Applied Physics B
The absolute frequency of the length standard at 514.67 nm based on the molecular iodine (127I 2) 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 582490603.37±0.15 MHz, adopted by the Comité International des Poids et Mesures (CIPM) in 1997.
Jones, R. J.; Cheng, Wang-Yau; Holman, K. W.; Chen, Lisheng; Hall, John L.; and Ye, Jun, "Absolute-Frequency Measurement of the Iodine-Based Length Standard at 514.67 nm" (2002). Physics Faculty Contributions. 69.