Performance of a polarizer using synthetic mica crystal in the 12–25 nm wavelength range  

作　　者：崔明启 陈凯 赵佳 孙立娟 席识博 嫣芬 

机构地区：[1]Institute of High Energy Physics, Chinese Academy of Sciences [2]School of Mechanical Engineering, Beijing Technology and Business University

出　　处：《Chinese Physics C》2011年第5期509-513,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10275078, 10435050)

摘　　要：To develop polarizer functioning in the extreme ultraviolet （EUV） and soft X-ray region, the polarization performance of synthetic mica has been investigated theoretically with a simulation code using Fresnel equations and optical constants from the Henke database. The reflectance of synthetic mica crystal for s and p polarization was measured to investigate its polarization performance in a home-made synchrotron radiation soft X-ray polarimeter at beamline 3W1B, Beijing Synchrotron Radiation Facility （BSRF）. The reflectivity of the synthetic mica crystal at an angle of grazing incidence of 48° was obtained from the experimental data, which is about 4.8 × 10-3 at 25 nm and 6.0 × 10-4 at 12 nm, and the linear polarizance of the X-ray reflected by the synthetic mica crystal that we measured using an analyzer-rotating method increases from 80% to 96.6% in this EUV region, while higher than 98.2% in the simulation. The result indicates that this synthetic mica crystal works as a practical polarizer in this EUV region of 12-25 nm, and also in an extensive wavelength region higher than 25 nm.To develop polarizer functioning in the extreme ultraviolet （EUV） and soft X-ray region, the polarization performance of synthetic mica has been investigated theoretically with a simulation code using Fresnel equations and optical constants from the Henke database. The reflectance of synthetic mica crystal for s and p polarization was measured to investigate its polarization performance in a home-made synchrotron radiation soft X-ray polarimeter at beamline 3W1B, Beijing Synchrotron Radiation Facility （BSRF）. The reflectivity of the synthetic mica crystal at an angle of grazing incidence of 48° was obtained from the experimental data, which is about 4.8 × 10-3 at 25 nm and 6.0 × 10-4 at 12 nm, and the linear polarizance of the X-ray reflected by the synthetic mica crystal that we measured using an analyzer-rotating method increases from 80% to 96.6% in this EUV region, while higher than 98.2% in the simulation. The result indicates that this synthetic mica crystal works as a practical polarizer in this EUV region of 12-25 nm, and also in an extensive wavelength region higher than 25 nm.

关 键 词：synchrotron radiation EUV synthetic mica polarization 

分 类 号：O434.11[机械工程—光学工程]