Rearrangement of single atoms in a 2000-site optical tweezers array at cryogenic temperatures

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We report on the trapping of single rubidium atoms in large arrays of optical tweezers comprising up to 2088 sites in a cryogenic environment at 6 K.

• Our approach relies on the use of microscope objectives that are in-vacuum but at room temperature, in combination with windowless thermal shields into which the objectives are protruding to ensure a cryogenic environment for the trapped atoms.
• To achieve enough optical power for efficient trapping, we combine two lasers at slightly different wavelengths.
• We discuss the performance and limitations of our design.