Considerable improvement in the operating efficiency of a hybrid CO_2 laser has been achieved by increasing the TEM_00 mode filling factor in the TEA section. The usage of helium-free gas mixture in the TEA section restricted the width of the glow discharge to the central zone in the interelectrode region allowing the oscillating TEM_00 mode to experience a higher gain in the TEA section resulting in an improved performance of the laser.
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