Abstract
Using a well collimated Sr + ion beam with very small energy spread in combination with collinear laser-optical pumping, we have obtained a beam with high electron spin polarization. The Sr + ions were produced with μA intensity by surface ionisation in a point-like hot iridium-plated Ta tube and extraction into a beam guiding system. The 5 2S 1 2 5 2P 1 2 transition was pumped by circularly polarized laser light (421.6 nm) propagating antiparallel to the ion beam. The laser is actively stabilized to the SP transition by means of a newly developed method. The final electron spin polarisation of the ground state for the most abundant 88Sr + isotope was measured to be greater than 90%.
Published Version
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