A servo controlled Michelson interferometer with a displacement of 3.8 m between the final positions of the movable mirror has been developed for precise laser wavelength comparisons. This instrument has been used to determine the wavelength ratio between the radiation of a 3.39-µm He-Ne laser stabilized to the CH₄ transition ν₃, P(7), component F⁽²⁾₂ and that of a 633-nm He-Ne laser stabilized to the ¹²⁷I₂ transition 11-5, R(127), component i. Expanded laser beams of Gaussian structure were used and the diffraction correction for the infrared beam was determined from measured beam parameters. Two series of measurements were carried out, approximating measurements with the total cross section and with only the central part of the beam. The results confirm the expected change of the diffraction correction. The weighted mean value of both measurement series yields λCH₄/λ_I2 = 5.359 048 1743(1 ± 3 × 10^-10).

© 1983 Optical Society of America

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