The normal-incidence reflectance of ion-beam-deposited boron carbide t
hin films has been evaluated in the extreme ultraviolet (EUV) spectral
region. High-reflectance coatings have been produced with reflectance
s greater than 30% between 67 and 121.6 nm. This high reflectance make
s ion-beam-deposited boron carbide an attractive coating for EUV appli
cations.