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Related Experiment Video

Updated: Dec 28, 2025

Construction of a High Resolution Microscope with Conventional and Holographic Optical Trapping Capabilities
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Imaging trapped quantum gases by off-axis holography.

J Smits, A P Mosk, P van der Straten

    Optics Letters
    |February 15, 2020
    PubMed
    Summary

    We developed a holographic imaging technique to study trapped quantum gases. This method achieves high sensitivity, enabling phase delay measurements with significantly lower light exposure than traditional methods.

    Area of Science:

    • Atomic, Molecular, and Optical (AMO) Physics
    • Quantum Optics
    • Condensed Matter Physics

    Background:

    • Trapped quantum gases are crucial for studying quantum phenomena.
    • Accurate imaging is essential for characterizing these systems.
    • Existing phase-contrast imaging methods require high probe light doses, potentially disturbing the quantum gas.

    Purpose of the Study:

    • To introduce a novel dispersive imaging method for trapped quantum gases.
    • To enhance sensitivity in phase delay measurements.
    • To reduce the required probe beam intensity for imaging.

    Main Methods:

    • Digital off-axis holography was employed for imaging.
    • Both phase delay and intensity were extracted from a single holographic image.

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  • Numerical correction for image defocusing was performed using the full probe beam field.

    • Main Results:

    • The holographic method provides inherent heterodyne gain.
    • Phase delay induced by atoms was retrieved at probe beam doses two orders of magnitude lower than conventional phase-contrast methods.
    • Defocusing artifacts were successfully corrected numerically.

    Conclusions:

    • Digital off-axis holography offers a highly sensitive and low-light imaging solution for trapped quantum gases.
    • This technique minimizes light-induced perturbations, preserving the delicate quantum states.
    • The method advances the characterization capabilities for quantum gas systems.