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Two-color photoionization of calcium using SHG and LED light

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Abstract

We present a photoionization method to load single 40Ca ions in a linear Paul trap from an atomic beam. Neutral Ca I atoms are resonantly excited from the ground state to the intermediate 4s4p 1P1-level using coherent 423 nm radiation produced by single-pass second harmonic generation in a periodically poled KTiOPO4 crystal pumped with an 120 mW extended-cavity diode laser. Ionization is then attained with a high-power light emitting diode imaged to the trap center, using an appropriately designed optical system composed of standard achromatic doublet lenses. The setup simplifies previous implementations at similar efficiency, and it hardly requires any maintenance at all.

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Schuck, C., Almendros, M., Rohde, F. et al. Two-color photoionization of calcium using SHG and LED light. Appl. Phys. B 100, 765–771 (2010). https://doi.org/10.1007/s00340-010-4086-7

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  • DOI: https://doi.org/10.1007/s00340-010-4086-7

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