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Gas-lens effect in kW-class thin-disk lasers.

A Diebold, F Saltarelli, I J Graumann

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    Summary
    This summary is machine-generated.

    We discovered a gas-lens effect in high-power thin-disk lasers, contributing significantly to thermal lensing. Operating in vacuum eliminates this effect, extending the optimal beam quality range by 70%.

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    Area of Science:

    • Laser Physics
    • Optics
    • Thermal Management

    Background:

    • High-power thin-disk lasers are crucial for various applications.
    • Thermal lensing is a significant limitation in achieving high beam quality at high power levels.
    • The influence of the surrounding gas on laser performance is not fully understood.

    Purpose of the Study:

    • To identify and quantify the gas-lens effect in kW-class thin-disk lasers.
    • To investigate the impact of operating environment (air, vacuum, helium) on thermal lensing and beam quality.
    • To develop a numerical model for predicting gas-lens and gas-wedge effects in thin-disk systems.

    Main Methods:

    • Experimental investigation of a kW-class thin-disk laser operating in air, helium, and vacuum.
    • Development of a numerical model incorporating heat transfer and gas lensing.
    • Validation of the model against experimental results.

    Main Results:

    • The gas-lens effect accounts for 33% of the total thermal lensing in experiments.
    • Operating in vacuum or helium significantly reduces thermal lensing compared to air.
    • Single-transverse-mode operation (M² < 1.1) was achieved over a 70% broader power range (300 W to 800 W) in vacuum/helium.
    • The numerical model accurately reproduced experimental findings and predicted the gas-wedge effect.

    Conclusions:

    • The gas-lens effect is a critical factor limiting power scaling in thin-disk lasers.
    • Eliminating the gas-lens effect by operating in vacuum or inert gas is essential for extending the operational range of high-quality beams.
    • The developed numerical model provides a valuable tool for understanding and mitigating gas-related thermal effects in thin-disk laser systems.