Fig. 1.

System configuration of dermoscopy guided MF-OCT. Bessel beam illumination and Gaussian beam detection paths for dark-field effect are depicted in gray and red colors, respectively. PDU: passive delay unit, PC: polarization controller, FBG: fiber Bragg grating, CM: collimator, CIR: fiber circulator, FC: fiber coupler, PD: photodetector, PDD: polarization diverse detection, M: mirror, SM: scanning mirror, RAM: right angle mirror, DM: dichroic mirror, L1-L4: achromatic lens (f = 60 mm), L5-L7: achromatic lens (f = 75 mm).