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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Doppler-free Fourier transform spectroscopy.

Samuel A Meek, Arthur Hipke, Guy Guelachvili

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    Summary
    This summary is machine-generated.

    This study introduces sub-Doppler broadband multi-heterodyne spectroscopy. It achieves Doppler-free two-photon dual-comb spectroscopy of atomic rubidium over a 10 THz range.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Spectroscopy
    • Quantum Optics

    Background:

    • Broadband spectroscopy typically involves trade-offs between spectral resolution and bandwidth.
    • Achieving Doppler-free resolution over broad spectral ranges is challenging.
    • Nonlinear spectroscopy requires high spectral resolution for precise measurements.

    Purpose of the Study:

    • To propose and demonstrate a novel sub-Doppler broadband multi-heterodyne spectroscopy technique.
    • To achieve Doppler-free measurements over an unprecedented spectral bandwidth.
    • To enable precision nonlinear spectroscopy applications.

    Main Methods:

    • Utilizing two laser frequency combs with slightly different repetition frequencies.
    • Implementing a dual-comb spectroscopy approach.
    • Recording two-photon absorption spectra of atomic rubidium.
    • Analyzing fluorescence radiation intensity modulation for atomic transition identification.

    Main Results:

    • Experimental demonstration of sub-Doppler broadband multi-heterodyne spectroscopy.
    • Recorded Doppler-free two-photon dual-comb spectra of atomic rubidium with 6 MHz linewidths.
    • Simultaneously interrogated a spectral span of 10 THz.
    • Successfully identified atomic transitions via fluorescence modulation.

    Conclusions:

    • This work represents the first demonstration of Doppler-free Fourier transform spectroscopy.
    • The developed technique significantly extends the capabilities of broadband spectroscopy.
    • The method paves the way for high-precision nonlinear spectroscopy.