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Schematic of the spectral / Fourier domain ultrahigh-resolution OCT systems. PC: polarization controller, DC: dispersion compensation glass, RM: reference mirror, GS: galvanometer scanner pair, DG: diffraction grating, SLD: superluminescent diode, CMOS: line scan camera. Fiber couplers of 70/30 and 80/20 were used for the first and second systems, respectively.
