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Coherence length, , vs pump wavelength, . The inset shows the image of the GaP stack with the crystal orientations that we used.
Experimental setup for THz-wave generation. The inset shows the spectra of the two pump lights generated from OPOs.
Output power, , dependence on frequency difference, , between two pump-light frequencies, and .
Output power, , dependence on the product of pump powers, when . The inset shows the output power dependence on the angle of a wire-grid polarizer. At , the wires of the polarizer are perpendicular to ⟨111⟩.
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