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Phase-synchronous undersampling in nonlinear spectroscopy.

Lukas Bruder, Marcel Binz, Frank Stienkemeier

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    Phase-synchronous undersampling enhances signal quality and reduces acquisition time in nonlinear spectroscopy. This technique is ideal for experiments with limited signal or detection rates, improving efficiency.

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    Area of Science:

    • Nonlinear spectroscopy
    • Quantum optics
    • Spectroscopic techniques

    Background:

    • Nonlinear spectroscopy enables probing molecular and material properties.
    • High-frequency modulations in spectroscopy often require high sampling rates, limiting experimental setups.
    • Quantum beat experiments provide a sensitive platform for spectroscopic studies.

    Purpose of the Study:

    • Introduce and validate phase-synchronous undersampling for nonlinear spectroscopy.
    • Demonstrate the benefits of undersampling for signal quality and acquisition time.
    • Identify the operational limits and breakdown conditions of the undersampling method.

    Main Methods:

    • Developed theoretical framework for phase-synchronous undersampling.
    • Experimentally validated the theory using a phase-modulated quantum beat experiment.
    • Employed low laser repetition rates to sample high phase modulation frequencies.

    Main Results:

    • Phase-synchronous undersampling significantly improves signal quality.
    • Acquisition times are substantially reduced compared to traditional methods.
    • Breakdown conditions for the undersampling technique were successfully identified.

    Conclusions:

    • Phase-synchronous undersampling is a powerful technique for nonlinear spectroscopy.
    • The method offers practical advantages for experiments with limited signal or detection capabilities.
    • This approach enhances the efficiency and accessibility of advanced spectroscopic measurements.