Abstract

We demonstrate direct frequency-comb (FC) spectroscopy of the dipole-forbidden 4s2S1/23d2D5/2 transition in trapped Ca+40 ions using an unamplified FC laser. The excitation is detected with nearly 100% efficiency using a shelving scheme in combination with single-ion imaging. The method demonstrated here has the potential to reach hertz-level accuracy, if a hertz-level linewidth FC is used in combination with confinement in the Lamb–Dicke regime.

© 2011 Optical Society of America

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