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Optical distortion in end-pumped solid-state rod lasers.

S B Sutton, G F Albrecht

    Applied Optics
    |September 22, 2010
    PubMed
    Summary
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    We analyzed thermo-optical effects in end-pumped lasers. Super-Gaussian pump profiles significantly impact spherical aberration, offering aberration-free operation for high-order profiles and defining thermal stress limits.

    Area of Science:

    • Laser Physics
    • Optical Engineering
    • Materials Science

    Background:

    • Thermo-optical effects are critical in high-power laser systems.
    • Understanding thermal distortions is key to laser performance and reliability.
    • End-pumped rod lasers are widely used but susceptible to thermal lensing.

    Purpose of the Study:

    • To investigate thermo-optical issues in mode-matched end-pumped lasers.
    • To develop scaling relations for optical distortions and thermal stress limits.
    • To analyze the impact of super-Gaussian pump profiles on laser performance.

    Main Methods:

    • Combined analytical and numerical methods.
    • Extraction of practical scaling relations.
    • Characterization of thermally induced optical distortions.

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  • Assessment of thermal-stress operating limits.

    • Main Results:

    • Thermally induced spherical aberration is overcorrected and depends strongly on super-Gaussian order.
    • Aberration-free operation is achievable for high-order radial profiles.
    • Scaling relations for optical distortions and thermal stress limits were derived.
    • Cavity stability was analyzed for a cavity length equal to the rod length.

    Conclusions:

    • Super-Gaussian pump profiles offer a method to control spherical aberration in end-pumped lasers.
    • High-order super-Gaussian profiles can lead to significant aberration-free beam portions.
    • The study provides essential data for designing robust and efficient laser systems.