9 March 2016 85 µm core rod fiber amplifier delivering 350 W/m
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Abstract
An improved version of the distributed modal filtering (DMF) rod fiber is tested in a high power setup delivering 350 W/m of extracted signal average power limited by the available pump power. The rod fiber is thoroughly tested to record the transverse modal instability (TMI) behavior and also measure degradation of the TMI threshold with operation time due to induced absorption in the active material increasing the thermo-optical heat load. Multiple testing degrades the rod fiber and TMI threshold from >360 W to a saturated power level of roughly 240 W.
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Mette M. Johansen, Mette M. Johansen, Mattia Michieletto, Mattia Michieletto, Torben Kristensen, Torben Kristensen, Thomas T. Alkeskjold, Thomas T. Alkeskjold, Jesper Lægsgaard, Jesper Lægsgaard, "85 µm core rod fiber amplifier delivering 350 W/m", Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97280I (9 March 2016); doi: 10.1117/12.2213274; https://doi.org/10.1117/12.2213274
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