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- W2013189140 abstract "We have numerically investigated the behavior of the LP<sub>01</sub> fundamental mode of a step-index, multimode (MM) fiber as the optical power approaches the self-focusing limit (<i>P</i><sub>crit</sub>). The analysis includes the effects of optical gain and fiber bending and are thus applicable to coiled fiber amplifiers. We find that at powers below <i>P</i><sub>crit</sub>, there exist stably propagating power-dependent modifications of the LP<sub>01</sub> mode, in contrast to some previous solutions that exhibited large-amplitude oscillations in beam waist along the fiber. For the first time, to our knowledge, we show that in a MM fiber amplifier seeded with the low-power LP<sub>01</sub> eigenmode, the transverse spatial profile will adiabatically evolve through power-dependent stationary solutions as the beam is amplified toward <i>P</i><sub>crit</sub>. In addition, for a given value of the nonlinear index, <i>P</i><sub>crit</sub> is found to be nearly the same in the bulk material and in a step-index fiber. These conclusions hold for both straight and bent fibers, although the quantitative details are somewhat different." @default.
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- W2013189140 date "2007-02-08" @default.
- W2013189140 modified "2023-09-27" @default.
- W2013189140 title "Numerical modeling of self-focusing beams in fiber amplifiers" @default.
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- W2013189140 doi "https://doi.org/10.1117/12.701571" @default.
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