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Optical truss interferometer for the LISA telescope.

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    The Laser Interferometer Space Antenna requires extreme optical stability. A new fiber-based cavity injection system and optical truss interferometer were developed for ground testing and risk mitigation.

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    Area of Science:

    • Optics and interferometry
    • Astrophysical instrumentation
    • Precision engineering

    Background:

    • The Laser Interferometer Space Antenna (LISA) mission demands unprecedented optical path length stability (picometer/sqrt(Hz)) in the mHz band.
    • Ground testing and flight unit risk mitigation are critical for LISA's success.
    • Existing methods may not fully address the stringent stability requirements for space-based interferometers.

    Purpose of the Study:

    • To design and develop a fiber-based cavity injection system for an optical truss interferometer.
    • To create a system for ground testing LISA telescopes and mitigating flight risks.
    • To validate the performance of prototype optical truss cavities through sensitivity analysis.

    Main Methods:

    • Designed and developed a compact, fiber-based cavity injection system integrating fiber optics, mode-matching optics, and cavity input mirrors.
    • Paired input stages with return mirror stages to form optical truss cavities for mounting on telescopes.
    • Conducted comprehensive sensitivity analysis using various simulation methods.

    Main Results:

    • Successfully designed and developed a novel fiber-based cavity injection system.
    • Demonstrated the feasibility of optical truss cavities for monitoring structural displacements.
    • Simulations indicated satisfactory performance for three first-generation prototype cavities.

    Conclusions:

    • The developed fiber-based cavity injection system is a viable component for optical truss interferometers.
    • The optical truss interferometer serves as a valuable tool for LISA telescope ground testing and risk mitigation.
    • Prototype cavities show promising performance, supporting future fabrication and assembly.