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Design and performance of diffractive optics for custom laser resonators.

J R Leger, D Chen, G Mowry

    Applied Optics
    |November 6, 2010
    PubMed
    Summary

    Diffractive optical elements enable precise control over optical resonator modes. This study demonstrates their use in creating specific fundamental mode profiles with high discrimination against unwanted higher-order modes.

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    Area of Science:

    • Optics
    • Photonics
    • Optical Engineering

    Background:

    • Optical resonators are fundamental in laser systems and optical measurements.
    • Controlling the spatial profile and mode purity of light within a resonator is crucial for many applications.
    • Diffractive optical elements (DOEs) offer a flexible platform for manipulating light wavefronts.

    Purpose of the Study:

    • To investigate the use of diffractive optical elements (DOEs) as end mirrors and internal phase plates in optical resonators.
    • To analyze how DOE design parameters influence resonator mode properties, including fundamental mode shape, loss, and modal discrimination.
    • To demonstrate a diffractive resonator design capable of supporting a specific fundamental mode with high selectivity.

    Main Methods:

    • Utilizing diffractive optical elements as end mirrors to generate desired real-mode profiles.
    • Employing two diffractive mirrors for complex mode profile generation.
    • Simulating and analyzing the effects of diffractive mirror feature size and phase quantization on mode characteristics.
    • Incorporating additional transparent phase plates to enhance modal discrimination.
    • Designing and evaluating a 10-cm-long diffractive resonator.

    Main Results:

    • A single diffractive end mirror can produce arbitrary real-mode profiles.
    • Two diffractive mirrors enable the generation of complex spatial mode profiles.
    • Diffractive mirror parameters significantly impact fundamental mode shape, loss, and higher-order mode discrimination.
    • Transparent phase plates improve modal discrimination but reduce fabrication tolerances.
    • A demonstrated 10-cm diffractive resonator supports an 8.5-mm-wide fundamental mode with 25% second-order mode discrimination and minimal fundamental mode loss.

    Conclusions:

    • Diffractive optical elements are effective components for tailoring optical resonator modes.
    • DOE design offers a powerful method for achieving high modal discrimination and specific beam profiles.
    • The presented diffractive resonator design shows promise for applications requiring high mode purity and specific beam characteristics.

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