Cooling 87 Rb in a magnetic trap

Nathan R. Newbury, Christopher J. Myatt, Eric Cornell +1 more

D. J. Han, R. H. Wynar, Ph. W. Courteille +1 more

E. Paradis, Stefan Zigo, Kong‐Qiu Hu +1 more

We describe cooling and trapping of both ${}^{85}$Rb and ${}^{87}$Rb in a range of magnetic fields up to 2.6 T. Atoms are injected from a low-field pyramidal magneto-optical trap and recaptured in a high-magnetic-field atom trap. The atoms are cooled and trapped by a six-beam optical molasses via the $5{S}_{1/2}|{m}_{I},{m}_{J}=$ 1/2$\ensuremath{\rangle}$$\ensuremath{\rightarrow}$ $5{P}_{3/2}|{m}_{I},{m}_{J}=$ 3/2$\ensuremath{\rangle}$ transition (${m}_{I}=$ 5/2 for ${}^{85}$Rb and ${m}_{I}=$ 3/2 for ${}^{87}$Rb). We study the trap fluorescence spectra, atom temperatures, density distributions, and lifetimes as a function of magnetic field and detuning parameters. The trap fluorescence spectra are both narrow and asymmetric, as is characteristic for laser cooling of atoms in an external trapping potential. The trap is modeled using a Monte Carlo trajectory simulation technique.

Jongsoo Choi, Jeffrey R. Guest, E. Hansis +2 more

D. Ciampini, Marco Anderlini, E. Courtade +5 more

This works reports on using laser cooling and evaporative cooling to create an ultra-cold mixture of /sup 87/Rb and /sup 133/Cs atoms inside the conservative potential of a time-averaged orbiting potential (TOP) magnetic trap. We were able to observe sympathetic cooling of Cs through collisional energy exchange with the Rb atoms, thus reaching Cs temperatures of /spl ap/ 5 /spl mu/K.

WU Haibin

In this paper, a simple setup of laser cooling and trapping of Rb atom is presented. By using the technique of injection locking, we have gained the cooling and trapping laser whose wavelength is 780 nm (single frequency, frequency fluctuation 2 MHz , tunable range～4.5 GHz), and output power is about 60 mW. With applying a magnetic field to the saturated absorption spectrum, the trapping laser frequency which is detuned a desired amount via Zeeman effect is locked. The cooling and trapping of Rb atom is obtained in the MOT.