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Article | REF: R1320 V1

Dimensional measurements using laser interferometry

Author: Geneviève LIPINSKI

Publication date: July 10, 1995

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5. Calibrating a laser interferometer

5.1 Wavelength calibration in vacuum

The frequency (or wavelength in vacuum) of a laser is measured by comparing it with that of a reference laser, using the beat or heterodyning method.

The reference laser is a helium-neon laser slaved to an iodine peak. Its short-term stability is 10 –12 . Its reproducibility is of the order of 10 –10 . A highly complex measurement chain at the Laboratoire Primaire des Temps et Fréquences links it to the atomic clock (stability 10 –13 ) [2] (figure

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Calibrating a laser interferometer
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