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(a) Experimental setup. The first type-I β-BBO crystal was used to generate dual-color pulses, and the second one was used to produce another second-harmonic wave. α-BBO crystal was placed to compensate the dual-color phase difference, and the QW was quartz wedges to modulate the relative phase between the FW and SH pulses. (b) The devices were used to measure the phase difference of the dual-color pulse. (1)and (2) show the stimulated results for the cases that the two SH waves have 0 and π phase difference, respectively. (c) Eω (E2 ω ) and EL denote FW (SH) and the asymmetric electric field, Ex and Ey refer to the asymmetric electric field along x- and y-axes, respectively.
(a) The THz intensity of x-(red) and y-component (blue) and (b) the total THz intensity as a function of the phase difference of the orthogonally polarized dual-color pulses.
The THz intensity as a function of phase difference between the parallel polarized FW and SH components.
(a) THz polarization rotated along with the dual-color phase difference. (b) THz polarization rotated as the phase difference between y- and x-components of the THz electric field varied from 0 to π, and (c) from π to 2π.
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