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Spatially resolved photodiode response for simulating precise interferometers.

Germán Fernández Barranco, Michael Tröbs, Vitali Müller

    Applied Optics
    |August 25, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Quadrant photodiodes (QPDs) precisely measure laser interferometry displacements and angular misalignment. Their spatially resolved response characterization confirms that device nonuniformities and crosstalk do not significantly impact measurements.

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    Area of Science:

    • Optical physics
    • Metrology
    • Space instrumentation

    Background:

    • Quadrant photodiodes (QPDs) are crucial for laser interferometry, enabling measurement of longitudinal displacement and angular misalignment via differential wavefront sensing (DWS).
    • Accurate characterization of QPDs is essential for optimizing performance in sensitive applications like space-based interferometry.

    Purpose of the Study:

    • To develop a method for obtaining the spatially resolved response of QPDs.
    • To integrate this measured response into optical simulations for accurate prediction of longitudinal and DWS phase observables.
    • To characterize commercial QPDs for space-based interferometry applications.

    Main Methods:

    • A setup was developed to measure the spatially resolved response of QPDs.
    • The IfoCAD simulation software was extended to incorporate measured QPD responses.
    • Three commercial QPDs were characterized, and one's measured response was used in optical simulations.

    Main Results:

    • The study successfully obtained and utilized spatially resolved QPD response data in simulations.
    • Optical simulations incorporating measured QPD response predicted longitudinal and DWS phase observables accurately.
    • Nonuniformities and crosstalk in QPD response did not significantly alter longitudinal and DWS measurands compared to ideal devices.

    Conclusions:

    • The developed method allows for accurate prediction of QPD performance in laser interferometry systems.
    • Commercial QPDs exhibit characteristics that do not critically degrade performance in longitudinal and DWS measurements.
    • This work validates the use of characterized QPDs in advanced optical simulations for space applications.