Journal
LASER PHYSICS
Volume 28, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1555-6611/aaa115
Keywords
self-action; self-focusing; soliton; self-compression; coupled light-guides
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Funding
- Russian Science Foundation [16-12-10472]
- Russian Science Foundation [16-12-10472] Funding Source: Russian Science Foundation
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The self-action features of wave packets propagating in a 2D system of equidistantly arranged fibers are studied analytically and numerically on the basis of the discrete nonlinear Schrodinger equation. Self-consistent equations for the characteristic scales of a Gaussian wave packet are derived on the basis of the variational approach, which are proved numerically for powers P < 10P(cr), slightly exceeding the critical one for self-focusing. At higher powers, the wave beams become filamented, and their amplitude is limited due to the nonlinear breaking of the interaction between neighboring light-guides. This makes it impossible to collect a powerful wave beam in a single light-guide. Variational analysis shows the possibility of the adiabatic self-compression of soliton-like laser pulses in the process of 3D self-focusing on the central light-guide. However, further increase of the field amplitude during self-compression leads to the development of longitudinal modulation instability and the formation of a set of light bullets in the central fiber. In the regime of hollow wave beams, filamentation instability becomes predominant. As a result, it becomes possible to form a set of light bullets in optical fibers located on the ring.
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