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Interferometric wavefront sensing with a single diode using spatial light modulation.

D Tarquin Ralph, Paul A Altin, David S Rabeling

    Applied Optics
    |April 5, 2017
    PubMed
    Summary
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    A novel optical interferometer alignment technique uses a single photodiode and spatial light modulator (SLM) for precise wavefront sensing. This method offers improved common-mode rejection and can detect higher-order errors, simplifying complex optical systems.

    Area of Science:

    • Optical Engineering
    • Interferometry
    • Wavefront Sensing

    Background:

    • Conventional wavefront sensing systems often rely on multielement photodiodes.
    • These systems can be susceptible to low-frequency errors.
    • Alignment sensing is critical for the performance of optical interferometers.

    Purpose of the Study:

    • To introduce a new technique for fine alignment sensing in optical interferometers.
    • To demonstrate a simplified and more robust approach compared to conventional methods.
    • To enable sensing of higher-order wavefront errors.

    Main Methods:

    • Utilizes a single-element photodiode in conjunction with a spatial light modulator (SLM).
    • Employs digitally enhanced heterodyne interferometry.

    Related Experiment Videos

  • Signals pass through a single photodetection and analog path for enhanced common-mode rejection.

    • Main Results:

    • Experimental demonstration of the technique's efficacy.
    • Comparison of performance against a conventional heterodyne wavefront sensing system.
    • Achieved high common-mode rejection, mitigating low-frequency errors.

    Conclusions:

    • The new technique offers a simplified and potentially more accurate method for optical interferometer alignment.
    • It shows promise for improving alignment systems in space-based interferometers like LISA.
    • The method allows for optimization of laser cavity power, surpassing traditional segmented diode limitations.