2024
DOI: 10.1364/ao.517483
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Impact of thermal lensing on the TMI threshold powers in rod-type Yb-doped fiber amplifiers

Marc D. Mermelstein

Abstract: The impact of thermal lensing (TL) on the transverse mode instability (TMI) threshold power in rod-type fiber amplifiers is investigated. Simulations are conducted with a 3D coupled mode analysis on a set of five scaled large pitch fiber (LPF) amplifiers. The LPF fibers are represented by surrogate step-index fibers (SIFs) with scaled cladding diameters, core diameters, and numerical apertures for a fixed normalized frequency V equal to 3.0 and scaled modal field overlap integrals with the core and cladding. I… Show more

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