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A schematic of the experimental setup. The transducer was held confocal to the microscope objective using a custom machined bracket. Acoustic pulse length and power was modulated from a HP 3314A function generator. Timing between the transducer, amplifier gate, ultra-high speed camera, and flash lamp was accomplished using a laptop equipped with an external controller running SIM Control (Specialised Imaging Ltd., Hertfordshire, UK).
