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Updated: Jun 12, 2026

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Variable reflectivity unstable resonators for coherent laser radar emitters.

A Parent, P Lavigne

    Applied Optics
    |June 16, 2010
    PubMed
    Summary

    Comparing mirror couplers in a carbon dioxide (CO2) laser resonator, Gaussian profiles maximize far-field intensity, while parabolic profiles offer uniform near fields. Both are suitable for coherent laser detection and ranging (ladar) systems.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Resonator Design

    Background:

    • Carbon dioxide (CO2) lasers are widely used in industrial and scientific applications.
    • The performance of a laser resonator is significantly influenced by the reflectivity profiles of its mirrors.
    • Graded reflectivity mirrors (GRMs) offer tunable beam profiles compared to traditional uniform reflectivity mirrors.

    Purpose of the Study:

    • To compare the beam properties of a TE CO2 laser.
    • To evaluate the impact of different graded reflectivity mirror couplers on beam characteristics.
    • To determine the suitability of various mirror configurations for coherent ladar applications.

    Main Methods:

    • Experimental setup utilizing a TE CO2 laser.
    • Implementation of a Cassegrain resonator configuration.
    • Employing various graded reflectivity mirror couplers with distinct profiles (Gaussian and parabolic).
    • Characterization of near-field and far-field beam properties.

    Main Results:

    • Gaussian profiles experimentally maximized far-field intensity.
    • Parabolic profiles resulted in more uniform near-field beam distributions.
    • Parabolic profiles exhibited lower energy extraction efficiency compared to Gaussian profiles.
    • Both Gaussian and parabolic mirror configurations demonstrated suitability for coherent ladar.

    Conclusions:

    • The choice of mirror coupler profile in a Cassegrain resonator impacts CO2 laser beam characteristics.
    • Gaussian mirrors are optimal for maximizing far-field intensity, crucial for long-range applications.
    • Parabolic mirrors provide beam uniformity in the near-field, potentially beneficial for specific imaging tasks.
    • Both mirror types show promise for coherent ladar systems, with selection depending on specific system requirements.

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