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Schematics of long-range optical coherence tomography (OCT) system (A) and cross-section of the distal cap of a 0.7-mm outer diameter scanning probe (B). AOM = acoustooptic modulator; BD = balance detector; Circ = circulator; Coup = coupler; GRIN = gradient refractive index; M = mirror; PC = polarization controller; S/S = swept source.
