3 years ago

Efficient and robust photo-ionization loading of beryllium ions

Klaus Wendt, Sebastian Wolf, Dominik Studer, Ferdinand Schmidt-Kaler


We demonstrate the efficient generation of \(\hbox {Be}^+\) ions with a 60 ns and 150 nJ laser pulse near 235 nm for two-step photo-ionization, proven by subsequent counting of the number of ions loaded into a linear Paul trap. The bandwidth and power of the laser pulse are chosen in such a way that a first, resonant step fully saturates the entire velocity distribution of beryllium atoms effusing from a thermal oven. The second excitation step is driven by the same light field causing efficient non-resonant ionization. Our ion-loading scheme has a similar efficiency as compared to former pathways using two-photon continuous wave laser excitation, but with an order of magnitude lower than average UV light power.

Publisher URL: https://link.springer.com/article/10.1007/s00340-018-6903-3

DOI: 10.1007/s00340-018-6903-3

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