Abstract

We have developed and characterized a pair of Doppler-free acetylene-stabilized diode laser frequency standards as optical communications references. The Allan deviation σ/f of an individual system reaches a minimum of 4×10-14 at a sampling time of 5000 s, and the long-term lock-point repeatability is found to be 0.4 kHz (one standard uncertainty), corresponding to a fractional uncertainty of 2×10-12. Using a combination of a frequency chain and a self-referenced femtosecond comb, we have measured the frequency of line P16 of the ν1+ν3 overtone band of C132H2 to be 194 369 569 385.9 (3.0) kHz. The uncertainty of this number is limited solely by the reproducibility of the standards.

© 2004 Optical Society of America

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