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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 Wallerand et al 2006 Metrologia 43 294-298   doi: 10.1088/0026-1394/43/3/012  Help

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Jean-Pierre Wallerand1, Lennart Robertsson2, Long-Sheng Ma2,3 and Massimo Zucco2,4
1 LNE-INM/CNAM, 61 rue du Landy, 93210 La Plaine Saint Denis, France
2 BIPM, Pavillon de Breteuil, 92312 Sèvres Cedex, France
3 On leave from Key Laboratory of Optical and Magnetic Resonance Spectroscopy, East China Normal University, Shanghai, 200062, China.
4 Also at Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, 10135, Torino, Italy.
E-mail: jpw@cnam.fr

Abstract. 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.

Print publication: Issue 3 (June 2006)
Received 12 December 2005
Published 30 May 2006

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