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
)
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Calibrating a laser interferometer
Example of an uncertainty calculation
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