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Abstract
We present a single longitudinal mode (SLM) TEA CO2 laser oscillation by using a three-mirror resonator with a Fabry–Perot etalon. The etalon was inserted in the optical path taken out from the main resonator of the CO2 laser for protecting the etalon from damage on the surface. A modified numerical model of the three- mirror resonator was investigated for design the laser. SLM pulse from the TEA CO2 laser was achieved, and the experimentally measure values were found to have good agreement with the numerical model. The maximum pulse energy of reliable SLM emission is obtained in excess of 200 mJ at 9.57 μm. The reliability of producing SLM pulses was higher than 90%, and there was no damage on the etalon
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