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The uncertainty of a wavemeter has been evaluated taking into account all contributions. This wavemeter was developed to give traceability to the frequency of external cavity diode lasers. These lasers were stabilized and used as light source in the assembly of a new interferometric system for the gauge block calibration.The wavemeter experimental setup is also presented and is based in a Michelson interferometer, a He-Ne laser used as a reference wavelength and a Vernier counter that allowed us to reduce the uncertainty below 1ppm.

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