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    We developed versatile, high-numerical-aperture objectives for cold-atom experiments using commercial lenses. These objectives offer flexible reoptimization for various wavelengths and window thicknesses, aiding individual atom observation.

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    Area of Science:

    • Atomic, Molecular & Optical Physics
    • Optical Engineering
    • Experimental Physics

    Background:

    • Cold-atom experiments require high-resolution imaging objectives.
    • Existing objectives may lack versatility for diverse experimental conditions.
    • Customized optics can be costly and time-consuming to develop.

    Purpose of the Study:

    • To present two novel, versatile high-numerical-aperture objectives for cold-atom research.
    • To demonstrate their adaptability to various experimental parameters.
    • To provide accessible, high-performance imaging solutions for atomic physics.

    Main Methods:

    • Objectives designed and simulated using ray-tracing software.
    • Assembled using commercially available singlet lenses.
    • Performance validated through imaging line patterns and point-like emitters.

    Main Results:

    • Two objectives with NA=0.55 and NA=0.78 achieved.
    • Demonstrated working distances of 23 mm and 12.8 mm.
    • Achieved spatial resolutions of 0.94 μm and 0.67 μm, confirmed experimentally.

    Conclusions:

    • The objectives are suitable for observing individual atoms in cold-atom experiments.
    • Their design allows easy reoptimization for different wavelengths and window thicknesses.
    • These optics offer a convenient and flexible solution for atomic physics research.