Fig. 3: Single-shot recording of free-propagating terahertz pulses over a window of the order of 20 ps.
From: Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording
a DEOS experimental setup. ZnTe: 1 mm-thick, 110-cut Zinc Telluride crystal, HWP: Half-wave plates, QWP: Quarter-wave plate, PBS: Wollaston polarizing cube beam-splitter. The beams emerging from the PBS are in the plane perpendicular to the figure. b Raw camera image containing the single-shot spectra of the two polarization outputs S1,2n, and the unmodulated laser spectrum S0n. c, d EO signals on two polarizations channels (after background subtraction and normalization, see “Materials and methods”. e Single-shot input signal retrieved from (c) and (d) using the DEOS phase-diversity-based algorithm (red). Green trace: actual input, obtained using scanned electro-optic sampling. Inset: Fourier spectra of the two terahertz signals. Note that the classical (i.e., single channel) spectral decoding method would just provide the deformed signals (c) or (d), depending on the channel used. More generally, a classical single-channel method would provide an input signal with good fidelity only if its bandwidth is small compared to the location of the first transfer function zero (dashed lines in the inset of (e)), or if the signal bandwidth is within one of the lobes in the frequency response in Fig. 2b.
