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Layout of the terahertz parametric generator.
Absorption spectrum due to two closely spaced water vapor lines at a pressure of . The dotted line shows the experimental data. The three additional curves illustrate calculated absorption profiles using HITRAN data and assuming FWHM source linewidths of 7, 5, and .
Self-frequency shift (terahertz) of the to rotational line in the fundamental band of carbon monoxide as a function of carbon monoxide pressure (bar), where is the center frequency (terahertz) of the absorption line. Error bars indicate the width of the frequency bins employed.
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