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Cartesian blind spot correction using two non-equal Risley elements.

Joshua K Lentz, Alec W Letsinger

    Applied Optics
    |October 6, 2021
    PubMed
    Summary

    This study presents a novel Risley prism system using two non-equal prisms to eliminate Cartesian blind spots. This method simplifies systems but introduces an angular blind spot, offering utility for specific applications.

    Area of Science:

    • Optical Engineering
    • Optics
    • Prism Systems

    Background:

    • Traditional Risley prism systems use identical prisms for beam steering.
    • Element separation in these systems creates an inaccessible output blind spot.
    • Previous solutions for blind spots increased system complexity and size.

    Purpose of the Study:

    • To present an alternative Risley prism configuration to address system blind spots.
    • To investigate a method that reduces system complexity compared to existing solutions.

    Main Methods:

    • Utilized two non-equal Risley prisms instead of identical ones.
    • Analyzed the trade-offs in blind spot correction in Cartesian and angular spaces.

    Main Results:

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    • The proposed system successfully overcomes the blind spot in Cartesian space.
    • A blind spot is introduced in angular space as a trade-off.
    • This configuration offers significant advantages for specific Risley prism applications.

    Conclusions:

    • The use of two non-equal Risley prisms provides a viable alternative for blind spot correction.
    • This method simplifies optical systems by avoiding additional elements.
    • The trade-off of an angular blind spot is acceptable for certain applications.