Closed-cycle gas cooling techniques have resulted in a self-contained cw kW CO2 laser having a 1-m active length. The CO2, N2, He gas mixture is recirculated through a heat exchanger following forced convection transverse to the optical cavity and the electrical discharge. Output power has been measured as a function of flow velocity and electrical input power.
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Tiffany et al. (1969) studied this question.
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