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    Area of Science:

    • Spectroscopy
    • Optics
    • Acoustics

    Background:

    • Optical absorption spectroscopy is crucial for material analysis.
    • Traditional methods often require direct contact or specific sample preparation.
    • Analyzing large or opaque samples presents significant challenges.

    Purpose of the Study:

    • To develop and characterize a remote optical absorption spectroscopy technique.
    • To enable non-contact measurement of optical absorption spectra.
    • To analyze samples previously inaccessible to standard spectroscopic methods.

    Main Methods:

    • Utilizing photoacoustic remote sensing detection.
    • Employing a nanosecond tunable excitation source (210-680 nm).
    • Reading elasto-optic modulations via a 1310 nm continuous-wave detection beam.
    • Performing reflection-mode measurements at an 8 mm working distance.

    Main Results:

    • Successfully captured absorption spectra of dyes and biological macromolecules.
    • Demonstrated remote optical absorption measurement without containment or acoustic detectors.
    • Achieved optical absorption contrast through thermo-elastic pressure-induced modulations.

    Conclusions:

    • The developed photoacoustic remote sensing technique offers a viable method for remote optical absorption spectroscopy.
    • This technique expands the possibilities for analyzing diverse and challenging sample types.
    • Further investigation into the technique's characteristics is warranted for broader applications.