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Fig. 1 (a) The schematic of PAM imaging setup. BS, beamsplitter; PD, photodiode; NDF, neutral density filter; PCL, plano-convex lens; PH, pinhole; M, mirror; DL, doublet lens; SMF, single-mode fiber; NH, needle hydrophone; WT, water tank; DAC, data acquisition card. (b) Measured lateral resolution of 3.2?µm. (c) Measured axial resolution of 28.5?µm.
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