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Updated: Jun 22, 2026

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Microchip-laser polarization control by destructive-interference resonant-grating mirror.

F Pigeon, J C Pommier, S Reynaud

    Optics Express
    |June 18, 2009
    PubMed
    Summary

    A novel resonant grating mirror polarizes a Nd:YAG microchip laser, achieving high extinction ratios. This new design offers comparable performance to gratingless lasers for efficient polarized output.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Nd:YAG microchip lasers are widely used but often produce unpolarized or partially polarized output.
    • Achieving high polarization extinction ratios is crucial for many laser applications.
    • Existing methods for polarizing microchip lasers can be complex or inefficient.

    Purpose of the Study:

    • To develop and demonstrate a novel output coupler for monolithic polarization of Nd:YAG microchip lasers.
    • To achieve high polarization extinction ratios over the full emission bandwidth.
    • To evaluate the performance of the polarized laser compared to non-polarized systems.

    Main Methods:

    • Design and fabrication of a resonant grating submirror monolithically integrated with a standard multilayer submirror.

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  • Utilizing intra-mirror destructive interference to suppress undesired polarization states.
  • Characterization of the laser output, including polarization extinction ratio and pulse energy.

    • Main Results:

    • Linear polarization of Nd:YAG microchip laser emission over its full bandwidth was achieved.
    • A polarization extinction ratio exceeding 25 dB was obtained for pulse energies up to 6.1 microJ.
    • The performance of the passively Q-switched polarized laser was comparable to gratingless, non-polarized microchip lasers.

    Conclusions:

    • The developed resonant grating output coupler effectively polarizes Nd:YAG microchip lasers.
    • This monolithic design offers a simple and efficient solution for generating high-quality polarized laser emission.
    • The approach maintains excellent laser performance, making it suitable for various applications requiring polarized light.