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Schematic of G2 OR-PAM. The solid-boundary inset shows the configuration of the acoustic-optical combiner in G1 OR-PAM. ConL: condenser lens; ND: neutral density; FC: fiber collimator; SMF: single-mode fiber; CCD: charge-coupled device; BS: beam splitter; PD: photodiode; CorL: correction lens; RAP: right-angle prism; SO: silicone oil; RhP: rhomboid prism; US: ultrasonic transducer.
