Abstract
By using a self-reference transfer oscillator method, two individual 1560 nm lasers with about 1.2 GHz frequency difference were phase locked to a 729 nm ultra-stable laser at two preset ratios. By measuring the beat frequency of the two 1560 nm lasers, fractional instabilities of 2×10−17 at 1 s and 2×10−20 at 10,000 s averaging time were obtained, and the relative offset compared with the theoretical value was 4.2×10−21±4.5×10−20. The frequency ratio of them was evaluated to a level of 1.3×10−20 in one day’s data acquisition. This work was a preparation for remote comparison of optical clocks through optical fiber links. The technique can also be used to synthesize ultra-stable lasers at other wavelengths.
© 2022 Chinese Laser Press
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