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Hybrid stable-unstable resonators for diffusion-cooled CO(2) slab lasers.

A Lapucci, A Labate, F Rossetti

    Applied Optics
    |November 25, 2010
    PubMed
    Summary

    We compared two hybrid stable-unstable resonators for diffusion-cooled carbon dioxide (CO2) slab lasers. The negative-branch resonator demonstrated superior performance in power extraction and beam quality compared to the positive-branch design.

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    Area of Science:

    • Laser Physics
    • Optical Engineering

    Background:

    • Diffusion-cooled carbon dioxide (CO2) slab lasers offer efficient gas laser operation.
    • Hybrid stable-unstable resonators are crucial for optimizing laser performance and beam quality.

    Purpose of the Study:

    • To numerically and experimentally compare the performance of two hybrid stable-unstable resonators for CO2 slab lasers.
    • To evaluate resonators with positive- and negative-branch unstable schemes within a specific rf-discharge channel.

    Main Methods:

    • Numerical simulations and experimental characterization of resonator performance.
    • Analysis of modal structure, power extraction efficiency, resonator stability, and output beam quality.
    • Design and implementation of resonators for a 320 mm × 60 mm ×2 mm rf-discharge channel.

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    Main Results:

    • The negative-branch unstable resonator scheme exhibited higher power extraction efficiency.
    • The negative-branch resonator also provided a higher quality extracted beam compared to the positive-branch scheme.
    • Both resonator designs were stable and guided within the narrow transverse direction of the slab laser.

    Conclusions:

    • The negative-branch hybrid stable-unstable resonator is a more effective design for diffusion-cooled CO2 slab lasers.
    • This study provides valuable insights for the design and optimization of high-power gas lasers.
    • Further research could explore variations in resonator geometry and discharge parameters.