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Continuous-wave, double-pass second-harmonic generation with 60% efficiency in a single MgO:PPSLT crystal.

Matthias Stappel, Daniel Kolbe, Jochen Walz

    Optics Letters
    |July 1, 2014
    PubMed
    Summary

    We achieved high-efficiency, high-power second-harmonic generation (SHG) using a double-pass MgO:PPSLT crystal. This method significantly enhances harmonic power compared to single-pass techniques.

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    Area of Science:

    • Nonlinear optics
    • Materials science

    Background:

    • Second-harmonic generation (SHG) is crucial for frequency conversion in laser systems.
    • Periodically poled stoichiometric lithium tantalate (PPSLT) crystals offer excellent nonlinear properties.
    • MgO doping enhances the photorefractive damage resistance of lithium tantalate crystals.

    Purpose of the Study:

    • To develop a high-efficiency, high-power SHG scheme.
    • To investigate the performance of a double-pass configuration in MgO-doped periodically poled stoichiometric lithium tantalate (MgO:PPSLT).
    • To compare the double-pass scheme with traditional single-pass SHG.

    Main Methods:

    • Utilizing a single MgO:PPSLT crystal in a double-pass configuration.
    • Employing a single-frequency, continuous-wave fiber amplifier laser system at 1091 nm as the pump source.
    • Characterizing the output power, conversion efficiency, and beam quality.

    Main Results:

    • Achieved a 60% conversion efficiency for SHG.
    • Generated 12.8 W of harmonic power at 545.5 nm.
    • Obtained high beam quality (M²<1.2).
    • Observed a double-pass enhancement factor greater than two compared to single-pass SHG at high pump power.

    Conclusions:

    • The double-pass scheme significantly boosts SHG efficiency and power.
    • MgO:PPSLT is a suitable material for high-power frequency conversion.
    • This approach offers a practical method for generating high-power green light.