Abstract
In this paper, the effect of stray or applied magnetic fields on the modes and polarization of the planar laser output is considered. For weak fields the splittings are small compared to the Doppler broadening of the Ne laser transition, but the polarizations, or labeling of the photons available in the Zeeman transitions, allow simultaneous oscillation in different modes at frequencies within the same natural linewidth of the Ne atoms in the vicinity of a given axial resonance. Strong low-frequency beats are observed and arise from a splitting of a single axial resonance into two oscillations with different polarizations, which are pulled towards the centers of the respective lines. Such low-frequency beats also give rise to a splitting of the 120-Mc/sec axial mode beats. The multiplicity of low-frequency beats observed, particularly for small magnetic fields and high power levels, is due to similar effects from a number of axial modes. At higher magnetic fields relaxation oscillations similar to those which occur in the ruby laser are in evidence.
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