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Measuring the linear optical absorption coefficient by interferometry and the thermal lensing effect: a numerical

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    This study introduces a pump-probe thermal lensing method using interferometry to measure liquid absorption coefficients. The technique accurately determines optical properties by analyzing photothermal effects and interferograms.

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    Area of Science:

    • * Optical Physics
    • * Photothermal Spectroscopy
    • * Laser-Induced Effects

    Background:

    • * Accurate measurement of linear absorption coefficients is crucial for understanding liquid properties.
    • * Traditional methods may lack sensitivity or require complex setups.
    • * Photothermal techniques offer non-contact and sensitive optical property measurements.

    Purpose of the Study:

    • * To develop and validate a novel pump-probe thermal lensing method for determining the linear absorption coefficient of liquids.
    • * To utilize interferometry and numerical analysis for enhanced measurement precision.
    • * To establish a sensitive and efficient technique for liquid optical characterization.

    Main Methods:

    • * Employing a pump-probe setup where a pump beam induces a localized photothermal effect in the liquid.
    • * Utilizing a Mach-Zehnder interferometer to capture interferograms generated by the photothermal effect.
    • * Applying numerical analysis to experimental data (three digital photographs) to calculate photothermal phase difference and pump beam irradiance distribution.

    Main Results:

    • * A linear dependence was observed between the photothermal phase difference and the spatial distribution of the pump beam irradiance.
    • * The linear absorption coefficient was successfully obtained from this linear relationship.
    • * The method demonstrated high sensitivity (λ/1500) and was validated with ethanol, methanol, and carbon disulfide.

    Conclusions:

    • * The developed pump-probe thermal lensing method provides an accurate and sensitive approach for measuring the linear absorption coefficient of liquids.
    • * The integration of interferometry and numerical analysis offers a robust platform for optical characterization.
    • * This technique holds potential for various applications requiring precise liquid optical property measurements.