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    This study presents a high-power UV-pumped BBO optical parametric oscillator (OPO). Increasing the BBO crystal temperature boosted output power to 2.17 W, achieving the highest power for this OPO type.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Materials Science

    Background:

    • Optical Parametric Oscillators (OPOs) are crucial for generating tunable laser light.
    • Barium Borate (BBO) crystals are widely used nonlinear media in OPOs.
    • Color center formation in BBO crystals can limit OPO performance and power.

    Purpose of the Study:

    • To enhance the output power of a UV-pumped BBO OPO.
    • To investigate the effect of increased operating temperature on BBO crystal performance.
    • To achieve the highest output power for a 355 nm UV-pumped II-type critical phase-matched BBO OPO.

    Main Methods:

    • Utilized a UV-pumped BBO optical parametric oscillator.
    • Increased the working temperature of the BBO nonlinear crystal from 135 °C to 185 °C.
    • Measured output power, repetition rate, pulse width, and signal wavelength tuning.

    Main Results:

    • Output power increased from 1.20 W to 2.17 W with temperature elevation.
    • Signal light wavelength was tuned from 409.81 nm to 581.87 nm.
    • Achieved 10 kHz repetition rate and 5.23 ns pulse width for the signal light.

    Conclusions:

    • Increasing BBO crystal temperature effectively reduces color center density and enhances OPO output power.
    • The developed BBO OPO demonstrates record high output power for its configuration.
    • Results offer significant potential for industrial and scientific applications requiring high-power tunable UV sources.