Abstract
An output power of at was generated at a slope efficiency of 51% when a double-clad -doped silica fiber laser was pumped with high-power diode lasers. Pump excited state absorption from the upper laser level populates higher energy levels allowing cross relaxation to repopulate the upper laser level at a quantum efficiency greater than unity and to limit losses relating to additional pump excited state absorption. The output power was scaled to when both ends of the fiber were pumped.
© 2007 Optical Society of America
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