate and does not have much difficulty in the fabrication process. We design a 1000-zone off-axis elliptical reflection zone plate for the rnonochromatization of the ultrafast betatron radiation at the low energy band, at the designed wavelength of 2.478 nm （500eV） which is an important spectral part of the betatron radiation, with high spatial resolution, high spectral resolution. Moreover, we simulate the designed reflection zone plate properties. The simulation results show that the spatial resolutions in the spatial direction and the spectral direction are 6.4μm and 7.3μm （full width half maximum）, respectively,, and the spectral resolution reaches up to 496 for the well aligned point source system, which is in good agreement with the theoretical predictions. In addition, we discuss some factors influencing the spectral and spatial resolution, such as the zone number, zone area and the incidence wavelength. The elliptical reflection zone plate also has potential applications in investigating x-ray fluorescence spectra and other fields.

分 类 号：O435.1[机械工程—光学工程] TL541.033[理学—光学]