Realisation of a lambdameter

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Abstract
A double Michelson interferometer is used to compare an unknown wavelength of a continuous laser with a known wavelength of a reference laser (helium-neon stabilized) on the saturated absorption line of iodine at 6328 AA. The system is built so that the path difference is identical for each of the two beams. The corner cube moves vertically in a curve in a vacuum. The moving corner cube, controlled by microprocessor, is accelerated and retarded in the extreme phases of the movement. In these two phases all the useful measurements are stored. A polynomial interpolation enables determination of the starting and finishing points of initial and final instants.

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