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Active annular-beam laser autocollimator system.

P R Yoder, E R Schlesinger, J L Chickvary

    Applied Optics
    |February 16, 2010
    PubMed
    Summary
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    A novel autocollimator system uses an axicon and beam expander to create a high-ratio annular beam. This system dynamically maintains alignment despite mirror vibrations, crucial for optical systems.

    Area of Science:

    • Optical Engineering
    • Laser Metrology
    • Precision Measurement

    Background:

    • Autocollimation is vital for aligning optical systems.
    • Maintaining alignment with vibrating components presents significant challenges.
    • Existing methods may lack the precision or dynamic range for certain applications.

    Purpose of the Study:

    • To develop an advanced autocollimator system capable of generating a high-quality annular beam.
    • To implement a dynamic servo system for maintaining precise beam alignment.
    • To address challenges posed by angular vibrations in the target mirror.

    Main Methods:

    • Utilized an axicon and beam expander telescope to generate a 12.5-cm outer diameter annular beam.
    • Developed a two-axis, electromagnetically actuated mirror assembly for dynamic alignment control.

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  • Implemented a servo system to counteract angular vibratory motions up to 7 mrad below 300 Hz.

    • Main Results:

    • Successfully generated a helium-neon laser annular beam with a high diameter-to-width ratio (25:1).
    • Achieved automatic acquisition and dynamic maintenance of autocollimation.
    • Demonstrated effective beam alignment control despite significant angular vibrations.

    Conclusions:

    • The developed autocollimator system offers robust performance in dynamic and vibratory environments.
    • The combination of optical design and advanced servo control enables high-precision alignment.
    • This technology is applicable to demanding optical alignment tasks requiring stability and accuracy.