Abstract

Two octave-spanning optical-frequency combs (750-MHz comb spacing) are phase locked to a common continuous-wave laser diode. The measured instability of the heterodyne beat between the two combs demonstrates that the intrinsic fractional frequency noise of a comb is 6.3×10-16 in 1 s of averaging across the 300THz bandwidth. Furthermore, the average frequencies of the elements of the two combs are found to agree within an uncertainty of 4×10-17 across the entire octave. We demonstrate the possibility of transfering the stability and accuracy of the best current optical standards to 500,000 individual oscillators across the visible and near-infrared spectrum.

© 2002 Optical Society of America

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