Abstract
The first Potassium Diode Pumped Alkali Laser (DPAL) with flowing gain medium in closed cycle system has been demonstrated. A slope efficiency of 31% for continuous wave operation was achieved with a maximum output power 5 W. The flow loop was operated with a helium buffer gas pressure of 800 Torr and an alkali metal temperature of 185 °C. An examination of laser performance vs flow speed demonstrated higher efficiencies with increasing flow speeds.
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