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    Area of Science:

    • Materials Science
    • Spectroscopy
    • Physical Chemistry

    Background:

    • Time-resolved spectroscopy, particularly transient absorption, typically offers femtosecond resolution over nanosecond windows.
    • Existing methods to probe slower dynamics (milliseconds+) are often complex, costly, or lack broadband spectral coverage.

    Purpose of the Study:

    • To develop an accessible and broadband transient absorption technique for studying slow material dynamics.
    • To achieve millisecond measurement windows with high spectral resolution.

    Main Methods:

    • Utilized an ultra-short pulse laser as the pump and a broadband incoherent continuous-wave light source as the probe.
    • Employed a fast photodiode, monochromator, and oscilloscope for time-resolved detection.
    • Achieved spectral resolution of <2 nm across the 0.4–2 µm range.

    Main Results:

    • Developed a transient absorption technique with ~1 ns time resolution and millisecond measurement windows.
    • Demonstrated broadband spectral coverage from 0.4 to 2 µm with <2 nm spectral resolution.
    • Showcased the setup's capability for time- and spectrally-resolved photoluminescence measurements.

    Conclusions:

    • The proposed technique offers a cost-effective and versatile approach for studying slow material dynamics.
    • This method bridges the gap between ultrafast spectroscopy and slower dynamic processes.
    • The setup provides valuable insights into material behavior over extended timescales.