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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Advanced phasemeter for deep phase modulation interferometry.

Thomas S Schwarze, Oliver Gerberding, Felipe Guzmán Cervantes

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    Summary
    This summary is machine-generated.

    We developed an advanced phasemeter for precise length measurements using deep phase modulation interferometry. This system achieves high dynamic range and sensitivity, enabling sub-picometer optical path length measurements.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Interferometry

    Background:

    • Deep phase modulation interferometry offers precise length measurements with minimal hardware.
    • High dynamic range is crucial for many interferometric applications.
    • Advanced phasemeter development is needed to improve sensitivity and accuracy.

    Purpose of the Study:

    • To develop an advanced phasemeter for deep phase modulation interferometry.
    • To achieve precise length measurements with a high dynamic range.
    • To analyze and suppress non-linear noise sources in the phasemeter design.

    Main Methods:

    • Utilized fast Analog-to-Digital Converters (ADCs) and Field-Programmable Gate Arrays (FPGAs).
    • Implemented multiple single-bin Fourier transforms at high sampling rates.
    • Conducted a null measurement using an optical beatnote signal at λ = 1064nm.

    Main Results:

    • Achieved a sensitivity of 0.8μrad/√Hz below 10Hz and 13.3μrad/√Hz above 10Hz.
    • Demonstrated a large dynamic range in the null measurement.
    • Potential for optical path length sensitivities down to 0.14pm/√Hz and 2.3pm/√Hz.

    Conclusions:

    • The advanced phasemeter enables highly sensitive and accurate length measurements.
    • The developed system is suitable for applications requiring high dynamic range interferometry.
    • Further improvements in optical path length measurement sensitivity have been demonstrated.