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Updated: Dec 1, 2025

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Simple and effective coupling technique for polarization maintaining fibers.

Xunda Jiang, Yuanyuan Guo, Chengyin Han

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    |November 11, 2020
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    We developed a simple method to couple laser beams into polarization-maintaining fibers (PMFs) with high efficiency. This technique uses a two-lens system for beam shaping, achieving over 80% coupling for diode lasers.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Fiber Optics

    Background:

    • Efficient coupling of free-space laser beams into polarization-maintaining fibers (PMFs) is crucial for various optical applications.
    • Existing methods may lack efficiency or simplicity, hindering widespread adoption.

    Purpose of the Study:

    • To present a straightforward and highly efficient technique for coupling laser beams into PMFs.
    • To demonstrate the versatility and effectiveness of the proposed method across different laser sources.

    Main Methods:

    • Utilized the knife-edge method to measure input and output laser beam sizes near the PMF.
    • Designed a two-lens system for precise beam shaping based on measured beam size differences.
    • Employed seeding mirrors for tapered amplifiers and mode-filtered beams for external cavity diode lasers.

    Main Results:

    • Achieved coupling efficiency exceeding 70% for tapered amplifiers.
    • Obtained coupling efficiency above 80% for external cavity diode lasers.
    • Demonstrated that theoretical maximum coupling efficiency is approachable with a mode-filtered beam.

    Conclusions:

    • The presented technique offers a simple, effective, and high-efficiency solution for laser beam coupling into PMFs.
    • This method is adaptable for diverse applications, including coherent optical communication, atomic physics, and precision measurements.