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Classification of single-mode laser emission based on interferograms measured using a Fizeau wavemeter.

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    |August 12, 2025
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    Summary
    This summary is machine-generated.

    A new method uses a commercial wavemeter to classify laser light as single-mode or multi-mode. This technique offers high specificity for optical interferometry applications, improving detection sensitivity.

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    Area of Science:

    • Optical physics
    • Laser technology
    • Metrology

    Background:

    • High Q-factor etalons in optical interferometry demand single longitudinal mode (SLM) light sources for optimal detection sensitivity.
    • Characterizing laser output typically involves external instruments like spectrometers or optical spectrum analyzers.

    Purpose of the Study:

    • To develop and validate a novel method for classifying laser output as single-mode or multi-mode using a commercial wavemeter.
    • To assess the efficacy of heuristic metrics applied to wavemeter-generated interferograms for mode classification.

    Main Methods:

    • Interferograms from a commercial Fizeau interferometer-based wavemeter were analyzed using heuristic metrics.
    • The method was validated on external cavity diode lasers (ECDLs) in the visible and near-infrared spectra.
    • Results were cross-referenced with measurements from optical spectrum analyzers, spectrometers, and a scanning Fabry-Perot interferometer.

    Main Results:

    • The wavemeter-based heuristic metric approach successfully classified laser emissions as single-mode or multi-mode with high specificity.
    • Validation confirmed the method's reliability across different laser types and wavelengths.
    • The technique was successfully applied to an interferometric ultrasound sensor for acoustic transient measurement.

    Conclusions:

    • A commercial wavemeter, when analyzed with heuristic metrics, provides a viable and specific method for classifying laser emission modes.
    • This approach offers advantages in applications requiring high spectral resolution, rapid data acquisition, and reliable single-mode classification.
    • The method demonstrates practical utility in fields like optical sensing and metrology.