Absolute frequency measurement of a 1.5-microm acetylene standard by use of a combined frequency chain and femtosecond comb |
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Authors: | Edwards Christopher S Margolis Helen S Barwood Geoffrey P Lea Stephen N Gill Patrick Huang Guilong Rowley William R C |
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Affiliation: | National Physical Laboratory, Queens Road, Teddington, Middlesex TW11 0LW, UK. christopher.edwards@npl.co.uk |
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Abstract: | We have developed and characterized a pair of Doppler-free acetylene-stabilized diode laser frequency standards as optical communications references. The Allan deviation sigma/f of an individual system reaches a minimum of 4 x 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 x 10(-12). Using a combination of a frequency chain and a self-referenced femtosecond comb, we have measured the frequency of line P(16) of the v1 + v3 overtone band of 13C2H2 to be 194,369,569,385.9 (3.0) kHz. The uncertainty of this number is limited solely by the reproducibility of the standards. |
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