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Coherent light filter.

Morgan Bergthold, Keith Stewart, Nicholas Duggar

    Optics Letters
    |June 1, 2022
    PubMed
    Summary

    This study presents a novel method for filtering coherent laser light from broadband thermal sources using a Michelson interferometer. The technique achieves significant signal suppression, enabling clearer measurements of incoherent thermal emission.

    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Spectroscopy

    Background:

    • Coherent light from lasers can overwhelm sensitive detectors when measuring broadband incoherent sources.
    • Distinguishing between coherent and incoherent light is crucial for various scientific applications.

    Purpose of the Study:

    • To demonstrate an efficient method for filtering coherent light from a broad spectral background.
    • To enable the measurement of spatially dependent thermal emission in the presence of strong coherent signals.

    Main Methods:

    • Utilizing a Michelson interferometer to selectively filter coherent mid-infrared laser emission.
    • Employing the filter to remove overpowering coherent signals from detection systems.

    Main Results:

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    • Achieved coherent light suppression of up to 16.9 dB.
    • Demonstrated the ability to measure spatially dependent thermal emission from a patterned surface.
    • The filter proved to be rapidly tunable and wavelength-flexible.

    Conclusions:

    • The developed Michelson interferometer-based filter effectively separates coherent and incoherent light.
    • This technology has significant potential for advanced imaging and spectroscopy applications.