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Photomixing of two near-infrared lasers is well established forcontinuous-wave terahertz spectroscopy. Photomixing of three lasers allows usto measure at three terahertz frequencies simultaneously. Similar to Fourierspectroscopy, the spectral information is contained in an nterferogram, whichis equivalent to the waveform in time-domain spectroscopy. We use one fixedterahertz frequency \nu_ref to monitor temporal drifts of the setup, i.e., ofthe optical path-length difference. The other two frequencies are scanned forbroadband high-resolution spectroscopy. The frequency dependence of the phaseis obtained with high accuracy by normalizing it to the data obtained at\nu_ref, which eliminates drifts of the optical path-length difference. Weachieve an accuracy of about 1-2 microns or 10^{-8} of the optical path length.This method is particularly suitable for applications in nonideal environmentalconditions outside of an air-conditioned laboratory.

Self-normalizing phase measurement in multimode terahertz spectroscopy based on photomixing of three lasers