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Related Experiment Videos

High average power parametric wavelength conversion at 3.31-3.48 m in MgO:PPLN.

R T Murray, T H Runcorn, S Guha

    Optics Express
    |April 7, 2017
    PubMed
    Summary

    High average power mid-infrared (mid-IR) generation was achieved using synchronized fiber amplifiers and periodically poled lithium niobate. This research demonstrates efficient, tunable mid-IR radiation with excellent beam quality.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Mid-infrared (mid-IR) radiation is crucial for various applications, including spectroscopy, sensing, and free-space communications.
    • Efficient and high-power generation of tunable mid-IR light remains a significant challenge in laser technology.

    Purpose of the Study:

    • To demonstrate high average power mid-infrared generation using synchronized ytterbium and erbium fiber amplifier systems.
    • To investigate the efficiency and beam quality of the generated mid-IR radiation.
    • To validate experimental findings through numerical modeling.

    Main Methods:

    • Utilized synchronized nanosecond pulsed ytterbium and erbium fiber amplifier systems.
    • Employed periodically poled lithium niobate (PPLN) for nonlinear frequency conversion.

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  • Tuned the output wavelength across the 3.31-3.48 μm range.
  • Performed numerical modeling to analyze pump depletion regimes.

    • Main Results:

    • Generated over 6 W of mid-IR radiation.
    • Achieved power conversion efficiencies exceeding 75%.
    • Obtained near diffraction-limited beam quality with M² = 1.4.
    • Verified experimental results with numerical simulations across different pump depletion levels.

    Conclusions:

    • Synchronized fiber amplifier systems offer a viable route to high-power, tunable mid-IR generation.
    • Periodically poled lithium niobate is an effective nonlinear medium for this application.
    • The demonstrated system provides excellent beam quality and high efficiency, suitable for demanding applications.