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Ultra-stable lasers and optical frequency combs have been the enablingtechnologies for the tremendous progress of precise optical spectroscopy in thelast ten years. To improve laser frequency stabilization beyond thethermal-noise fundamental limit of traditional room-temperature high-finesseoptical cavities, new solutions have been recently developed. These beingcomplex and often wavelength specific, the capability to transfer theirspectral purity to any optical wavelengths is highly desirable. Here we presentan optical frequency comb based scheme transferring a $4.5 \times 10^{-16}$fractional frequency stability from a 1062 nm wavelength laser to a 1542 nmlaser. We demonstrate that this scheme does not hinder the transfer down to $3\times 10^{-18}$ at one second, two orders of magnitude below previouslyreported work with comparable systems. This exceeds by more than one order ofmagnitude the stability of any optical oscillator demonstrated to date, andsatisfies the stability requirement for quantum-projection-noise limitedoptical lattice clocks.

Spectral purity transfer between optical wavelengths at the $10^{-18}$ level