In Embodiment 7, the subject matter of Embodiment 6 optionally includes a beat generator to use a single comb tooth of the optical frequency comb and a frequency stabilized laser to provide the first signal.

In Embodiment 8, the subject matter of any one or more of Embodiments 1-7 optionally include wherein the comb error measurement circuitry, the repetition rate control circuitry, and the carrier envelope offset control circuitry are implemented in a single field-programmable gate array.

Embodiment 9 includes a method for locking an optical frequency comb comprising: receiving, using error measurement and control circuitry, a first signal comprising a beat tone and a carrier envelope offset corresponding to the optical frequency comb and a second signal comprising the carrier envelope offset; determining, using comb error measurement circuitry and the first and second signal, a beat tone error and a carrier envelope offset error; providing, using repetition rate control circuitry and the beat tone error, a fast repetition rate control and a slow repetition rate control for locking the beat tone of the optical frequency comb; and providing, using carrier envelope offset control circuitry and the carrier envelope offset error, a fast repetition rate control and a slow repetition rate control for locking the carrier envelope offset of the optical frequency comb.