The high power per mode of a recently-developed 10 GHz femtosecond Ti:sapphire frequency comb permits nonlinear Doppler-free saturation spectroscopy in 87Rubidium with a single mode of the comb. We use this access to the natural linewidth of the Rubidium D2 line to effectively stabilize the optical frequencies of the comb with precision of 7 10-12 in 1 second of averaging. The repetition rate is stabilized to a microwave reference. The stability of the 10 GHz comb is characterized using optical heterodyne with an independent self-referenced 1 GHz comb. In addition, we present alternative stabilization approaches for high repetition rate frequency combs and evaluate their expected stabilities.
Citation: Physical Review A (Atomic, Molecular and Optical Physics)
Pub Type: Journals
femtosecond laser frequency comb, high repetition comb, saturation spectroscopy, stabilization