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Modular pump geometry for diode side-pumped high-power Nd:YAG rod laser.

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    This study introduces novel modular diode-pumped laser designs for high-power continuous-wave (CW) lasers. A 60° rotated configuration demonstrated superior performance in thermal lensing and beam quality.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Diode-pumped solid-state lasers are crucial for high-power applications.
    • Efficient pumping configurations are essential for optimizing laser performance and managing thermal effects.
    • Existing modular designs lack flexibility in pump diode angular separation.

    Purpose of the Study:

    • To present a novel modular design for side-pumping an Nd:YAG rod in a diode-pumped high-power CW laser.
    • To investigate the impact of different modular pump geometries on laser performance.
    • To compare the thermal lensing, fluorescence, beam profile, and beam quality (M2) of various configurations.

    Main Methods:

    • Developed independent disc modules with three-diode linear bar arrays arranged at 120°.
    • Assembled modules along the Nd:YAG rod with varying angular separations to create helical, 60° rotated, and linear geometries.
    • Analyzed thermal lensing, fluorescence profiles, laser beam profiles, and beam quality factor (M2) for each geometry.

    Main Results:

    • The 60° rotated configuration exhibited the best overall performance compared to helical and linear geometries.
    • Significant differences in thermal lensing and beam quality were observed across the tested configurations.
    • The modular design allowed for systematic study of angular separation effects.

    Conclusions:

    • The 60° rotated modular pump geometry offers superior performance for diode-pumped high-power CW lasers.
    • This novel approach provides a flexible platform for optimizing laser design through controlled pump diode arrangement.
    • This work represents the first exploration of such modular pump geometries with adjustable angular separation.