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Observation of difference-frequency generation by mixing of terahertz and near-infrared laser beams in a crystal
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View: Figures


Image of FIG. 1.
FIG. 1.

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 .

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

The output signal power vs. the input signal wavelength, which was measured by using the photodiode.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Observation of difference-frequency generation by mixing of terahertz and near-infrared laser beams in a GaSe crystal