LaserLaB Amsterdam (Institute for Lasers, Life and Biophotonics) Amsterdam, VU University De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.
Opt Lett. 2011 Jan 1;36(1):49-51. doi: 10.1364/OL.36.000049.
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.
我们展示了使用未经放大的频率梳激光，对囚禁（40）Ca（+）离子中禁止的偶极 4s(2)S(1/2)-3d(2)D(5/2)跃迁进行直接频率梳光谱学研究。通过 shelving 方案结合单离子成像，以近 100%的效率检测到激发。如果使用线宽为赫兹级的频率梳，并结合兰姆-迪克区的限制，该方法具有达到赫兹级精度的潜力。
