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Temperature-insensitive frequency tripling for generating high-average power UV lasers.

Haizhe Zhong, Peng Yuan, Shuangchun Wen

    Optics Express
    |March 26, 2014
    PubMed
    Summary

    Researchers developed a new method for generating high-power ultraviolet (UV) lasers using third-harmonic generation (THG). This novel technique enhances temperature-insensitive phase-matching (PM) by using two crystals, improving laser stability and power output.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • High-average power ultraviolet (UV) laser generation is crucial for various scientific and industrial applications.
    • Third-harmonic generation (THG) is a key nonlinear optical process for producing UV light.
    • Achieving stable and efficient THG often requires precise temperature control due to phase-matching (PM) sensitivity.

    Purpose of the Study:

    • To demonstrate a novel frequency tripling scheme for high-average power UV laser generation.
    • To develop a temperature-insensitive phase-matching (PM) method for third-harmonic generation (THG).
    • To investigate the use of cascaded crystals with opposite temperature derivatives of phase-mismatch.

    Main Methods:

    • Numerical and experimental demonstration of a two-crystal cascaded frequency tripling scheme.

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  • Theoretical analysis of temperature-insensitive phase-matching (PM) using LBO and BBO crystals.
  • Inclusion of air dispersion effects on phase-matching (PM) in numerical simulations.

    • Main Results:

    • The proposed two-crystal scheme significantly improves temperature acceptance of phase-matching (PM) by approximately 1.5 times compared to a single crystal.
    • Experimental validation using LBO and BBO crystals confirmed the enhanced temperature tolerance.
    • Numerical simulations explored the application potential in high-average power regimes, considering realistic crystal parameters and air dispersion.

    Conclusions:

    • The demonstrated two-crystal tripling scheme offers a promising approach for achieving high-average power third-harmonic generation (THG) in the UV region.
    • This method enhances the temperature stability of phase-matching (PM), making UV laser systems more robust.
    • The findings pave the way for more practical and efficient UV laser sources.