In this erratum Fig. 3 of Opt. Lett. 44, 1011 (2019) [CrossRef] has been updated. A diagnostic method for the electron plasma density and temperature based on the exploitation of wide-band THz pulses is presented. The model accompanying the diagnostic method is described and it is shown useful to characterize the plasma density and temperature profile along a symmetry axis. This diagnostic is particularly interesting for plasma-acceleration schemes or laser-produced plasma channels.
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