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ASE suppression in a thin-disk laser by optimizing reflectivity at an active element-heatsink interface.

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    Summary

    This study introduces a novel method to suppress amplified spontaneous emission (ASE) in thin-disk (TD) lasers by optimizing mirror reflectivity and heat sinks. This technique significantly boosts laser gain and stored energy without impacting beam quality.

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    Area of Science:

    • Laser Physics
    • Optical Engineering
    • Materials Science

    Background:

    • Amplified spontaneous emission (ASE) is a significant limiting factor in the performance of thin-disk (TD) lasers.
    • Managing ASE is crucial for enhancing laser gain and stored energy.

    Purpose of the Study:

    • To propose and validate a novel method for suppressing amplified spontaneous emission (ASE) in thin-disk (TD) lasers.
    • To investigate the impact of mirror reflectivity and active element-heatsink interfaces on ASE.

    Main Methods:

    • Developing optimized multilayer dielectric mirrors to reduce reflectivity at large incidence angles.
    • Implementing direct bonding or high refractive index glue for active element (AE) and heatsink integration.
    • Modeling the ASE effect and its dependence on mirror reflectivity profiles.

    Main Results:

    • Achieved nearly complete ASE suppression through optimized AE-heatsink interfaces.
    • Demonstrated significant increases in laser gain and stored energy.
    • Confirmed no adverse effects on signal and pump beams.

    Conclusions:

    • The proposed method effectively suppresses ASE in TD lasers.
    • Optimized mirror design and bonding techniques are key to enhancing laser performance.
    • This approach offers a pathway to significantly improve energy storage and gain in laser systems.