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Efficiency improvement in Thulium-doped fibers via excited state pumping

: Jauregui, Cesar; Stutzki, Fabian; Jansen, Florian; Limpert, Jens; Tünnermann, Andreas


Ramachandran, S. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers XI. Technology, Systems, and Applications : 3 - 6 February 2014, San Francisco, California, United States
Bellingham, WA: SPIE, 2014 (Proceedings of SPIE 8961)
ISBN: 978-0-8194-9874-8
Paper 89611B
Conference "Fiber Lasers - Technology, Systems, and Applications" <11, 2014, San Francisco/Calif.>
Conference Paper
Fraunhofer IOF ()
Tm-doped fibers; heat-load reduction; efficiency improvement; excited-state pump

In this contribution we propose a new way to simultaneously increase (almost double) the amplification efficiency and reduce the thermal issues of Thulium-doped fibers. This technique is based on pumping the excited state of the Thulium fiber, in order to bring the ions from the pump level to the upper laser level via stimulated emission instead of via phononic relaxation processes. Our simulations show that using this technique the efficiency of the amplification process can be increased by almost a factor of 2.