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Related Experiment Videos

Forward and inverse solutions for three-element Risley prism beam scanners.

Anhu Li, Xingsheng Liu, Wansong Sun

    Optics Express
    |April 7, 2017
    PubMed
    Summary

    A novel three-prism system design eliminates scan blind zones in beam scanning. This advancement also resolves control singularity issues, enabling continuous prism motion for improved performance.

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    Area of Science:

    • Optical Engineering
    • Beam Steering Systems
    • Geometric Optics

    Background:

    • Double-prism Risley systems face limitations like scan blind zones and control singularities.
    • These issues adversely affect overall beam scanning performance and stability.

    Purpose of the Study:

    • To develop a theoretical model for a three-prism Risley system.
    • To eliminate scan blind zones and overcome control singularities in beam scanning.

    Main Methods:

    • Geometric derivation to determine the critical condition for eliminating scan blind zones.
    • Damped least-squares iterative refinement with forward ray tracing for inverse solutions.
    • Numerical differentiation to enhance the efficiency of iterative calculations.

    Main Results:

    • Established formulae for three-Risley-prism system design.
    • Successfully derived inverse solutions for the three-prism system.
    • Demonstrated that conditioning the motion law of one prism ensures continuous motion for the others.

    Conclusions:

    • A three-prism system effectively eliminates scan blind zones.
    • Control singularity is overcome by conditioning prism motion laws.
    • The proposed system offers enhanced and stable beam scanning capabilities.

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