Digital processing of beat note signals from optical frequency synthesizers

The presented work is focused on digital processing of beat note signals from a femtosecond optical frequency comb. The efforts concentrate in two main areas: Firstly, using digital servo-loop techniques for locking free running continuous laser sources on single components of the fs comb spectrum. Secondly, we are experimenting with digital signal processing of the RF beat note spectrum produced by f-2f technique used for assessing the offset and repetition frequencies of the comb, resulting in digital servo-loop stabilization of the fs comb.