Narrow resonances of polarization characteristics of gas lasers in magnetic fields and their use in high-resolution spectroscopy

An investigation was made of the competition between two frequencies of radiation with orthogonal circular polarization. Each of these frequencies was generated as one of the σ components in the gain band. This competition produced narrow (much narrower than the homogeneous width of the gain band) resonances of the output radiation power. Isotopic shifts of the λ = 1.161 and 1.198 μ lines of Ne²⁰ and Ne²² were determined.