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).
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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