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Updated: Nov 12, 2025

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Fiber-based stray light suppression in spectroscopy using periodic shadowing.

Miaoxin Gong, Haisol Kim, Jim Larsson

    Optics Express
    |March 17, 2021
    PubMed
    Summary

    A new fiber-based periodic shadowing technique significantly reduces stray light interference in spectroscopic measurements. This method improves the accuracy of Raman spectroscopy, enabling better molecular identification and analysis in combustion studies.

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    Area of Science:

    • Spectroscopy
    • Optical Engineering
    • Combustion Science

    Background:

    • Stray light is a major interference in spectroscopic measurements, originating from scattered or unintended photons.
    • This interference degrades spectral quality, hindering accurate molecular analysis.

    Purpose of the Study:

    • To present a general experimental solution for suppressing stray light in spectroscopic measurements.
    • To improve the accuracy and applicability of techniques like Raman spectroscopy.

    Main Methods:

    • Introduction of a customized fiber for signal collection featuring a periodically arranged fiber array.
    • Integration of lock-in analysis with the fiber-based periodic shadowing technique.
    • Application of the method to Raman spectroscopy in combustion using a high-power laser system.

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    Main Results:

    • Demonstrated reduction of stray light levels by up to a factor of 80.
    • Enabled the distinction of weak spectral lines, leading to improved molecular species identification.
    • Facilitated more accurate concentration and temperature evaluations.

    Conclusions:

    • The fiber-based periodic shadowing method is a feasible and efficient tool for stray light suppression.
    • The technique significantly enhances spectroscopic accuracy in practical applications.
    • This method offers a general solution for improving spectroscopic measurements, particularly in challenging environments like combustion.