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Schematic diagram of the prototype TAUM system. f1 and f2 are the modulation frequency of the pump and probe, respectively, as induced by a dual frequency optical chopper. L1 and L2 form a beam expander to fill the aperture of the objective (b). The sample is placed in a water bath (c) for acoustic coupling. A 6 or 25 MHz center frequency ultrasonic transducer serves as the detector (d).
