Abstract
The Faraday mode-splitting, or self-heterodyne, technique has been used to measure electron density along the optical axis of the HCN laser (337 microm). The measurement indicates an afterglow electron density of 4.5 x 10(11) cm(-3); this result agrees with microwave measurements made across the laser axis. The sensitivity of the measurement is about 2 orders of magnitude better than an interferometric measurement at the same wavelength. The technique is easy to instrument, but care is required to interpret the results in the present application. The gain of the HCN laser is probably sufficient to permit use of this technique, in some cases, to measure the density of an external plasma.
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