Abstract
“Negative” Faraday rotation, which is a direct consequence of negative absorption, is measured in He-Ne gas laser tubes at 3.39 μ and is used to derive reliable values of Doppler line width. This Faraday effect is used to produce beat frequencies in ring laser systems containing a quarter wave plate by inducing modes of oscillation which are, in general, elliptically polarised. Stable beat frequencies as large as 520 kHz per gauss are generated in a triangular laser having a 45 cm perimeter. The observed beat frequencies are compared with those predicted from the measured Faraday rotation for various elliptically polarised modes.
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