17 February 2010 Alleviate photo darkening by single-mode RMO fiber design
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Abstract
In this work we propose and demonstrate a single mode fiber design that alleviates photo darkening. The fiber design is based on a reduced signal mode to gain material overlap which is found to reduce the induced losses of PD. For the fiber, saturated photo darkening operation is observed after 1500 hours operation with less than 7 % reduction in slope efficiency from 350 W output power in Yb/Al co-doped material. Power scalability up to 5 kW of the RMO fiber design is theoretically predicted.
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Kent E. Mattsson, Jes Broeng, "Alleviate photo darkening by single-mode RMO fiber design", Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 758024 (17 February 2010); doi: 10.1117/12.840870; https://doi.org/10.1117/12.840870
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