Simultaneous photoacoustic and optically mediated ultrasound microscopy: phantom study

An experimental setup for combined photoacoustic (PA) and optically mediated ultrasound (US) microscopy is presented. A spherically focused 35 MHz polyvinylidene fluoride (PVDF) ultrasonic detector with a numerical aperture of 0.28, a focal distance of 9 mm, and a bandwidth (−6  dB−6  dB level) of 24 MHz was used to obtain PA and US data with a 3 mm imaging depth. A fiber-optic system was employed to deliver laser excitation pulses from a tunable laser to the studied medium. A single optical pulse was used to form both PA and US A-scans. The probing US pulses were generated thermoelastically due to absorption of backscattered laser radiation by the metalized surface of a PVDF film. FFF

Subochev P., Katichev A., Morozov A., Orlova A., Kamensky V., and  Turchin I. Simultaneous photoacoustic and optically mediated ultrasound microscopy: phantom study, Optics letters 37, 4606-4608 (2012).

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https://doi.org/10.1364/OL.37.004606