= Extreme ultraviolet
<Extreme ultraviolet> denotes short-wavelength <ultraviolet> between longer-wavelength <ultraviolet> and <X-rays>; precise band boundaries depend on convention. Its <photons> have sufficient <energy> to cause strong <optical absorption> in many materials that transmit visible <light>.
This makes beam transport an apparatus problem: an ordinary air path or visible-light window can absorb the beam, and suitable reflective optics can be more useful than an ordinary transmitting <optical lens>. Before interpreting a weak detector signal, compare a blocked-beam reading with the open-beam reading and account for wavelength-dependent detector <quantum efficiency>.
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