Direct frequency-comb spectroscopy of a dipole-forbidden clock transition in trapped 40Ca+ ions |
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| Authors: | Wolf Anne Lisa Morgenweg Jonas Koelemeij Jeroen C J van den Berg Steven A Ubachs Wim Eikema Kjeld S E |
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| Affiliation: | LaserLaB Amsterdam (Institute for Lasers, Life and Biophotonics) Amsterdam, VU University De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands. |
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| Abstract: | We demonstrate direct frequency-comb (FC) spectroscopy of the dipole-forbidden 4s(2)S(1/2)-3d(2)D(5/2) transition in trapped (40)Ca(+) 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. |
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