Abstract

The design and the use of positive branch unstable resonators with variable reflectivity mirrors are described in the case of two different transverse flow CO, lasers: a TEA source for LIDAR Doppler applications and a high average power DC excited source for industrial applications. In the first case, Ge and ZnSe mirrors with Gaussian and super-Gaussian reflectivity profiles have been employed. In the second one, ZnSe mirrors with Gaussian and super-Gaussian reflectivity profiles have been employed as well as partial hard-edge reflectivity mirrors with and without phase compensation. Beams with 40 mm diameter and full-angle divergence of about 1 mrad were typically obtained in both cases. The TEA source was operating in single longitudinal mode with 1J per pulse energy, while 1 kW output power was obtained from the industrial source.

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