Ultrastable CO2 Laser Trapping of Lithium Fermions
  We demonstrate an ultrastable CO2 laser trap that provides tight confinement of neutral atoms with negligible optical scattering and minimal laser-noise- induced heating. Using this method, fermionic 6Li atoms are stored in a 0.4 mK deep well with a 1/e trap lifetime of 300 sec, consistent with a background pressure of 10^(-11) Torr. To our knowledge, this is the longest storage time ever achieved with an all-optical trap, comparable to the best reported magnetic traps. 
K. M. O'Hara, S. R. Granade, M. E. Gehm, T. A. Savard, S. Bali, C.   Freed, and J. E. Thomas