| http://www.w3.org/ns/prov#value | - As a laser capable of emitting such a laser beam, any of the following lasers can be used: an excimer laser such as a KrF, ArF, or XeCl laser; a gas laser such as a He, He???Cd, Ar, He???Ne, HF, or CO2 laser; a solid-state laser such as a crystal laser using crystals such as YAG, GdVO4, YVO4, YLF, or YAlO3 which are doped with Cr, Nd, Er, Ho, Ce, Co, Ti, or Tm, a glass laser, or a ruby laser; or a
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