The design of front-end collimating optics for extreme-ultraviolet lit
hography (EUVL) is reported. For EUVL, collimating optics consisting o
f a concave toroidal mirror and a convex toroidal mirror can achieve s
horter optical path lengths than collimating optics consisting of two
concave toroidal mirrors. Collimating optics consisting of a concave t
oroidal mirror and a convex toroidal mirror are discussed. The design
of collimating optics for EUVL beamlines based on ray-tracing studies
is described.