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Efficient resonantly pumped 2.8-microm Er(3+):GSGG laser.

R C Stoneman, L Esterowitz

    Optics Letters
    |October 2, 2009
    PubMed
    Summary

    Efficient room-temperature laser operation at 2.8 micrometers was achieved using Erbium-doped Gadolinium Scandium Gallium Garnet (Er(3+):GSGG). This laser shows high efficiency due to population recycling via upconversion from the lower laser state.

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    Area of Science:

    • Materials Science
    • Optics and Photonics
    • Laser Physics

    Background:

    • Erbium-doped materials are crucial for various laser applications.
    • Achieving efficient laser operation at 2.8 micrometers presents unique challenges.
    • Understanding population dynamics is key to optimizing laser performance.

    Purpose of the Study:

    • To demonstrate efficient continuous-wave (cw) laser operation of the Er(3+):GSGG transition at 2.8 micrometers.
    • To investigate the factors contributing to high laser efficiency.
    • To explore the role of upconversion in laser performance.

    Main Methods:

    • Utilized Er(3+):GSGG crystal for laser medium.
    • Employed direct diode pumping at 0.97 micrometers.
    • Characterized laser output and efficiency at room temperature.

    Main Results:

    • Achieved efficient cw laser operation at 2.8 micrometers.
    • Recorded a slope efficiency of 36% for the 2.8-microm laser.
    • Demonstrated greater than unity quantum efficiency, attributed to upconversion.

    Conclusions:

    • Efficient 2.8-micrometer laser operation in Er(3+):GSGG is feasible at room temperature.
    • Population recycling through upconversion significantly enhances laser efficiency.
    • This work highlights the potential of Er(3+):GSGG for mid-infrared laser applications.

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