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CO, laser scattering from plasma density perturbations which are not wave-like in nature moving through the beam is calculated for various geometries and scale-lengths. Exact expressions are found for the heterodyne detector currents as a function of time, and for the corresponding frequency spectra. In particular, the cases of small-scale rotating density perturbations in cylindrical plasmas and off-axis rotation of the entire plasma column are analyzed in detail. By way of illustration, thedoi:10.1088/0032-1028/25/10/005 fatcat:q75cdnwsz5ejndvaiwummtts5y