All-optical production and transport of a large ${}^6$Li quantum gas in a crossed optical dipole trap

Abstract

We report on an efficient production scheme for a large quantum degenerate sample of fermionic lithium. The approach is based on our previous work on narrow-line $2S_{1/2}\to 3P_{3/2}$ laser cooling resulting in a high phase-space density of up to $3\times 10^{-4}$. This allows utilizing a large volume crossed optical dipole trap with a total power of $45\text{W}$, leading to high loading efficiency and $8\times 10^6$ trapped atoms. The same optical trapping configuration is used for rapid adiabatic transport over a distance of $25\text{cm}$ in $0.9\text{s}$, and subsequent evaporative cooling. With optimized evaporation we achieve a degenerate Fermi gas with $1.7\times 10^6$ atoms at a temperature of $60\text{nK}$, corresponding to $T/T_{\text{F}}=0.16\left(2\right)$. Furthermore, the performance is demonstrated by evaporation near a broad Feshbach resonance creating a molecular Bose-Einstein condensate of $3\times 10^5$ lithium dimers.

References in corpus (25)

• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Weakly bound dimers of fermionic atoms
• All Optical Formation of an Atomic Bose-Einstein Condensate
• Three-body problem in Fermi gases with short-range interparticle interaction
• Precise characterization of ^6Li Feshbach resonances using trap-sideband resolved RF spectroscopy of weakly bound molecules
• Transport of Bose-Einstein Condensates with Optical Tweezers
• Microscopic Observation of Pauli Blocking in Degenerate Fermionic Lattice Gases
• Λ-enhanced Sub-Doppler Cooling of Lithium Atoms in D1 Gray Molasses
• Optimal transport of ultracold atoms in the non-adiabatic regime
• All-Optical Production of a Lithium Quantum Gas Using Narrow-Line Laser Cooling
• Ultrastable CO2 Laser Trapping of Lithium Fermions
• Sub-Doppler laser cooling of fermionic 40K atoms in three-dimensional gray optical molasses
• Gray molasses cooling of ${}^{39}$K to a high phase-space density
• Long Distance Transport of Ultracold Atoms using a 1D optical lattice
• Efficient all-optical production of large ${}^6$Li quantum gases using D${}_1$ gray-molasses cooling
• High-resolution imaging of ultracold fermions in microscopically tailored optical potentials
• Low-temperature, high-density magneto-optical trapping of potassium using the open 4S-5P transition at 405 nm
• Resonator-Enhanced Optical Dipole Trap for Fermionic Lithium Atoms
• Magic wavelengths for optical cooling and trapping of lithium
• Thermal equilibrium and efficient evaporation of an ultracold atom-molecule mixture
• Optical transport and manipulation of an ultracold atomic cloud using focus-tunable lenses
• All optical cooling of ${}^{39}$K to Bose Einstein condensation
• Two-stage magneto-optical trapping and narrow-line cooling of ${}^6$Li atoms to high phase-space density
• Long range transport of ultra cold atoms in a far-detuned 1D optical lattice
• Realization of BEC-BCS crossover physics in a compact oven-loaded magneto-optic trap apparatus

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• A quantum degenerate Bose-Fermi mixture of ${}^{41}$K and ${}^6$Li
• Site-Resolved Imaging of Bosonic Mott Insulator of ${}^7$Li atoms
• Fast optical transport of ultracold molecules over long distances
• Comparison of an efficient implementation of gray molasses to narrow-line cooling for the all-optical production of a lithium quantum gas
• Long distance optical conveyor-belt transport of ultracold ${}^{133}$Cs and ${}^{87}$Rb atoms
• Simulating sympathetic cooling of atomic mixtures in nonlinear traps
• Absolute frequency measurement of molecular iodine hyperfine transitions at 647 nm
• Preparation of quasi-two-dimensional Bose mixture of ultracold ${}^{23}$Na and ${}^{87}$Rb atoms