Fig. 1. Performance characterization of transparent ultrasonic transducer. (a) Physical image of 7 MHz LiBbO₃ transparent ultrasonic transducer; (b) light transmittance curves; (c) electrical impedance and phase angle; (d) pulse echo curve and spectrum

Fig. 2. Photoacoustic microscope system based on transparent ultrasonic transducer. (a) Structural diagram; (b) top view of image head

Fig. 3. Test of system resolution. (a) Photoacoustic image of blade sharp edge; (b) lateral resolution of system

Fig. 4. Images of simulated sample. (a) Optical diagram of carbon fiber filament; (b) photoacoustic image of carbon fiber filament; (c) photoacoustic image of leaf vein skeleton; (d) photoacoustic image of local lateral veins of leaf vein skeleton

Fig. 5. Images of mouse ear. (a) Optical image; (b) photoacoustic image