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Schematic of the distal end of a fiber-optic scanning nonlinear optical endomicroscope probe. The piezoelectric (PZT) tube, the double-clad fiber (DCF) cantilever, and the miniature objective lens were encased in a hypodermic housing tube with an overall outer diameter of 2.4 mm. The two pairs of electrodes on the PZT tube surface are marked and , with the corresponding electric wires colored black and red, respectively.
