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

Bose–Einstein Condensation in a Trap

Chen Ning Yang

International Journal of Modern Physics BMar 10, 19972 citations

BOSE-EINSTEIN CONDENSATION IN A TRAP

Chen Ning Yang

WORLD SCIENTIFIC eBooksJan 1, 20260 citations

Fast production of large Na23 Bose-Einstein condensates in an optically plugged magnetic quadrupole trap

Myoung-Sun Heo, Jae-yoon Choi, Yong-il Shin

We demonstrate a fast production of large $^{23}\mathrm{Na}$ Bose-Einstein condensates in an optically plugged magnetic quadrupole trap. A single global minimum of the trapping potential is generated by slightly displacing the plug beam from the center of the quadrupole field. With a dark magneto-optical trap and a simple rf evaporation, our system produces a condensate with $N\ensuremath{\approx}{10}^{7}$ atoms every 17 s. The Majorana loss rates and the resultant heating rates for various temperatures are measured with and without plugging. The average energy of a spin-flipped atom is almost linearly proportional to temperature and determined to be about $60%$ of the average energy of a trapped atom. We present a numerical study of the evaporation dynamics in a plugged linear trap.We demonstrate a fast production of large $^{23}\mathrm{Na}$ Bose-Einstein condensates in an optically plugged magnetic quadrupole trap. A single global minimum of the trapping potential is generated by slightly displacing the plug beam from the center of the quadrupole field. With a dark magneto-optical trap and a simple rf evaporation, our system produces a condensate with $N\ensuremath{\approx}{10}^{7}$ atoms every 17 s. The Majorana loss rates and the resultant heating rates for various temperatures are measured with and without plugging. The average energy of a spin-flipped atom is almost linearly proportional to temperature and determined to be about $60%$ of the average energy of a trapped atom. We present a numerical study of the evaporation dynamics in a plugged linear trap.

arXiv:1011.1078Physical Review AJan 26, 201133 citations

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

Dongfang Zhang, Tianyou Gao, Lingran Kong +2 more

We experimentally produce the rubidium Bose—Einstein condensate in an optically plugged magnetic quadrupole trap. A far blue-detuned focused laser beam with a wavelength of 532 nm is plugged in the center of the magnetic quadrupole trap to increase the number of trapped atoms and to suppress the heating. An rf evaporative cooling in the magneto-optical hybrid trap is applied to decrease the atom temperature into degeneracy. The atom number of the condensate is 1.2(0.4) × 10 5 and the temperature is below 100 nK. We also study characteristic behaviors of the condensate, such as phase space density, condensate fraction and anisotropic expansion.We experimentally produce the rubidium Bose—Einstein condensate in an optically plugged magnetic quadrupole trap. A far blue-detuned focused laser beam with a wavelength of 532 nm is plugged in the center of the magnetic quadrupole trap to increase the number of trapped atoms and to suppress the heating. An rf evaporative cooling in the magneto-optical hybrid trap is applied to decrease the atom temperature into degeneracy. The atom number of the condensate is 1.2(0.4) × 10 5 and the temperature is below 100 nK. We also study characteristic behaviors of the condensate, such as phase space density, condensate fraction and anisotropic expansion.

arXiv:1605.07695Chinese Physics LettersJul 1, 20161 citation

Experiments with Bose-Einstein condensation in an optical box

Todd P. Meyrath

Jan 1, 20056 citations

We demonstrate a fast production of large

^{23}\mathrm{Na}

Bose-Einstein condensates in an optically plugged magnetic quadrupole trap. A single global minimum of the trapping potential is generated by slightly displacing the plug beam from the center of the quadrupole field. With a dark magneto-optical trap and a simple rf evaporation, our system produces a condensate with $N\ensuremath{\approx}{10}^{7}$ atoms every 17 s. The Majorana loss rates and the resultant heating rates for various temperatures are measured with and without plugging. The average energy of a spin-flipped atom is almost linearly proportional to temperature and determined to be about

60%

of the average energy of a trapped atom. We present a numerical study of the evaporation dynamics in a plugged linear trap.