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Absolute frequency measurement of molecular iodine lines at 514.7 nm, interrogated by a frequency-doubled Yb-doped fibre laser

Jean-Pierre Wallerand1, Lennart Robertsson2, Long-Sheng Ma2,3 and Massimo Zucco2,4

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The frequency of several hyperfine components of 127I2 has been measured at 514.67 nm using an optical frequency comb. Among them, the a3 component of the P(13)43-0 transition is recommended by the CIPM for the practical realization of the definition of the metre. The result is consistent with other measurements of the same line within 1.5 kHz of uncertainty, when the collisional shift is taken into account. A frequency-doubled distributed feedback fibre laser has been developed to carry out these measurements.


PACS

06.30.Ft Time and frequency

42.55.Wd Fiber lasers

33.70.Jg Line and band widths, shapes, and shifts

33.20.Ea Infrared spectra

33.15.Pw Fine and hyperfine structure

Subjects

Atomic and molecular physics

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 3 (June 2006)

Received 12 December 2005

Published 30 May 2006



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