Abstract
We have developed and characterized a pair of Doppler-free acetylene-stabilized diode laser frequency standards as optical communications references. The Allan deviation of an individual system reaches a minimum of 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 . Using a combination of a frequency chain and a self-referenced femtosecond comb, we have measured the frequency of line of the overtone band of 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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