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Updated: Feb 15, 2026

Implementation of a Reference Interferometer for Nanodetection
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NPRO laser feedback interferometer with improved sensitivity.

Wenxun Li, Chunzhao Ma, Weitong Fan

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    |February 13, 2026
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces active magnetic stabilization for non-planar ring oscillator laser feedback interferometers, significantly improving frequency stability and enabling precise vibration detection even in noisy environments.

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    Area of Science:

    • Optics and Photonics
    • Precision Measurement
    • Vibration Sensing

    Background:

    • Non-planar ring oscillator laser feedback interferometers (NPRO-LFI) offer sub-picometer vibration detection.
    • External magnetic noise limits NPRO-LFI frequency stability and high-precision applications.

    Purpose of the Study:

    • To develop an active magnetic stabilization technique for NPRO-LFI.
    • To enhance frequency stability and expand the application range of NPRO-LFI.

    Main Methods:

    • Implemented an active magnetic stabilization system using an electromagnet.
    • Employed closed-loop control for stabilized self-mixing frequency (SMF).
    • Evaluated vibration detection capabilities and rotational speed measurement accuracy.

    Main Results:

    • Achieved a magnetic noise suppression ratio of 10^5 at 1 mHz for a 614 kHz SMF.
    • Enabled vibration detection from 4 Hz to 100 kHz with <0.17 Hz deviation.
    • Demonstrated a weak-light detection limit of 12.2 fW and 1.53% error in rotational speed measurements.

    Conclusions:

    • Active magnetic stabilization significantly improves NPRO-LFI performance in noisy environments.
    • The enhanced NPRO-LFI system enables high-precision, long-range sensing under weak feedback.
    • This advancement broadens the applicability of NPRO-LFI in demanding measurement scenarios.