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Related Experiment Video

Updated: May 14, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

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Precision molecular spectroscopy with a phase-locked terahertz quantum-cascade laser.

R Voigt, M Wienold, D Jayasankar

    Optics Express
    |April 12, 2025
    PubMed
    Summary

    We achieved precise molecular spectroscopy using a phase-locked quantum cascade laser (QCL) at 3.4 THz. This compact, cryogen-free method accurately measured methanol transitions, advancing THz spectroscopy applications.

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    Area of Science:

    • Terahertz (THz) spectroscopy
    • Molecular physics
    • Laser spectroscopy

    Background:

    • Quantum cascade lasers (QCLs) are crucial for THz applications.
    • Precise frequency control of QCLs is essential for high-resolution spectroscopy.
    • Existing THz spectroscopy methods can be complex and require cryogenic cooling.

    Purpose of the Study:

    • To demonstrate precision molecular spectroscopy using a phase-locked QCL.
    • To achieve precise frequency control of a QCL across its tuning range.
    • To measure methanol transitions with high accuracy in a compact, cryogen-free setup.

    Main Methods:

    • Utilized a phase-locked quantum cascade laser (QCL) operating at 3.4 THz.
    • Employed a Schottky diode harmonic mixer to generate an intermediate frequency (IF) signal for phase-locking.

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    Last Updated: May 14, 2025

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    Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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  • Referenced the microwave signal to a rubidium frequency standard for precise frequency control.

    • Main Results:

    • Successfully phase-locked the QCL over its entire frequency tuning range.
    • Identified and precisely quantified ten methanol transitions between 3443.5 and 3447.6 GHz.
    • Achieved high precision in determining transition frequencies and broadening parameters.

    Conclusions:

    • Demonstrated a compact and cryogen-free method for precision THz molecular spectroscopy.
    • The phase-locking technique provides accurate frequency control for QCLs.
    • This advancement has significant implications for molecular spectroscopy and THz applications.