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Unidirectional ring laser operation and tunable single-frequency emission using differential parametric gain.

O B Jensen, M Helmark, A G Urskov

    Optics Letters
    |January 9, 2024
    PubMed
    Summary
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    This study demonstrates a new method for unidirectional solid-state ring lasers using difference frequency mixing. This approach also generates tunable single-frequency mid-infrared light from a diode laser.

    Area of Science:

    • Laser physics
    • Nonlinear optics
    • Solid-state lasers

    Background:

    • Solid-state ring lasers often require complex methods for unidirectional operation.
    • Difference frequency mixing is a nonlinear optical process used for frequency conversion.

    Purpose of the Study:

    • To demonstrate a novel approach for achieving unidirectional operation in a 1064 nm solid-state ring laser.
    • To generate single-frequency mid-infrared (mid-IR) light utilizing the same nonlinear process.

    Main Methods:

    • Utilizing difference frequency mixing (DFM) in a periodically poled lithium niobate (PPLN) crystal.
    • Exploiting directional parametric gain from a single-pass diode laser.
    • Tuning a diode laser from 780 to 815 nm to achieve phase-matching for DFM.

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    Main Results:

    • Achieved stable unidirectional operation of the 1064 nm solid-state ring laser.
    • Generated tunable single-frequency mid-IR light in the 2.9 to 3.5 µm range.
    • Demonstrated the viability of DFM for both laser control and frequency generation.

    Conclusions:

    • The proposed DFM-based method offers a compact and effective way to achieve unidirectional operation in solid-state lasers.
    • This technique simultaneously enables the generation of tunable single-frequency mid-IR radiation, expanding laser functionalities.