Trapping Single Ions and Coulomb Crystals with Light Fields by Leon Karpa

Author:Leon Karpa
Language: eng
Format: epub, pdf
ISBN: 9783030277161
Publisher: Springer International Publishing

3. Optical Dipole Traps for Single Ions

Leon Karpa1

(1)Institute of Physics, University of Freiburg, Freiburg im Breisgau, Baden-Württemberg, Germany

Keywords

Optical dipole trapsIonsLifetimesHeating ratesOff-resonant scatteringFar-off-resonance dipole traps

The first demonstration of optical trapping of an ion was achieved in 2010, where a near resonant focused dipole trap was used to confine a Mg+ ion for a few milliseconds [1]. As discussed in the previous chapters, already at this early stage fairly precise compensation of stray electric fields was essential. In order to obtain trap depths of several (10 mK)k B, sufficient for optical trapping of ions laser cooled to about 5 T D, a focused beam with a detuning of about Δ ≈ 6.6 × 103  Γ was used, where Γ is the natural line width of the addressed optical transition and the Doppler cooling limit is denoted with T D ≈ 1 mK. It was found that the heating caused by off-resonant scattering from the dipole trap experienced by the ion within trapping durations of a few ms was on the order of the trap depth and thus the main mechanism limiting the observed ion lifetime as shown in Fig. 3.1.

Fig. 3.1Optical trapping probability of a 24Mg+ ion in a near-resonant optical dipole trap as a function of the trapping duration. Taken from [1]

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