Figure 2
From: In vivo sub-femtoliter resolution photoacoustic microscopy with higher frame rates
Experimental setup of 2PAM based on mechanical scanning.
The red arrows in the figure represent laser light paths, while the black arrows indicate electrical signal connections. M, mirror; TS, telescope; BS, non-polarizing beam-splitter; AOM, acousto-optic modulator; PD, photo detector; ND, neutral density wheel; O, objective lens; WC, water cavity; T, ultrasonic transducer; PreA1 and PreA2, amplifiers (PR5678 and PR5660B, Olympus) for pre-amplification; F1 and F2, electronic low-pass filters (BLP-15+ and BLP-1.9+, Minicircuit); Ref., reference signal in the electrical form; Sig., photoacoustic signals in the electrical form.
