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High-power and highly efficient Tm 3 + -doped silica fiber lasers pumped with diode lasers operating at 1150 nm

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Abstract

An output power of 1.74W at 2.03μm was generated at a slope efficiency of 51% when a double-clad Tm3+-doped silica fiber laser was pumped with high-power 1150nm 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 4.77W when both ends of the fiber were pumped.

© 2007 Optical Society of America

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