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(a) Schematic of the chromatic confocal microscope. PCF: photonic crystal fiber supercontinuum source; CL: collimating lens; BS: beam splitter; L1, L2, L3, and L4: aspheric lenses; OL: objective lens; L5: detection lens; F1: detection fiber. Inset shows a generic chromatic focal shift for any beam focus within the lens system. (b) Reference spectrum of the supercontinuum source measured by the spectrometer through the optical system.
