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A transfer standard of the Mètre: an air wavelength reference

Published online by Cambridge University Press:  15 December 2001

R. Thibout
Affiliation:
BNM-INM/CNAM (For further information, please contact: juncar@cnam.fr), 292 rue Saint-Martin, 75003 Paris, France
S. Topçu*
Affiliation:
Laboratoire Roberval, UTC (UMR 6066), BP 60649, 60200 Compiègne, France
Y. Alayli
Affiliation:
Laboratoire Roberval, UTC (UMR 6066), BP 60649, 60200 Compiègne, France Laboratoire CISTEC, UVSQ, 45 avenue des États-Unis, 78035 Versailles, France
P. Juncar
Affiliation:
BNM-INM/CNAM (For further information, please contact: juncar@cnam.fr), 292 rue Saint-Martin, 75003 Paris, France
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Abstract

This paper presents the principle of an air wavelength standardfor high accuracy length metrology. According to the definition ofthe Mètre, nanometric accuracy by interferometric measurementtechniques can be reached only for measurements made under vacuumor by taking into account the fluctuations of the refractive indexof air. We have developed a new type of laser source whosewavelength is insensitive to slow fluctuations of the refractiveindex of air. The sensitivity of our air wavelength standard tosome characteristics (such as temperature, pressure, ageingbehaviour...) has been measured. Results show that the relativeuncertainty level of the wavelength of our source is below 10−8.

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Type
Research Article
Copyright
© EDP Sciences, 2001

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