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Schematic of the SD SH-OCT layout. The solid gray line represents the fundamental beam path, and the dotted black line represents the beam path for the secondharmonic light. Spectnω , spectrometer designed for the nth harmonic; DG, diffraction grating; Det, detector; OBJ, objective; NA, numerical aperture. Reproduced from (83). Copyright 2007 Optical Society of America.
