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Space-Incoherent Beam Combining of Rectangular Spot Using 18 Fiber-Transmitted Semiconductor-Laser Beams

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Journal of Russian Laser Research Aims and scope

Abstract

We report an 18×1 laser space-incoherent beam combiner with a rectangular spot used for laser heat treatment (LHT). A total of 18 semiconductor laser beams of about 972 nm output by the fiber were arranged in parallel according to the “staggered matrix.” Through beam collimation and incoherentspace beam combination, a combined laser beam characterized by rectangular spot is obtained. The structural parameters of the combiner are optimized and designed using the ray tracing method. The establishment and use of the total lateral laser intensity distribution model for the combined laser beam verify the reliability of the design work. Through simulation and laser targeting experiments, it is verified that the combined laser beam presents a single rectangular spot shape within a combined beam length of 200 mm. As a result, a maximum continuous wave (CW) beam combining power of the combined laser beam, with a focal spot size of 31×11 mm, a center wavelength of 972.34 nm, and a spectral line width of 2.27 nm, reaches 10.641 kW corresponding to a beam combining efficiency of 98.5%.

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Authors and Affiliations

  1. Institute of Photonics and Photon Technology, National Key Laboratory of Photoelectric Technology and Functional Materials, Northwest University, Xi’an, 710127, China

    Jingfeng Zhou, Yang Bai, Bei Li & Lidong Yu

  2. Shaanxi Engineering Technology Research Center for Solid State Lasers and Application, Xi’an Shaanxi, 710127, China

    Jingfeng Zhou, Yang Bai, Bei Li & Lidong Yu

Authors
  1. Jingfeng Zhou
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  2. Yang Bai
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  3. Bei Li
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  4. Lidong Yu
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Correspondence to Yang Bai.

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Zhou, J., Bai, Y., Li, B. et al. Space-Incoherent Beam Combining of Rectangular Spot Using 18 Fiber-Transmitted Semiconductor-Laser Beams. J Russ Laser Res 43, 378–388 (2022). https://doi.org/10.1007/s10946-022-10062-1

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  • DOI: https://doi.org/10.1007/s10946-022-10062-1

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