26 February 2018 Power scaling limits in high power fiber amplifiers due to transverse mode instability, thermal lensing, and fiber mechanical reliability
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Proceedings Volume 10512, Fiber Lasers XV: Technology and Systems; 1051205 (2018) https://doi.org/10.1117/12.2289792
Event: SPIE LASE, 2018, San Francisco, California, United States
Abstract
We introduced a simple formula providing the mode-field diameter shrinkage, due to heat load in fiber amplifiers, and used it to compare the traditional thermal-lensing power limit (PTL) to a newly developed transverse-mode instability (TMI) power limit (PTMI), giving a fixed ratio of PTMI/PTL≈0.6, in very good agreement with experiment. Using a failure-in-time analysis we also introduced a new power limiting factor due to mechanical reliability of bent fibers. For diode (tandem) pumping power limits of 28kW (52kW) are predicted. Setting a practical limit of maximum core diameter to ~35μm, the limits reduce to 15kW (25kW).
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Michalis N. Zervas "Power scaling limits in high power fiber amplifiers due to transverse mode instability, thermal lensing, and fiber mechanical reliability", Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 1051205 (26 February 2018); doi: 10.1117/12.2289792; https://doi.org/10.1117/12.2289792
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