Sympathetic cooling of 85 Rb and 87 Rb
نویسندگان
چکیده
We demonstrate sympathetic cooling between magnetically trapped 85Rb and 87Rb atoms. Up to 6!106 85Rb atoms are cooled via elastic collisions with a reservoir of 8!108 87Rb atoms. The temperature of the binary atomic ensemble is adjusted by using radio-frequency evaporation of 87Rb. Temperatures as low as T "100 nK have been realized in the binary ensemble. Through a cross-dimensional mixing approach we have been able to measure the interspecies 87Rb-85Rb scattering cross section #"1.52(34)!10#15 m2.
منابع مشابه
Ultracold Rb-OH collisions and prospects for sympathetic cooling.
We compute ab initio cross sections for cold collisions of Rb atoms with OH radicals. We predict collision rate constants of order 10(-11) cm3/s at temperatures in the range 10-100 mK at which molecules have already been produced. However, we also find that in these collisions the molecules have a strong propensity for changing their internal state, which could make sympathetic cooling of OH in...
متن کاملGeneration of pulsed and continuous-wave squeezed light with 87Rb vapor.
We present experimental studies on the generation of pulsed and continuous-wave squeezed vacuum via nonlinear rotation of the polarization ellipse in a (87)Rb vapor. Squeezing is observed for a wide range of input powers and pump detunings on the D1 line, while only excess noise is present on the D2 line. The maximum continuous-wave squeezing observed is -1.4 +/- 0.1 dB (-2.0 dB corrected for l...
متن کاملMagnetic transport apparatus for the production of ultracold atomic gases in the vicinity of a dielectric surface.
We present an apparatus designed for studies of atom-surface interactions using quantum degenerate gases of (85)Rb and (87)Rb in the vicinity of a room temperature dielectric surface. The surface to be investigated is a super-polished face of a glass Dove prism mounted in a glass cell under ultra-high vacuum. To maintain excellent optical access to the region surrounding the surface, magnetic t...
متن کاملFermi-Bose and Bose-Bose K-Rb Quantum Degenerate Mixtures
We describe the properties of mixtures composed by potassium and rubidium atoms, simultaneously trapped in a magnetic potential. Potassium isotopes are cooled down to quantum degeneracy by means of sympathetic cooling with rubidium [1]. We can produce both a two-species Bose-Einstein condensate [2] mixing together Rb and K, and a degenerate system composed by a Fermi gas of K atoms and a Bose-E...
متن کاملCollisions of doubly spin-polarized, ultracold 85Rb atoms.
We study the collisions of doubly-spin polarized 85 Rb atoms at milliKelvin temperatures using photoassociation spectroscopy. Because the atoms are spin-polarized, only triplet collisional states are formed. This leads to pho-toassociation spectra of a particularly simple form, which exhibit clear quantum statistical features. These spectra are analyzed to yield the ground state triplet scatter...
متن کامل