Background-Free Doppler Cooling of Trapped Ions Using Quadrupole Transition
2013
We demonstrate experimentally the Doppler cooling of Ca-40(+) ions using the S-1/2 -> D-3/2 electric quadrupole transition, in which the scattering light that is much different from the exciting light makes it possible to collect background-free fluorescence. The idea excluding 397 nm excitation has the advantage of high-sensitivity detection and only employs lasers in red and infrared wavelengths, which should be practical for trapped-ion quantum information processing.
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