Measurements of transverse-gain profiles in rf- and dc-excited CO2 gain cavities

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Abstract
Spatially resolved transverse‐gain profile measurements have been made in rf‐ and dc‐excited waveguidelike cavities for CO2 laser gas mixtures. Both current density and gas temperature impact the CO2 gain profile. As measured, transversely rf‐excited cavities show higher CO2 gain near the wall boundaries when compared to longitudinally dc‐excited cavities. We propose that transverse‐rf excitation may be inherently better than dc‐longitudinal excitation in producing a higher average spatial gain, owing to more uniform current density pumping.

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