100 W, tunable in-band thulium fiber amplifier pumped by incoherently combined 1.9 µm fiber lasers

We detail the design and performance of a high efficiency in-band pumped thulium fiber amplifier operating at the 100 W level. Using a novel pumping architecture based on three incoherently combined thulium fiber oscillators at 1904 nm and a seed laser tunable from 1970–1990 nm, efficient amplificat...

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Published in:Optics express 2023-08, Vol.31 (18), p.29245
Main Authors: Cook, Justin, Sincore, Alex, Vail, Nicholas, Krämer, Ria G., Goebel, Thorsten A., Roumayah, Patrick, Bryan, Joshua, Bodnar, Nathan, Nolte, Stefan, Richardson, Martin
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cited_by cdi_FETCH-LOGICAL-c2121-f5a7ffc59bc49e32b7320b44bdec24676802a6a2a1afcbe7e33ab140e8a418773
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container_end_page
container_issue 18
container_start_page 29245
container_title Optics express
container_volume 31
creator Cook, Justin
Sincore, Alex
Vail, Nicholas
Krämer, Ria G.
Goebel, Thorsten A.
Roumayah, Patrick
Bryan, Joshua
Bodnar, Nathan
Nolte, Stefan
Richardson, Martin
description We detail the design and performance of a high efficiency in-band pumped thulium fiber amplifier operating at the 100 W level. Using a novel pumping architecture based on three incoherently combined thulium fiber oscillators at 1904 nm and a seed laser tunable from 1970–1990 nm, efficient amplification is demonstrated in a high dopant concentration 25/65/250 µm thulium fiber. Here we use the 65 µm pedestal surrounding the core as a pump cladding to increase the cladding to core overlap and improve the overall pump absorption. Up to 89% slope efficiency is obtained with ∼100 W output power at 1990 nm. These results indicate that in-band pumping is a viable route to circumvent the thermal limitations associated with 793 nm diode pumping and provide a pathway for development of multi-kW laser sources in the 2 µm spectral window.
doi_str_mv 10.1364/OE.487601
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title 100 W, tunable in-band thulium fiber amplifier pumped by incoherently combined 1.9 µm fiber lasers
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