High-efficiency collector design for extreme-ultraviolet and x-ray applications.
A design of a two-reflection mirror for nested grazing-incidence optics is proposed in which maximum overall reflectivity is achieved by making the two grazing-incidence angles equal for each ray. The design is proposed mainly for application to nonimaging collector optics for extreme-ultraviolet microlithography where the radiation emitted from a hot plasma source needs to be collected and focused on the illuminator optics. For completeness, the design of a double- reflection mirror with equal reflection angles is also briefly outlined for the case of an object at infinity for possible use in x-ray applications.
Zocchi
Fabio E
FE
Media Lario Technologies, Località Pascolo, 23842 Bosisio Parini (LC), Italy. fabio.zocchi@media-lario.com