K. Sugiyama et J. Yoda, LASER COOLING OF A NATURAL ISOTOPE MIXTURE OF YB+ STORED IN AN RF TRAP, IEEE transactions on instrumentation and measurement, 44(2), 1995, pp. 140-143
We demonstrate laser cooling of Yb+, produced by ionization of a natur
al isotope mixture, stored in an rf trap. One of the three major even
isotopes was directly laser cooled and other isotopes were simultaneou
sly trapped as a result of sympathetic cooling. It was possible to car
ry out laser cooling to the temperature at which the cloud-to-crystal
phase transition occurs for Yb-174(+), as observed in the case where e
nriched isotopes are used. We observed sudden drops of fluorescence ow
ing to pumping to the F-2(7/2) state in the case of a small number of
trapped Yb+ ions.