| http://www.w3.org/ns/prov#value | - or and direct a second portion of each near-field signal beam and a second portion of the reference beam to interfere at the corresponding detectorelement for the second detector.The optics in the system can define a confocal imaging system.The optics can include a spatial filter positioned before the detector, the spatial filter including a pinhole aligned with the detector element, and imaging o
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