4 March 2015 Self-efficiency improvement and cooling in thulium-doped fibers
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A way to increase the efficiency of Thulium-doped fiber systems and simultaneously prevent the generation of heat by pumping the excited state around 1460nm has been recently proposed by the authors. In this contribution we show that a Thulium-doped fiber amplifier can lase around 1460nm while simultaneously amplifying signals around ~2μm. Such an operation results in considerably higher amplification efficiencies and in lower operating temperatures without the need for an external pump around 1460nm.
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Cesar Jauregui, Cesar Jauregui, Fabian Stutzki, Fabian Stutzki, Jens Limpert, Jens Limpert, Andreas Tünnermann, Andreas Tünnermann, "Self-efficiency improvement and cooling in thulium-doped fibers", Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93441Q (4 March 2015); doi: 10.1117/12.2076405; https://doi.org/10.1117/12.2076405

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