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Production of Rubidium Bose-Einstein Condensate in an Optically Plugged Magnetic Quadrupole Trap

Dongfang, Zhang, Tianyou +7 more

Chinese Physics LettersJan 1, 20160 citations

High-Performance Sodium Bose–Einstein Condensate Apparatus with a Hybrid Trap and Long-Distance Magnetic Transfer

Feng Zhang, Yun Long, Jiang-Ling Yang +3 more

We report on the production of large sodium Bose–Einstein condensates in a hybrid of magnetic quadrupole and optical dipole trap. With an optimized spin-flip Zeeman slower, 2 × 10 10 sodium atoms are captured in the magneto-optical trap (MOT). A long distance magnetic transfer setup moves the cold atom over 46 cm from the MOT chamber to the UHV science chamber, which provides great optical access and long conservative trap lifetime. After evaporative cooling in the hybrid trap, we produce nearly pure condensates of 1 × 10 7 atoms with lifetime of 80 s in the optical dipole trap.We report on the production of large sodium Bose–Einstein condensates in a hybrid of magnetic quadrupole and optical dipole trap. With an optimized spin-flip Zeeman slower, 2 × 10 10 sodium atoms are captured in the magneto-optical trap (MOT). A long distance magnetic transfer setup moves the cold atom over 46 cm from the MOT chamber to the UHV science chamber, which provides great optical access and long conservative trap lifetime. After evaporative cooling in the hybrid trap, we produce nearly pure condensates of 1 × 10 7 atoms with lifetime of 80 s in the optical dipole trap.

Chinese Physics LettersDec 1, 20154 citations

Efficient production of sodium Bose–Einstein condensates in a hybrid trap

Y. Geng, Shouvik Mukherjee, S. Banik +6 more

We describe an apparatus that efficiently produces 23Na Bose-Einstein condensates (BECs) in a hybrid trap that combines a quadrupole magnetic field with a far-detuned optical dipole trap. Using a Bayesian optimization framework, we systematically optimize all BEC production parameters in modest-sized batches of highly correlated parameters. Furthermore, we introduce a Lagrange multiplier-based technique to optimize the duration of different evaporation stages constrained to have a fixed total duration; this enables the progressive creation of increasingly rapid experimental sequences that still generate high-quality BECs. Taken together, our techniques constitute a general approach for refining and accelerating sequence-based experimental protocols.We describe an apparatus that efficiently produces 23Na Bose-Einstein condensates (BECs) in a hybrid trap that combines a quadrupole magnetic field with a far-detuned optical dipole trap. Using a Bayesian optimization framework, we systematically optimize all BEC production parameters in modest-sized batches of highly correlated parameters. Furthermore, we introduce a Lagrange multiplier-based technique to optimize the duration of different evaporation stages constrained to have a fixed total duration; this enables the progressive creation of increasingly rapid experimental sequences that still generate high-quality BECs. Taken together, our techniques constitute a general approach for refining and accelerating sequence-based experimental protocols.

arXiv:2505.21415Review of Scientific InstrumentsSep 1, 20250 citations

On the way to Bose-Einstein Condensates in Optical and Electro-Magnetic Traps

Q. Long, Shuyu Zhou, L. F. Xu +2 more

Springer eBooksJan 1, 20000 citations

Bose-Einstein Condensates in Magnetic Micro Traps

Claus Zimmermann, József Fortágh, Herwig Ott +2 more

International Conference on Atomic Physics (ICAP)Apr 1, 20031 citation

Optically plugged quadrupole trap for Bose-Einstein condensates

D. Naik, Chandra Raman

We created sodium Bose-Einstein condensates in an optically plugged quadrupole magnetic trap. A focused, 532-nm laser beam repelled atoms from the coil center where Majorana loss is significant. We produced condensates containing up to $3\ifmmode\times\else\texttimes\fi{}{10}^{7}$ atoms, a factor of 60 improvement over previous work and a number comparable to the best all-magnetic traps, and transferred up to $9\ifmmode\times\else\texttimes\fi{}{10}^{6}$ atoms into a purely optical trap. We compare our observations with a simple model of evaporative cooling, concluding that a laser in the range of 1 W (rather than 5 W) may suffice.We created sodium Bose-Einstein condensates in an optically plugged quadrupole magnetic trap. A focused, 532-nm laser beam repelled atoms from the coil center where Majorana loss is significant. We produced condensates containing up to $3\ifmmode\times\else\texttimes\fi{}{10}^{7}$ atoms, a factor of 60 improvement over previous work and a number comparable to the best all-magnetic traps, and transferred up to $9\ifmmode\times\else\texttimes\fi{}{10}^{6}$ atoms into a purely optical trap. We compare our observations with a simple model of evaporative cooling, concluding that a laser in the range of 1 W (rather than 5 W) may suffice.

arXiv:cond-mat/0406341Physical Review AMar 14, 200542 citations

Generating sodium Bose-Einstein condensates in hybrid magnetic quadrupole and optical traps

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Generating sodium Bose-Einstein condensates in hybrid magnetic quadrupole and optical traps

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