Highly efficient coherent beam combining of tiled aperture arrays using out-of-phase pattern

Андрианов, А. В.; Калинин, Н. В.; Anashkina, Elena A.; Leuchs, Gerd

doi:10.1364/ol.391259

Cited by 12 publications

(7 citation statements)

References 26 publications

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“…It should be noted that the radiation combining from a square matrix of cores turns out to be more efficient than in the case of their circular arrangement. The paper [31] discussed a scheme for coherent combining of wave beams with an out-of-phase wave field distribution at the output of a square fiber lattice. In this scheme, radiation from the output of individual cores is collimated using an array of microlenses with a specially selected focal length.…”

Section: Latticementioning

confidence: 99%

“…Radiation combining in the form of an out-of-phase mode from the MCF output is most efficient for fibers with cores arranged in a square lattice [31]. Satisfactory combining efficiency can also be achieved in the case of a circular arrangement of cores using the scheme shown in Figure 2, which requires two phase masks, one of which has a relatively complex form.…”

Section: Latticementioning

confidence: 99%

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Tapered Multicore Fiber for High-Power Laser Amplifiers

et al. 2022

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The problem of coherent amplification of the outof-phase mode in tapered multicore fibers with cores arranged in a ring and in a square lattice is studied theoretically. The stability of out-of-phase field distributions with respect to both inhomogeneities of the refractive index and the initial wave field distribution is demonstrated in numerical modeling. Coherent combining of radiation into a single beam with good quality and efficiency of about 80% for ring cores arrangement and more than 90% for square cores arrangement is possible. Achievement of 55 MW of total power at the output of a fiber with 11 × 11 cores is numerically demonstrated.

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Section: Latticementioning

confidence: 99%

Section: Latticementioning

confidence: 99%

Tapered Multicore Fiber for High-Power Laser Amplifiers

et al. 2022

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“…As was shown theoretically and experimentally, the in-phase supermode is susceptible to instability at relatively high powers, while the out-of-phase mode is stable [31,32]. Further, the coherent beam combining (CBC) technique for out-of-phase supermode radiation can be easily implemented using only two beamsplitters [33,34]. In this case, a feedback system is not required for channel phasing, and the combining efficiency is significantly higher than that for the in-phase supermode [33].…”

Section: Introductionmentioning

confidence: 98%

“…Further, the coherent beam combining (CBC) technique for out-of-phase supermode radiation can be easily implemented using only two beamsplitters [33,34]. In this case, a feedback system is not required for channel phasing, and the combining efficiency is significantly higher than that for the in-phase supermode [33]. Moreover, for the out-of-phase supermode, the overlap integral with doped cores is maximal and, hence, the gain is maximal, which makes it possible to implement self-selection of modes in the laser and to obtain lasing in this particular mode.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Mid-IR Lasers Based on Tb-Doped Chalcogenide Multicore Fibers

Salnikov,

Andrianov,

Anashkina

2024

Fibers

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Mid-IR fiber lasers operating at wavelengths near 5 μm are of great interest for many fundamental and industrial applications, but only a few experimental samples based on active chalcogenide fibers have been demonstrated so far. One of the limitations of the power of such lasers may be a fairly low fiber damage threshold. To solve this problem, we developed and numerically investigated in detail a mid-IR fiber laser at 5.3 µm with multi-W output power pumped into the cladding at a wavelength of 2 µm. We proposed using a Tb-doped chalcogenide multicore fiber with 25 single-mode cores arranged in a 5 × 5 square lattice as an active medium. The proposed laser design surpasses the power limit of single-core chalcogenide fibers. When simulating lasers, we specified realistic parameters of Tb-doped chalcogenide glass based on published experimental data. We performed a comprehensive theoretical analysis, studied the influence of various factors on the characteristics of generation, and found optimal system parameters and expected generation parameters.

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“…According to the theory, the intensity distribution is nonuniform at low powers (it is higher in the central core and lower at the peripheral), however, it equalizes with increasing power [36]. Besides, it was shown in a recent work [40] that radiation with a transverse structure of such a supermode can be easily coherently combined with high efficiency. Until now, to the best of our knowledge, active and passive MCFs with a square array of uncoupled cores have only been studied in terms of spatial-multiplexed data transfer [41][42][43], optical amplification [18,44], and demonstration of coherent combining using an in-phase pattern [19].…”

Section: Introductionmentioning

confidence: 99%

Controlled Excitation of Supermodes in a Multicore Fiber with a 5 × 5 Square Array of Strongly Coupled Cores

et al. 2021

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Coherent propagation of supermodes in a multicore fiber is promising for power scaling of fiber laser systems, eliminating the need for the active feedback system to maintain the phases between the channels. We studied the propagation of broadband pulsed radiation at a central wavelength of 1030 nm in a multicore fiber with coupled cores arranged in a square array. We designed and fabricated a silica multicore fiber with a 5 × 5 array of cores. For controllable excitation of a desired supermode, we developed a beam-forming system based on a spatial light modulator. We experimentally measured intensity and phase distributions of the supermodes, in particular, the in-phase and out-of-phase supermodes, which matched well the numerically calculated profiles. We obtained selective excitation and coherent propagation of broadband radiation with the content of the out-of-phase supermode of up to 90% maintained without active feedback. Using three-dimensional numerical modeling with allowance for a refractive index profile similar to those of the developed fiber, we demonstrated stable propagation of the out-of-phase supermode and collapse of the in-phase supermode at a high signal power.

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Highly efficient coherent beam combining of tiled aperture arrays using out-of-phase pattern

Cited by 12 publications

References 26 publications

Tapered Multicore Fiber for High-Power Laser Amplifiers

Tapered Multicore Fiber for High-Power Laser Amplifiers

Numerical Modeling of Mid-IR Lasers Based on Tb-Doped Chalcogenide Multicore Fibers

Controlled Excitation of Supermodes in a Multicore Fiber with a 5 × 5 Square Array of Strongly Coupled Cores

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