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<p>This study introduces an optical design for a highly efficient fiber-coupled laser diode (FCLD) system, specifically tailored for high-energy laser applications. The design employs toric lenses to reconstruct the wavefront along the fast and slow axes with precision, addressing the critical challenges of laser beam collimation and fiber coupling. The innovative approach integrates beam collimation and mode-matching methodologies to achieve optimal performance. The design requirements of the optical coupler correspond to a single-emitter 10&#xa0;W laser diode intended to deliver 9.9&#xa0;W of output through a multimode fiber with a numerical aperture (NA) of 0.22 and a core diameter of 200&#xa0;μm. Rigorous evaluation of the beam parameter product demonstrates exceptional beam quality, with values of 0.2437&#xa0;mm mrad and 0.2697&#xa0;mm mrad for the fast and slow axes, respectively. To ensure the robustness of the optical system, comprehensive tolerance analyses were conducted, accounting for displacement, NA mismatch, tilt angles, and lateral misalignments. Ray-tracing simulations validate the design, revealing a maximum coupling efficiency of approximately 99%, which highlights the superior performance of the proposed system. The incorporation of toric lenses plays a pivotal role in correcting the elliptical beam shape and astigmatism inherent to laser diode outputs, significantly enhancing beam collimation and coupling efficiency compared to traditional spherical optics. This study establishes a new benchmark in fiber-coupled laser diode systems, demonstrating significant advancements in efficiency, beam quality, and optical performance for high-energy laser applications.</p>

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Efficient optical design for fiber coupling of a high-power laser diode using toric lenses

  • 期刊论文

  • 发表日期：

    2026年2月19日

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  • Sonam Berwal,
  • Vinod Parmar,
  • Pramod Kumar,
  • Neha Khatri

摘要

This study introduces an optical design for a highly efficient fiber-coupled laser diode (FCLD) system, specifically tailored for high-energy laser applications. The design employs toric lenses to reconstruct the wavefront along the fast and slow axes with precision, addressing the critical challenges of laser beam collimation and fiber coupling. The innovative approach integrates beam collimation and mode-matching methodologies to achieve optimal performance. The design requirements of the optical coupler correspond to a single-emitter 10 W laser diode intended to deliver 9.9 W of output through a multimode fiber with a numerical aperture (NA) of 0.22 and a core diameter of 200 μm. Rigorous evaluation of the beam parameter product demonstrates exceptional beam quality, with values of 0.2437 mm mrad and 0.2697 mm mrad for the fast and slow axes, respectively. To ensure the robustness of the optical system, comprehensive tolerance analyses were conducted, accounting for displacement, NA mismatch, tilt angles, and lateral misalignments. Ray-tracing simulations validate the design, revealing a maximum coupling efficiency of approximately 99%, which highlights the superior performance of the proposed system. The incorporation of toric lenses plays a pivotal role in correcting the elliptical beam shape and astigmatism inherent to laser diode outputs, significantly enhancing beam collimation and coupling efficiency compared to traditional spherical optics. This study establishes a new benchmark in fiber-coupled laser diode systems, demonstrating significant advancements in efficiency, beam quality, and optical performance for high-energy laser applications.