Photonic integrated beam delivery for a rubidium 3D magneto-optical trap

Area of Science:

• Atomic Physics
• Quantum Optics
• Integrated Photonics

Background:

• Cold atoms are crucial for advanced applications like atomic clocks and sensors.
• Magneto-optical traps (MOTs) are essential for producing cold atoms but face limitations in size and reliability.
• Current MOTs require complex free-space optics for laser beam delivery, hindering miniaturization.

Purpose of the Study:

• To demonstrate a novel photonic integrated circuit for laser beam delivery in a 3D magneto-optical trap (3D-MOT).
• To overcome the challenges of integrating laser delivery systems for cold atom experiments.
• To pave the way for miniaturized and robust cold atom systems.

Main Methods:

• Utilized a fiber-coupled silicon nitride photonic integrated circuit.
• Engineered waveguides to transform and deliver 780 nm laser light.
• Generated three millimeter-width, non-diverging free-space beams for cooling and trapping ⁸⁷Rb atoms.

Main Results:

• Successfully demonstrated a 3D magneto-optical trap using the integrated photonic circuit.
• Cooled and trapped over 1 × 10^{6 87}Rb atoms to temperatures near 200 μK.
• Achieved efficient, collimated laser beam delivery directly to the atomic vacuum cell.

Conclusions:

• The developed integrated photonic circuit provides a viable solution for laser beam delivery in 3D-MOTs.
• This approach significantly improves reliability and reduces the size, weight, and cost of cold atom systems.
• The CMOS-compatible design enables system-on-chip solutions, advancing precision atomic applications.