Volume 132, Number 5, December 2020
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||04 January 2021|
Coherent propagation of powerful out-of-phase wave beams in linear arrays of weakly coupled cores
Institute of Applied Physics RAS - 603950 Nizhny Novgorod, Russia
Received: 10 September 2020
Accepted: 12 November 2020
The coherent propagation and amplification of high-power laser beams in a multicore fiber (MCF) of $1\times N$ and $2\times N$ lattices of weakly coupled cores is studied. Exact stable analytical nonlinear solutions are found in the form of the out-of-phase distribution that describe the coherent propagation of wave beams in such MCFs. The use of these distributions makes it possible to operate with laser radiation with a power of up to 2N times of the critical self-focusing power in homogeneous media. The analytical results are confirmed by the direct numerical simulation of the wave equation. The limitations on active fiber parameters for stable amplification of the found out-of-phase solution are determined.
PACS: 42.65.Jx – Beam trapping, self-focusing and defocusing; self-phase modulation / 42.65.Tg – Optical solitons; nonlinear guided waves / 42.81.Qb – Fiber waveguides, couplers, and arrays
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