Two-temperature momentum distribution in a Thulium magneto-optical trap
arXiv:1707.02947 · doi:10.1103/PhysRevA.96.033418
Abstract
Second-stage laser cooling of thulium atoms at the 530.7 nm transition with a natural linewidth of 350 kHz offers an interesting possibility to study different regimes of a magneto-optical trap (MOT). The intermediate value of the spectral linewidth of the cooling transition allows the observation of three distinct regimes depending on intensity and detuning of the cooling beams. Namely, the "bowl-shaped" regime when light pressure force competes with gravity, the "double structure" regime with interplay between Doppler and polarization-gradient (sub-Doppler) cooling, and the "symmetric" regime when Doppler cooling dominates over sub-Doppler cooling and gravity. The polarization-gradient cooling manifests itself by a two-temperature momentum distribution of atoms resulting in a double-structure of the spatial MOT profile consisting of a cold central fraction surrounded by a hot halo. We studied the "double structure" regime at different saturation parameters and compared observations with calculations based on semiclassical and quantum approaches. The quantum treatment adequately reproduces experimental results if the MOT magnetic field is properly taken into account.
arXiv comment7 pages, 6 figures
References in corpus (20)
- A Strongly Dipolar Bose-Einstein Condensate of Dysprosium
- d-wave collapse and explosion of a dipolar Bose-Einstein condensate
- Extended Bose-Hubbard Models with Ultracold Magnetic Atoms
- Emergence of chaotic scattering in ultracold Er and Dy
- Narrow-line magneto-optical trap for erbium
- Narrow Line Cooling and Momentum-Space Crystals
- Magneto-Optical Trap for Thulium Atoms
- Observation of Fermi surface deformation in a dipolar quantum gas
- Dysprosium magneto-optical traps
- Magneto-Optical Trapping of Holmium Atoms
- Narrow Line Cooling: Finite Photon Recoil Dynamics
- Narrow-line magneto-optical cooling and trapping of strongly magnetic atoms
- Inner-shell magnetic dipole transition in Tm atom as a candidate for optical lattice clocks
- Optical cooling and trapping of highly magnetic atoms: The benefits of a spontaneous spin polarization
- Sub-Doppler laser cooling and magnetic trapping of erbium
- Differential Scattering and Rethermalization in Ultracold Dipolar Gases
- On the prospects of building optical atomic clocks using Er I or Er III
- Magnetic Trapping of Metastable Calcium Atoms
- Sub-Doppler Laser Cooling of Thulium Atoms in a Magneto-optical Trap
- Anisotropic sub-Doppler laser cooling in dysprosium magneto-optical traps
Cited by in corpus (6)
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- Inspiration from machine learning on example of optimization of the Bose-Einstein condensate of thulium atoms in a 1064-nm trap
- Sub-Doppler cooling of bosonic strontium in a two-color MOT
- Transport of magnetically sensitive atoms in a magnetic environment