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Broadband 7-fs diffractive-optic-based 2D electronic spectroscopy using hollow-core fiber compression.

Xiaonan Ma, Jakub Dostál, Tobias Brixner

    Optics Express
    |September 9, 2016
    PubMed
    Summary

    We developed a new noncollinear coherent two-dimensional electronic spectroscopy technique using broadband pulses. This method provides high-resolution quantum beating data for molecular dynamics studies.

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    Area of Science:

    • Physical Chemistry
    • Spectroscopy
    • Quantum Optics

    Background:

    • Coherent two-dimensional electronic spectroscopy (2D ES) is a powerful technique for probing ultrafast molecular dynamics.
    • Previous 2D ES methods often faced limitations in spectral bandwidth and temporal resolution.
    • Broadband pulse generation and precise pulse compression are critical for high-fidelity 2D ES measurements.

    Purpose of the Study:

    • To demonstrate a novel noncollinear coherent two-dimensional electronic spectroscopy setup.
    • To achieve ultrashort (7 fs) broadband pulses for enhanced temporal resolution.
    • To obtain high-quality broadband absorptive 2D electronic spectra for studying quantum phenomena.

    Main Methods:

    • Generation of broadband pulses (500-700 nm) in an argon-filled hollow-core fiber pumped by a Ti:Sapphire laser.
    • Pulse compression to 7 fs duration using dispersive mirrors and TG-FROG (second-harmonic generation FROG).
    • Utilizing a diffractive-optic-based 2D spectrometer design to minimize distortions.
    • Recording and phasing 2D electronic spectra of cresyl-violet perchlorate in ethanol.

    Main Results:

    • Successful generation of 7 fs broadband pulses with clean spatial profiles and smooth spectral shapes.
    • Acquisition of broadband absorptive 2D electronic spectra using the developed technique.
    • Observed quantum beating dynamics consistent with established literature data.
    • Demonstration of the noncollinear geometry's effectiveness in avoiding directional filtering distortions.

    Conclusions:

    • The developed noncollinear coherent 2D electronic spectroscopy enables high-resolution studies of ultrafast molecular dynamics.
    • The technique offers significant improvements in temporal resolution and spectral coverage.
    • This advancement provides a valuable tool for investigating quantum phenomena in condensed-phase systems.