| http://www.w3.org/ns/prov#value | - The optical head 128, in one embodiment, includes substantially all components or devices which control or affect the laser or optical beam along its entire path from generation to arrival and/or reflection from the media 118 and detection, including the laser or other light source, lenses, gratings, holograms, wave plates, mirrors, beam splitters and other refractive, reflective, diffractive or o
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