![]() ![]() Today’s atom trapping and cooling systems employ free-space lasers and optics that occupy tables and racks and are costly and power consuming. ![]() This planar, CMOS foundry-compatible integrated beam delivery is compatible with other components, such as lasers and modulators, promising system-on-chip solutions for cold atom applications.Ĭold atoms 1, 2, 3, 4 are a central component of precision scientific tools, including atomic clocks 5, 6, 7, 8 and ultra-high resolution spectroscopy 9, 10, 11 and are an important technology for applications such as atomic timekeeping 12, quantum computing 13, 14, 15, 16, 17, 18, and quantum sensing 19, 20, 21 by enabling improved spectroscopy resolution for observing the quantum behavior of atoms 3. The silicon nitride photonic circuit transforms fiber-coupled 780 nm cooling and repump light via waveguides to three mm-width non-diverging free-space cooling and repump beams directly to the rubidium cell. Here we report the demonstration of a 87Rb 3D-MOT using a fiber-coupled photonic integrated circuit to deliver all beams to cool and trap > 1 ×10 6 atoms to near 200 μK. Yet, to date, beam delivery using an integrated waveguide approach has remained elusive. These traps require the delivery of multiple, large area, collimated laser beams to an atomic vacuum cell. The 3D magneto-optical trap (3D-MOT), used to produce cold atoms, will benefit from photonic integration to improve reliability and reduce size, weight, and cost. Cold atoms are important for precision atomic applications including timekeeping and sensing.
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