Abstract
An investigation was made of the spatial structure of the output radiation from static waveguide CO/sub 2/ lasers excited by a transverse rf field of 120 MHz frequency. The specific input energy was approx.2 W/cm. Measurements were made on circular waveguides having radii of 0.8--1.5 mm fabricated of BeO ceramic and glass and on a metal ceramic waveguide (Al+BeO) having a 2 x 2 mm cross section. It was established that in lasers with BeO waveguides and plane--plane resonators lasing is achieved in the HE/sub 11/ mode or in a superposition of the TE/sub 01/ and HE/sub 21/ modes. The lasing power in the HE/sub 11/ mode was 1.4--2 times higher than that in the superposed modes. The laser with the square waveguide emitted hybrid HE/sub n/m modes. A homogeneous distribution of the unsaturated gain over the cross section of the transverse rf discharge promoted excitation of higher-order modes.
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