title: Comparison of Mg-based multilayers for solar He II radiation at 30.4 nm wavelength.
abstract: Mg-based multilayers, including SiC/Mg, Co/Mg, B(4)C/Mg, and Si/Mg, are investigated for solar imaging and a He II calibration lamp at a 30.4 nm wavelength. These multilayers were fabricated by a magnetron sputtering method and characterized by x-ray reflection. The reflectivities of these multilayers were measured by synchrotron radiation. Near-normal-incidence reflectivities of Co/Mg and SiC/Mg multilayer mirrors are as high as 40.3% and 44.6%, respectively, while those of B(4)C/Mg and Si/Mg mirrors are too low for application. The measured results suggest that SiC/Mg, Co/Mg multilayers are promising for a 30.4 nm wavelength.
authors.affiliation: Institute of Precision Optical Engineering, Department of Physics, Tongji University, Shanghai 200092, China.
authors.forename: Jingtao
authors.initials: J
authors.lastname: Zhu
authors.forename: Sika
authors.initials: S
authors.lastname: Zhou
authors.forename: Haochuan
authors.initials: H
authors.lastname: Li
authors.forename: Qiushi
authors.initials: Q
authors.lastname: Huang
authors.forename: Zhanshan
authors.initials: Z
authors.lastname: Wang
authors.forename: Karine
authors.initials: K
authors.lastname: Le Guen
authors.forename: Min-Hui
authors.initials: MH
authors.lastname: Hu
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: André
authors.forename: Philippe
authors.initials: P
authors.lastname: Jonnard