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Free, publicly-accessible full text available February 15, 2025
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Free, publicly-accessible full text available June 15, 2024
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A novel optical frequency division technique, called regenerative harmonic injection locking, is used to transfer the timing stability of an optical frequency comb with a repetition rate in the millimeter wave range (
) to a chip-scale mode-locked laser with a repetition rate. By doing so, the 300 GHz optical frequency comb is optically divided by a factor of to 10 GHz. The stability of the mode-locked laser after regenerative harmonic injection locking is at 1 s with a trend. To facilitate optical frequency division, a coupled opto-electronic oscillator is implemented to assist the injection locking process. This technique is exceptionally power efficient, as it uses less than of optical power to achieve stable locking.