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Related Experiment Video

Updated: Apr 19, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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All-fiber frequency-doubled visible laser.

Costantino Corbari, Alexey V Gladyshev, Laure Lago

    Optics Letters
    |December 10, 2014
    PubMed
    Summary

    Researchers developed an all-fiber ns-pulsed visible laser at 521 nm. This breakthrough achieved unprecedented second-harmonic generation power and efficiency using periodically poled silica fibers.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Visible light generation is crucial for various applications.
    • Efficient frequency conversion in the visible spectrum using fiber lasers remains challenging.
    • Periodically poled fibers offer a promising route for nonlinear optical processes.

    Purpose of the Study:

    • To demonstrate an all-fiber nanosecond-pulsed visible laser source at 521 nm.
    • To achieve high second-harmonic generation (SHG) power and conversion efficiency.
    • To explore the potential of advanced poling techniques for visible light generation.

    Main Methods:

    • Utilized an Yb-doped fiber laser as the fundamental source.
    • Employed a periodically poled silica fiber for quasi-phase matched (QPM) second-harmonic generation (SHG).

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  • Fabricated long (over 20 cm) χ(2)-gratings using continuous periodic UV erasure for poling.

    • Main Results:

    • Achieved a 50-mW second-harmonic (SH) output power at 521 nm, a significant improvement over previous results.
    • Demonstrated a normalized conversion efficiency of 0.3%/W, the highest reported for poled fiber technology.
    • Obtained a 21% conversion efficiency for doubling 8-ps pulses from a neodymium-doped yttrium vanadate laser.

    Conclusions:

    • The developed all-fiber laser system represents a significant advancement in visible light generation.
    • Continuous periodic UV erasure enables the fabrication of long gratings for efficient nonlinear frequency conversion.
    • This work paves the way for compact and efficient visible fiber laser sources.