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Methods and apparatus for broadband frequency comb stabilization

United States Patent

March 17, 2015
View the Complete Patent at the US Patent & Trademark Office
Feedback loops can be used to shift and stabilize the carrier-envelope phase of a frequency comb from a mode-locked fibers laser or other optical source. Compared to other frequency shifting and stabilization techniques, feedback-based techniques provide a wideband closed-loop servo bandwidth without optical filtering, beam pointing errors, or group velocity dispersion. It also enables phase locking to a stable reference, such as a Ti:Sapphire laser, continuous-wave microwave or optical source, or self-referencing interferometer, e.g., to within 200 mrad rms from DC to 5 MHz. In addition, stabilized frequency combs can be coherently combined with other stable signals, including other stabilized frequency combs, to synthesize optical pulse trains with pulse durations of as little as a single optical cycle. Such a coherent combination can be achieved via orthogonal control, using balanced optical cross-correlation for timing stabilization and balanced homodyne detection for phase stabilization.
Cox; Jonathan A. (La Mesa, CA), Kaertner; Franz X. (Cambridge, MA)
Massachusetts Institute of Technology (MA)
14/ 196,442
March 4, 2014
GOVERNMENT SUPPORT This invention was supported, in whole or in part, by Department of Energy grant DE-SC0005262 and Air Force Office of Scientific Research grant FA9550-10-1-0063. The Government has certain rights in this invention.