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(a) Amplitudes of the main positive polar (squares) and the main negative polar (circles) of the terahertz field measured by spectral-encoding technique vs pump laser energy . (b) Typical terahertz waveforms when and . Their corresponding terahertz spectra are shown in the inset.
Simulation results of the amplitudes of the positive polar (squares) and the negative polar (circles) of the retrieved terahertz signal vs the modulation depth of the input terahertz field.
Simulation results of typical retrieved terahertz fields with different modulation depths of the input terahertz signal vs the original terahertz field (dashed line). All the retrieved terahertz fields are normalized to the original bipolar terahertz field. Terahertz fields in (a) and in (b) are in antiphase to each other.
Corresponding spectra of terahertz signals shown in Fig. 3 with different modulation depths of .
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