Abstract
A simple method was applied to select a fundamental transverse electro-magnetic mode (TEM)00 and a combination of TEM00+TEM10 modes using changeable cylindrical apertures inside the cavity close to the resonator mirrors. The experiment was carried out on a continuous wave CO2 laser, with an internal resonator 3.6 m long and 2.4 cm in diameter. The experimental results were compared with some calculations, and reasonable agreement was observed.
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