Abstract
We present experiments on polarization gradient cooling of Ca+ multi-ion Coulomb crystals in a linear Paul trap. Polarization gradient cooling of the collective modes of motion whose eigenvectors have overlap with the symmetry axis of the trap is achieved by two counter-propagating laser beams with mutually orthogonal linear polarizations that are blue-detuned from the S1/2 ↔ P1/2 transition. We demonstrate cooling of linear chains of up to 51 ions and 2D-crystals in zig-zag configuration with 22 ions. The cooling results are compared with numerical simulations and the predictions of a simple model of cooling in a moving polarization gradient.
Highlights
Laser cooling is an important technique to prepare neutral atoms and trapped ions at low temperature [1,2,3]
We investigate polarization gradient cooling using the following experimental sequence: in the first step, calcium ions are prepared in the S1/2 state and Doppler cooling is performed for 3 ms
We have investigated polarization gradient cooling of long ion strings and planar crystals in a linear Paul trap
Summary
M K Joshi1,2 , A Fabre, C Maier, T Brydges1,2 , D Kiesenhofer, H Hainzer, R Blatt and C F Roos1,2,∗. ∗ Author to whom any correspondence should be addressed
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