Laser cooling of a Ca+ ion cloud in a Paul trap

Peter Fisk, M.A. Lawn, C. Coles

P. Delahaye

Martina Knoop, J. Rink, M. Vedel +1 more

Th. Gudjons, F. Arbes, M. Benzing +2 more

Experiments on Ca* ions, confined in a Paul trap, deal with the spatial distribution of the fluorescence intensity, from which information on the velocity distribution of an ion cloud can be derived.We obtained laser cooling of a large (about lo4) ion cloud.For a few or single trapped ions crystallization, "dark resonances" and quantum jumps have been observed.

Bin Guo, Guan Hua, Liu Qu +3 more

40 Ca + ions are trapped and laser cooled in a miniature Paul trap. The secular motion was observed by the radio-frequency resonance of the ion cloud and Zeeman profile sidebands of a single ion experimentally. The trap stability parameters a and q are determined with an uncertainty under 1 % by the secular motion frequency measurement. The trap efficiency is 0.75. A practicable suggestion is given for the benefits of a new trap design.

Ferdinand Schmidt‐Kaler, Jürgen Eschner, R. Blatt +3 more