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Schematic of optical coherence tomography (OCT) system design. SLED, super luminescent diode; PC, polarization controllers; P, dispersion compension prisms; VND, variable neutral density filter; M, reference mirror; G, dual galvanometer scanners; f, sample arm telescope lenses; O, objective; S, sample; VPHG, volume phase holographic grating; FT, F-theta lens; CCD, charge-coupled device line camera.
