A new homodyne spectroscopy technique [T. Tsukishima and O. Asada, Jpn. J. Appl. Phys. 17, 2059 (1978)] has been applied to tokamak microturbulence measurements in order to resolve the frequency spectra and wave propagation direction of low-frequency density fluctuations. Application of this method provides a high-resolution, inexpensive, and easily implemented alternative to the more technically demanding heterodyne detection schemes typically available. Comparison of heterodyne and the new homodyne spectroscopy results will be made.
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Brower et al. (1986) studied this question.
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