Kilohertz-resolution spectroscopy of cold atoms with an optical frequency comb

Abstract

We have performed sub-Doppler spectroscopy on the narrow intercombination line of cold calcium atoms using the amplified output of a femtosecond laser frequency comb. Injection locking of a 657-nm diode laser with a femtosecond comb allows for two regimes of amplification, one in which many lines of the comb are amplified, and one where a single line is predominantly amplified. The output of the laser in both regimes was used to perform kilohertz-level spectroscopy. This experiment demonstrates the potential for high-resolution absolute-frequency spectroscopy over the entire spectrum of the frequency comb output using a single high-finesse optical reference cavity.

4 pages, 4 Figures

References in corpus (2)

• Direct excitation of the forbidden clock transition in neutral 174Yb atoms confined to an optical lattice
• Tapered semiconductor amplifiers for optical frequency combs in the near infrared

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• Quantum control of EIT dispersion via atomic tunneling in a double-well Bose-Einstein condensate
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