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We demonstrate terahertz (THz) coherent detection using ethanol and ethanol-water mixtures. Combined with the THz-induced second harmonic (TISH) radiated from the liquid plasma and the control second harmonic (CSH) generated by BBO crystal, when the polarization directions of the CSH and TISH beams are parallel, a measured time-resolved waveform of the THz field is obtained due to the four-wave mixing mechanism. Since the third-order nonlinear coefficient of ethanol is larger than that of pure water, our scheme further enhances the sensitivity and signal-to-noise ratio of coherent detection. Meanwhile, the amplitude of THz wave detected by ethanol-water mixtures were increased with the increase of the ethanol concentration. This work provides a new perspective for exploring the solute-solvent molecular interaction and lays an experimental foundation for the theoretical analysis of THz wave coherent detection of classical liquid containing hydrogen bonds.
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