Intra-fiber mode combining schemes, demonstrating high power brightness preservation and coherent-coupling brightness enhancement

Shamir, Yariv; Zuitlin, Roey; Glick, Yaakov; Aviel, Matitya; Shafir, N.; Feldman, Revital; Dahan, Asaf; Urbach, Benayahu; Lévy, Daniel; Shekel, Eyal; Sintov, Yoav

doi:10.1117/12.2058099

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…As is well known, the all-fiber scheme, on the other hand, has the advantages of a compact structure, being free of alignment and having a long-term stable performance. The design and fabrication of high-power all-fiber components also has boosted the rapid development and wide application of fiber lasers [22][23][24] . Therefore, CBC using an all-fiber combiner can bypass the issues brought about by traditional free-space structures [25][26][27][28] , and is promising from the laser engineering aspect.…”

Section: Introductionmentioning

confidence: 99%

Mismatch analysis of all-fiber coherent beam combiners based on the self-imaging effect

Yan,

Liu,

Zhang

et al. 2023

High Pow Laser Sci Eng

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All-fiber coherent beam combiners based on the self-imaging effect can achieve a near-perfect single laser beam, which can provide a promising way to overcome the power limitation of a single-fiber laser. One of the key points is combining efficiency, which is determined by various mismatches during fabrication. A theoretical model has been built, and the mismatch error is analyzed numerically for the first time. The mismatch errors have been numerically studied with the beam quality and combining efficiency being chosen as the evaluation criteria. The tolerance of each mismatch error for causing 1% loss is calculated to guide the design of the beam combiners. The simulation results are consistent with the experimental results, which show that the mismatch error of the square-core fiber is the main cause of the efficiency loss. The results can provide useful guidance for the fabrication of all-fiber coherent beam combiners.

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Section: Introductionmentioning

confidence: 99%

Mismatch analysis of all-fiber coherent beam combiners based on the self-imaging effect

Yan,

Liu,

Zhang

et al. 2023

High Pow Laser Sci Eng

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Fiber-laser monolithic coherent beam combiner based on multicore photonic crystal fiber

2014

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Self-imaging-based high-power all-fiber coherent combiners: fabrication and preliminary demonstration

Liu

Yan

et al. 2023

Opt. Lett.

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Self-imaging combiners can achieve near-perfect filled-aperture coherent beam combination in an all-fiber format with a high-power operation capability. In this Letter, the fabrication of proposed self-imaging combiners is presented, along with a demonstration of a 2 × 2 configuration that uses commercially available large-mode-area fibers, glass tube and square-core fiber. Two types of self-imaging combiners have been fabricated using polarization-maintaining fibers and non-polarization-maintaining fibers, respectively, and these have been tested in an all-fiber coherent beam combination system. Preliminary results reveal that non-polarization-maintaining fibers can achieve better positioning precision, and a maximal combining efficiency of 52.7% has been achieved. The deviation of the demonstrated combining efficiency from the theoretical prediction is mainly attributed to the distortion of the fiber bundle and square-core output fiber, which can be further improved by refining the fabrication process and employing specially developed square-core fiber with better geometrical precision. To the best of the authors’ knowledge, this is the first validation of all-fiber coherent beam combining based on the self-imaging effect.

show abstract

Intra-fiber mode combining schemes, demonstrating high power brightness preservation and coherent-coupling brightness enhancement

Cited by 3 publications

References 8 publications

Mismatch analysis of all-fiber coherent beam combiners based on the self-imaging effect

Mismatch analysis of all-fiber coherent beam combiners based on the self-imaging effect

Fiber-laser monolithic coherent beam combiner based on multicore photonic crystal fiber

Self-imaging-based high-power all-fiber coherent combiners: fabrication and preliminary demonstration

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