Efficient repumping of a Ca magneto-optical trap
Hudson, Eric R.
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We investigate the limiting factors in the standard implementation of the Ca magneto-optical trap. We find that intercombination transitions from the 4s5p(1)P(1) state used to repump the electronic population from the 3d4s D-1(2) state severely reduce the trap lifetime. We explore seven alternative repumping schemes theoretically and investigate five of them experimentally. We find that all five of these schemes yield a significant increase in the trap lifetime and consequently improve the number of atoms and peak atom density by as much as similar to 20 times and similar to 6 times, respectively. One of these transitions, at 453 nm, is shown to approach the fundamental limit for a Ca magneto-optical trap with repumping only from the dark 3d4s 1D2 state, yielding a trap lifetime of similar to 5 s.