Abstract
A ring structure of the profile of a laser beam, observed in a wide-aperture unstable resonator, appeared due to reflection of the intracavity beam from the discharge channel walls. The geometric-optics approximation was used to develop a model which was in agreement with the experimental results, including the divergence and the ring propagation angles. Detailed investigations were made of near-concentric and confocal unstable resonators. The eigenmodes corresponding to the formation of a closed path by the beam in one and two round trips through the resonator were recorded. In the waveguide regime the output power in the form of blue—green Ar+ lines was ~5 W.
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