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(a) Design schematic of the robust OCT imaging needle. The fiber-optic GRIN lens and microreflector were encased in a small glass tube and then assembled in a hypodermic tube. (b) Spot size and working distance as a function of the pitch number of the GRIN fiber lens with a spacer of 450 μm long. The simulation is based on ABCD matrix calculation. The dashed lines on the plots indicate our target parameters.
