Fig. 6: Results of rapid displacement and velocity measurements.
From: High-precision time-domain stereoscopic imaging with a femtosecond electro-optic comb
a Balanced signal versus target displacements (Δd). b Rapid imaging of two targets moving towards each other. c Trajectories at two selected imaging points. d Results of velocity measurements. e Balanced signals recorded at modulation frequencies of fm = 100 kHz and 1 MHz. For these measurements, the slow cameras are replaced by two fast photodetectors at 1 GHz bandwidth. In this case, the refresh rate of balanced signals is set by the fm. For the frequency modulation mode, the center fr of the EO comb is set at 165 MHz with a frequency deviation fixed at 250 kHz. Note that such a small fr tuning range negligibly impacts the comb pulse width.
