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    We developed a compact mid-infrared multidimensional spectroscopy technique using a calomel acousto-optic filter. This method enables efficient 2D spectral slice measurements, demonstrated on carboxy-hemoglobin.

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    Area of Science:

    • Physical Chemistry
    • Spectroscopy
    • Materials Science

    Background:

    • Multidimensional spectroscopy provides detailed insights into molecular dynamics.
    • Existing methods often require complex setups or have limitations in spectral resolution or accessibility.
    • Mid-infrared spectroscopy is crucial for probing molecular vibrations.

    Purpose of the Study:

    • To introduce a novel, compact acousto-optic programmable dispersive filter for mid-infrared multidimensional spectroscopy.
    • To demonstrate the feasibility of a frequency-domain approach for measuring 2D spectral slices.
    • To showcase the application of this technique in analyzing the spectro-temporal properties of carboxy-hemoglobin.

    Main Methods:

    • Utilized a calomel-based acousto-optic programmable dispersive filter for spectral manipulation.
    • Employed a frequency-domain approach for multidimensional spectral acquisition.
    • Implemented the technique within a standard pump-probe spectroscopy setup.

    Main Results:

    • Achieved compact implementation of multidimensional spectroscopy in the mid-infrared.
    • Enabled straightforward measurement of 2D slices of multidimensional spectra.
    • Successfully measured the three spectro-temporal dimensions of carboxy-hemoglobin's mid-infrared spectrum.

    Conclusions:

    • The calomel-based acousto-optic filter offers a compact and practical solution for mid-infrared multidimensional spectroscopy.
    • The frequency-domain approach simplifies the acquisition of specific spectral slices.
    • This technique provides a valuable tool for studying molecular dynamics, as demonstrated with carboxy-hemoglobin.