Abstract
The characteristics of the laser radiation emitted from a long pulse, electron beam sustained CO 2 laser employing a retroreflective mirror resonator have been studied. The minimum beam divergence is found to be determined by the retroreflective array imperfections. The effect of tilting both the output window and the array is studied and examination of the temporal behaviour of the laser output to determine both mode structure and the effect of the Laser Induced Medium Perturbation (LIMP) is reported for the first time.
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