Coherent propagation of laser beams in a small-sized system of weakly coupled optical light guides

Balakin, A. A.; Skobelev, S. A.; Anashkina, Elena A.; Andrianov, Alexey V.; Litvak, A. G.

doi:10.1103/physreva.98.043857

Cited by 26 publications

(29 citation statements)

References 25 publications

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“…The use of a multi-core fiber (MCF), consisting of identical equidistant weakly coupled optical fibers, makes it possible to realize initially coherent propagation of laser radiation with a total power noticeably higher than it can be transmitted in a single optical fiber. However, as theo retical and experimental studies have shown, such systems have its own critical power (Balakin et al, 2016) whereby the self-focusing of the quasihomogeneous distribution of the wave field and its separation into a set of incoherent structures occurs.…”

Section: Coherent Propagation Of Laser Beams In Mcf Fibers Balakin Amentioning

confidence: 99%

“…Therefore, we have considered a small-sized optical system of 2N identical weakly cou pled optical fibers arranged in a ring (Balakin et. al., 2018).…”

Section: Coherent Propagation Of Laser Beams In Mcf Fibers Balakin Amentioning

confidence: 99%

“…Использование многосердцевинного волокна, состоящего из одинаковых эквидистантно расположенных слабо связанных световодов, позволяет реализовать из начально когерентное распространение лазерного излучения с суммарной мощностью заметно выше, чем может передаваться в одиночном световоде. Однако, как показали тео ретические и экспериментальные исследования, в рассматриваемой системе существует своя собственная критическая мощность (Balakin et. al., 2016), при которой происходит са мофокусировка квазиоднородного распределения волнового поля и его расслоение на набор некогерентных структур.…”

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“…Поэтому нами были рассмотрены малоразмерные оптические системы из 2N иден тичных слабосвязанных световодов, расположенных по кольцу (Balakin et. al., 2018).…”

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Coherent Propagation of Laser Beams in MCF Fibers

Balakin

Skobelev

Andrianov

et al. 2019

JOR

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The successful development of fiber-optic technologies in recent decades has stimulated research on the replacement of components of solid-state laser systems with fiber components, which can drastically change the attractiveness of the corresponding applied developments. Yielding on the energy characteristics of solid-state systems, fiber lasers and nonlinear optical devices have high efficiency of conversion of pump energy to radiation energy associated with waveguide geometry, high quality of the spatial profile of the laser beam, as well as low cost, compactness, lack of alignment in work process. Note that the maximum achievable radiation power in a single fiber is limited primarily by the process of self-focusing, which leads to fiber damage. The use of a multi-core fiber (MCF), consisting of identical equidistant weakly coupled optical fibers, makes it possible to realize initially coherent propagation of laser radiation with a total power noticeably higher than it can be transmitted in a single optical fiber. However, as theoretical and experimental studies have shown, such systems have its own critical power (Balakin et al., 2016) whereby the self-focusing of the quasihomogeneous distribution of the wave field and its separation into a set of incoherent structures occurs. Therefore, we have considered a small-sized optical system of 2N identical weakly coupled optical fibers arranged in a ring (Balakin et. al., 2018). In such systems, it is possible to find stable distributions of intense wave beams, which allow coherent radiation transport over long distances. The total radiation power in the found distributions can significantly (up to 2N times) exceed the critical self-focusing power in continuous media. This manifests itself most clearly for the distribution of un ~ (-1)n with antiphase fields in neighboring waveguides, which is stable at an arbitrary wave beam power. Direct numerical simulation of a nonlinear wave equation confirms the stability of the field distributions found. The research was supported by the RAS Presidium Program «Nonlinear dynamics: fundamental problems and applications».

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Section: Coherent Propagation Of Laser Beams In Mcf Fibers Balakin Amentioning

confidence: 99%

“…Therefore, we have considered a small-sized optical system of 2N identical weakly cou pled optical fibers arranged in a ring (Balakin et. al., 2018).…”

Section: Coherent Propagation Of Laser Beams In Mcf Fibers Balakin Amentioning

confidence: 99%

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Coherent Propagation of Laser Beams in MCF Fibers

Balakin

Skobelev

Andrianov

et al. 2019

JOR

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“…As a rule, in the study of multicore fibers, primary attention is paid to the in-phase supermode [37,39,40]. However, in the recent analytical, numerical, and experimental works, it has been shown that an out-of-phase supermode (in which the phases of the fields in neighboring cores differ by π) can also be of great interest due to its stability in different nonlinear regimes [41][42][43][44]. Multicore fibers allow operation with pulse energies and powers higher than those of one-core fibers [41,42,44] (however, for ultrashort pulses, spatial walk-off of supermodes should be taken into account [45,46]).…”

Section: Introductionmentioning

confidence: 99%

Design and Dispersion Control of Microstructured Multicore Tellurite Glass Fibers with In-Phase and Out-of-Phase Supermodes

Anashkina

Andrianov

2021

Photonics

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High nonlinearity and transparency in the 1–5 μm spectral range make tellurite glass fibers highly interesting for the development of nonlinear optical devices. For nonlinear optical fibers, group velocity dispersion that can be controlled by microstructuring is also of great importance. In this work, we present a comprehensive numerical analysis of dispersion and nonlinear properties of microstructured two-, four-, six-, and eight-core tellurite glass fibers for in-phase and out-of-phase supermodes and compare them with the results for one-core fibers in the near- and mid-infrared ranges. Out-of-phase supermodes in tellurite multicore fibers are studied for the first time, to the best of our knowledge. The dispersion curves for in-phase and out-of-phase supermodes are shifted from the dispersion curve for one-core fiber in opposite directions; the effect is stronger for large coupling between the fields in individual cores. The zero dispersion wavelengths of in-phase and out-of-phase supermodes shift to opposite sides with respect to the zero-dispersion wavelength of a one-core fiber. For out-of-phase supermodes, the dispersion can be anomalous even at 1.55 μm, corresponding to the operating wavelength of Er-doped fiber lasers.

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