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Schematics of the propagation of the terahertz wave packet when the pump pulse arrives at (A) t = τ 1 and (B) t = τ 2. (C) Power ratios of the frequency converted components for input frequencies of 0.35, 0.42, and 0.48 THz. The open circles and solid lines indicate the experimental results and fitting curves in the form of A exp[−α(−Δz)], respectively.
