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2003 Metrologia 40 84-88 doi: 10.1088/0026-1394/40/2/313
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Abstract. The frequency of a helium–neon laser stabilized to the hyperfine component f (alternatively denoted a16) of the 127I2 11-5 R(127) line at 633 nm has been measured with respect to the SI second using a femtosecond optical frequency comb generator based on a mode-locked Ti : sapphire laser and microstructure fibre. The standard uncertainty of this measurement is 0.6 kHz. The same laser was taken to BIPM mid-way through the measurements and its frequency compared to that of the BIPM's continuously maintained iodine-stabilized helium–neon laser BIPM-4. From this comparison, the frequency of BIPM-4 when stabilized to the same iodine hyperfine component f is 473 612 353 608.1 (0.7) kHz.
Print publication: Issue 2 (April 2003) |
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