Abstract:
The feasibility of reducing the angular divergence of the output radiation from a laser with an unstable resonator by conversion of the cross-sectional profile of the beam using conical optics is discussed. The results of experiments using a $CO_2$-laser are presented. These show that the use of a conical converter at the output of a laser with a low gain (having an unstable resonator with a magnification close to unity) should give an appreciable improvement in the directionality of the radiation.
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