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(a) System schematic of BB-PAM. (b) in vivo mouse ear MAP images of GB-PAM (top) and BB-PAM (bottom). PAM, photoacoustic microscopy; BB-PAM, Bessel beam PAM; GB-PAM; Gaussian beam PAM; L, lens; AX, axicon lens; OL, objective lens; M, mirror; CL, collimator; SMF, single mode fiber; and AMP, amplifier. Reproduced with permission from Ref. [47].
