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(a) Schematic diagram of the OR-AR-PAM system. L1, concave lens; L2, convex lens; NDF, neutral density filter; FC, fiber coupler; UST, ultrasound transducer; OL, objective lens; MMF, multimode fiber; DAQ, data acquisition; L3 and L4, achromatic doublet; CL, correction lens; AL, acoustic lens. (b) Triggering sequence. (c) Data acquisition sequence in a single B-scan.
