Characteristics of a magneto-optical trap of molecules

Abstract

We present the properties of a magneto-optical trap (MOT) of CaF molecules. We study the process of loading the MOT from a decelerated buffer-gas-cooled beam, and how best to slow this molecular beam in order to capture the most molecules. We determine how the number of molecules, the photon scattering rate, the oscillation frequency, damping constant, temperature, cloud size and lifetime depend on the key parameters of the MOT, especially the intensity and detuning of the main cooling laser. We compare our results to analytical and numerical models, to the properties of standard atomic MOTs, and to MOTs of SrF molecules. We load up to $2\times 10^4$ molecules, and measure a maximum scattering rate of $2.5\times 10^6$ s${}^{-1}$ per molecule, a maximum oscillation frequency of 100 Hz, a maximum damping constant of 500 s${}^{-1}$, and a minimum MOT rms radius of 1.5 mm. A minimum temperature of 730 $\mu$K is obtained by ramping down the laser intensity to low values. The lifetime, typically about 100 ms, is consistent with a leak out of the cooling cycle with a branching ratio of about $6\times 10^{-6}$. The MOT has a capture velocity of about 11 m/s.

arXiv comment27 pages, 16 figures

References in corpus (30)

• Cold and Ultracold Molecules: Science, Technology, and Applications
• A toolbox for lattice spin models with polar molecules
• An atom-by-atom assembler of defect-free arbitrary 2d atomic arrays
• Laser cooling of a diatomic molecule
• Magneto-optical trapping of a diatomic molecule
• Molecules cooled below the Doppler limit
• Magneto-optical trapping of diatomic molecules
• Laser cooling and slowing of CaF molecules
• Sisyphus Laser Cooling of a Polyatomic Molecule
• Radio Frequency Magneto-Optical Trapping of CaF with High Density
• Magneto-Optical Trap for Polar Molecules
• Sub-millikelvin dipolar molecules in a radio-frequency magneto-optical trap
• Laser radiation pressure slowing of a molecular beam
• Design for a fountain of YbF molecules to measure the electron's electric dipole moment
• A Bright, Slow Cryogenic Molecular Beam Source for Free Radicals
• Magneto-optical trapping forces for atoms and molecules with complex level structures
• An intense, cold, velocity-controlled molecular beam by frequency-chirped laser slowing
• On the Prospects for Laser Cooling of TlF
• Three-dimensional Doppler, polarization-gradient, and magneto-optical forces for atoms and molecules with dark states
• Improved magneto-optical trapping of a diatomic molecule
• Modeling magneto-optical trapping of CaF molecules
• Lifetime of the A(v'=0) state and Franck-Condon factor of the A-X(0-0) transition of CaF measured by the saturation of laser-induced fluorescence
• Modeling sympathetic cooling of molecules by ultracold atoms
• Hyperfine Structure of the $B^3{\Pi }_1$ State and Predictions of Optical Cycling Behavior in the $X\to B$ transition of TlF
• Zeeman-tuned rotational level-crossing spectroscopy in a diatomic free radical
• An extra-heating mechanism in Doppler-cooling experiments
• Principles and design of a Zeeman-Sisyphus decelerator for molecular beams
• Radiative Branching Ratios for Excited States of ${}^{174}$YbF: Application to Laser Cooling
• Production and characterization of a dual species magneto-optical trap of cesium and ytterbium
• Three-dimensional laser cooling at the Doppler limit

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