Abstract
We developed and experimented a method for obtaining a transverse flow CO<sub>2</sub> laser-TFL- with a matching coefficient (the cross section of the laser beam/the cross section of the electrical discharge) -(eta) <sub>m</sub> greater than 0.8 for a Fresnel number of the optical resonator -N<sub>F</sub>less than 2, in which both types of the active medium asymmetries are compensated. This corresponds to a TFL with high efficiency and TEM<sub>00/01</sub> good optical quality laser beam. The main elements for this laser are: gas circulation fluido-dynamical circuit in cylindrical geometry with two opposite electrical discharges; U-type laser resonator with a 90 degree deflection element (pentaprism alike), instead of one corner mirror, which reverse the wavefront of the laser beam in one of the two discharge channels. Also, it was developed a new very stable 90 degree-beam deflection optical element with properties alike pentaprism. This element might be used in optical resonator construction, transport and focusing systems of the laser beam.
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