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An experimental setup for the DFG by mixing the weak THz and strong near-infrared laser beams. An off-axis parabolic mirror was used to focus the input signal to a crystal. A Nd:YAG laser used as a strong near-infrared beam passed through a hole drilled through the parabolic mirror while it was focused by a lens. The un-converted near-infrared beam was blocked by a Glan polarizer and a Raman laser filter. The output signal was focused to a mini monochromator by a lens. The output signal was then measured by using a detector near .
The angle-tuning curves for the DFG, measured by an photodiode: filled dots — the output signal wavelength vs the external incident angle; open circles — the wavelength for the input signal vs the external incident angle. Solid lines — our theoretical results.
The output signal power vs. the input signal wavelength, which was measured by using the photodiode.
A temporal profile of the output signal, at the wavelength of (the corresponding wavelength for the input signal is ) which was measured by the PMT.
The output signal power vs the input signal power at the wavelength of , which was measured by using (a) the PMT and (b) the photodiode. The two solid lines correspond to the linear least-square-root fits to the data.
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