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    A new method effectively removes instabilities in high-finesse optical resonators caused by thermoelastic deformation. This technique enables stable operation at high average powers, crucial for particle accelerators.

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    Area of Science:

    • Optics
    • Laser Physics
    • Materials Science

    Background:

    • High-finesse optical resonators are susceptible to modal instabilities.
    • Thermoelastic deformation is a primary cause of these instabilities, limiting performance.
    • Applications in particle accelerators and high-power lasers require stable resonator operation.

    Purpose of the Study:

    • To present and experimentally validate a novel method for suppressing modal instabilities in optical resonators.
    • To demonstrate the applicability of this method to compact, multi-mirror cavities.
    • To confirm the method's effectiveness at high intracavity average power levels.

    Main Methods:

    • Development of an experimental technique to counteract thermoelastic deformation-induced modal instabilities.
    • Implementation and testing in multi-mirror folded monolithic and compact optical cavities.
    • Operation and characterization at high intracavity average power.

    Main Results:

    • Successful suppression of modal instabilities was achieved.
    • The method proved effective in compact, multi-mirror resonator configurations.
    • Stable operation at 200 kW intracavity average power was demonstrated.

    Conclusions:

    • The presented method offers a robust solution for mitigating modal instabilities in optical resonators.
    • This technique is suitable for demanding environments like particle accelerators and high-power laser systems.
    • The successful demonstration at 200 kW average power validates its scalability for high-power applications.