A large-volume high-power copper vapor laser excited by a longitudinal discharge in an annular volume has been demonstrated. The annular geometry provides a device configuration in which the laser prf, governed by a geometric diffusion length, can be made independent of the device volume. Laser powers of 35 W at a prf of 6 kHz has been obtained with an overall device efficiency of 0.44%.
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Kan et al. (1979) studied this question.
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