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(a) Experimental setup. Pump and probe laser pulses are directed into a scanning microscope. The detection end measures the modulation on the probe. (b) Image acquired with no delay between the pump and probe pulses. (c) Image of same slide with probe delay changed, for example, to 300 femtoseconds. The full response of the specimen is sampled by acquiring a range of probe delays, up to 16 picoseconds.
