Abstract

Extreme ultraviolet (EUV) lasers in the wavelength range of ∼ 10 to 20 nm have matured to a point where dedicated applications such as at-wavelength inspection of extreme-ultraviolet lithography (EUVL) masks become possible on the laboratory scale. The authors briefly review the principles of plasma-based EUV lasers, the progress made so far, and the output characteristics of interest to the EUVL community.

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