A detailed comparison of the performance of uniform and graded multilayers as soft x-ray monochromators and normal incidence collectors has been made. In particular, the responses of flat depth-, and laterally graded multilayers to Al Kα, radiation, λ = 8.34 Å have been computed and compared with the corresponding uniform multilayer. Furthermore, the efficiency of graded and uniform multilayers as normal incidence x-ray collectors has been calculated in terms of effective areas for parabolic reflectors tuned to the O Kα line, λ = 23.7 Å. Finally, the effective areas of four strong solar emission lines in the 30–60 Å region have been computed for uniform multilayers Normal incidence multilayer mirrors are well suited for spectroheliograph type of applications.
© 1983 Optical Society of America
Ping Lee, "Uniform and graded multilayers as x-ray optical elements," Appl. Opt. 22, 1241-1246 (1983)