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Supercontinuum generation in dispersion engineered silicon nitride waveguides is used to perform frequency comb metrology by measuring the relative stability of two cavity-referenced optical clock lasers at 3.8×10−15 at τ = 2 seconds.
Using aluminum-nitride photonic-chip waveguides, we generate optical frequency comb supercontinuum spanning 500 to 4000 nm. We detect and stabilize the offset frequency of the compact laser comb oscillator directly using the waveguide output.