Two Lu(+) optical frequency references achieve fractional uncertainties near 1×10⁻¹⁹, enabling precise comparison at the 5.7×10⁻¹⁹ level.
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Two Lu(+) optical frequency references achieve fractional uncertainties near 1×10⁻¹⁹, enabling precise comparison at the 5.7×10⁻¹⁹ level.
Self-aligned optical microcomb spanning an octave between two pumps enables stable, integrated frequency combs for precision applications.
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