Absolute-frequency measurement of the iodine-based length standard at 514.67 nm

R. J. Jones, W. Y. Cheng, K. W. Holman, L. Chen, J. L. Hall, J. Ye

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


The absolute frequency of the length standard at 514.67 nm based on the molecular iodine (127I2) transition of the P(13) 43-0 component a3 is measured using a self-referenced femtosecond optical comb. This frequency-based technique improves measurement precision more than 100 times compared with previous wavelength-based results. Power- and pressure-related frequency shifts have been carefully studied. The measured absolute frequency is 71.8 ± 1.5 kHz higher than the internationally accepted value of 582 490 603.37 ± 0.15 MHz, adopted by the Comité International des Poids et Mesures (CIPM) in 1997.

Original languageEnglish (US)
Pages (from-to)597-601
Number of pages5
JournalApplied Physics B: Lasers and Optics
Issue number6
StatePublished - Apr 2002

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)


Dive into the research topics of 'Absolute-frequency measurement of the iodine-based length standard at 514.67 nm'. Together they form a unique fingerprint.

Cite this