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The experimental arrangement for Coulomb field spectral upconversion and the definition of the crystal and reference frames. The probe input and Coulomb THz pulse propagate along the ZnTe direction, with polarization defined by the angles and with respect to the direction.
The measured and predicted upconverted Coulomb THz spectrum, together the spectrum observed without the Coulomb pulse. The probe laser reference spectrum and the Coulomb temporal profile are shown in the insets.
Top: measured spectra showing sidebands as a function of THz polarization . Bottom: sum-frequency (○) and difference-frequency (◻) sideband intensity as function of THz polarization, together with that predicted by frequency mixing (solid line).
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