Multiply loaded magneto-optical trap.

We report a two-chambered, differentially pumped system that permits rapid collection of trapped atoms with a vapor cell magneto-optical trap (MOT) and efficient transfer of these atoms to a second MOT in a lowerpressure chamber. During the transfer the atoms are guided down a long, thin tube by a magnetic potential, with 90(15%) transfer efficiency. By multiply loading, we accumulate and hold as many as 30 times the number collected by the vapor cell MOT. By thus separating the collection and holding functions of a MOT, we can collect as many as 1.5(0.6) x 10(10) rubidium atoms and hold them for longer than 100 s, using inexpensive low-power diode lasers.

[1]  C. Wieman,et al.  Measurement of Cs-Cs elastic scattering at T=30 μK , 1993 .

[2]  Robinson,et al.  Very cold trapped atoms in a vapor cell. , 1990, Physical review letters.

[3]  Cornell,et al.  Multiply loaded, ac magnetic trap for neutral atoms. , 1991, Physical Review Letters.

[4]  Cornell,et al.  Reduction of light-assisted collisional loss rate from a low-pressure vapor-cell trap. , 1994, Physical review. A, Atomic, molecular, and optical physics.

[5]  Cooper,et al.  Phase-space density in the magneto-optical trap. , 1995, Physical review. A, Atomic, molecular, and optical physics.

[6]  Stephens,et al.  Experimental and theoretical study of the vapor-cell Zeeman optical trap. , 1992, Physical review. A, Atomic, molecular, and optical physics.

[7]  C. Wieman,et al.  A narrow‐band tunable diode laser system with grating feedback, and a saturated absorption spectrometer for Cs and Rb , 1992 .

[8]  C. Wieman,et al.  Observation of Bose-Einstein Condensation in a Dilute Atomic Vapor , 1995, Science.

[9]  Gibble,et al.  Direct observation of s-wave atomic collisions. , 1995, Physical review letters.

[10]  Brian Fujikawa,et al.  Laser trapping of short-lived radioactive isotopes. , 1994 .