title: 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.
authors.affiliation: Los Alamos National Laboratory, P-23 Physics Division, MS H803, Los Alamos, NM 87545, USA.
authors.forename: T M
authors.initials: TM
authors.lastname: Fortier
authors.forename: Y Le
authors.initials: YL
authors.lastname: Coq
authors.forename: J E
authors.initials: JE
authors.lastname: Stalnaker
authors.forename: D
authors.initials: D
authors.lastname: Ortega
authors.forename: S A
authors.initials: SA
authors.lastname: Diddams
authors.forename: C W
authors.initials: CW
authors.lastname: Oates
authors.forename: L
authors.initials: L
authors.lastname: Hollberg