Compact Continuous Cold Atomic Beam from a Single Cell with 3D Cooling and Ultra-low Light Shift

Abstract

We report a compact single-cell source of a continuous cold-atom beam with three-dimensional (3D) cooling. By integrating an off-axis moving optical molasses (OM) with a two-dimensional magneto-optical trap (MOT), we achieve simultaneous 3D cooling within a 50 mm interaction region. The source delivers a continuous flux up to 4.9(5)x10^9 atoms/s, with a transverse temperature of 94(5) microK, a longitudinal temperature as low as 231(65) microK, and a tunable mean velocity between 5 and 20 m/s. Custom in-vacuum mirrors integrate the reflective geometry for the off-axis OM beams with a 0.8 mm output aperture, ensuring stable alignment while suppressing stray light and fluorescence leakage. Ultra-low light shift and decoherence are verified via continuous Raman-Ramsey interferometry, yielding a light shift of -0.51(4)Hz and a typical fringe contrast of 90.85(30)% at a Raman separation of 100 mm (interrogation time of 8.70 ms). This compact continuous cold-atom beam source constitutes a practical building block for atomic-beam clocks and interferometers, enabling reduced aliasing noise together with improved sensitivity and accuracy for field applications.

9 pages, 11 figures

References in corpus (18)

• Logical quantum processor based on reconfigurable atom arrays
• Continuous Cold-atom Inertial Sensor with $1{\text{nrad.s}}^{-1}$ Rotation Stability
• Gravity surveys using a mobile atom interferometer
• Interleaved Atom Interferometry for High Sensitivity Inertial Measurements
• Power stabilization of a diode laser with an acousto-optic modulator
• A high-flux BEC source for mobile atom interferometers
• Continuous Bose-Einstein condensation
• Intense slow beams of bosonic potassium isotopes
• Continuous operation of a coherent 3,000-qubit system
• A continuous, sub-Doppler-cooled atomic beam interferometer for inertial sensing
• A Cold Atomic Beam Interferometer
• Advanced light-shift compensation protocol in a continuous-wave microcell atomic clock
• Photon scattering errors during stimulated Raman transitions in trapped-ion qubits
• Closed-Loop Dual-Atom-Interferometer Inertial Sensor with Continuous Cold Atomic Beams
• A compact high-flux cold atom beam source
• Closed-loop measurements in an atom interferometer gyroscope with velocity-dependent phase-dispersion compensation
• Single-Beam Magneto-Optical Trap in Back-to-Back Pyramidal and Conical Mirrors
• Equilibrium trapping of cold atoms using dipole and radiative forces in an optical trap