A low-cost digital FPGA servo locked the repetition rate and carrier-envelope offset of a commercial Er:fiber comb for 30 hours with phase noise comparable to manufacturer electronics.
Nobel lecture: Defining and measuring optical frequencies,
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A versatile digital approach to laser frequency comb stabilization
A low-cost digital FPGA servo locked the repetition rate and carrier-envelope offset of a commercial Er:fiber comb for 30 hours with phase noise comparable to manufacturer electronics.