Abstract

In this paper it is shown that pumping at the excited state of Thulium high-power fibers leads to a significant cooling and efficiency improvement. Nearly a factor 2 higher efficiency is expected with this technique. According to our simulations, in a 4m long 10µm core Tm-doped fiber pumped with 100W at 793nm, this technique would allow reducing the temperature in the core from ~400°C to ~160°C while simultaneously increasing the output power from ~37W to ~76W.

© 2013 Optical Society of America

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