title: Accurate wavelength meter for cw lasers.
abstract: An accurate wavelength meter (wavemeter) for cw lasers has been developed. The wavemeter is a Michelson-type fringe-counting two-beam interferometer operated in vacuum. A multicoincidence fringe counting technique has also been developed by which fringe fractions are determined with an uncertainty of 1/500 of a fringe. The result of wavelength comparisons between 612- and 633-nm I2 stabilized He-Ne lasers showed good agreement with the value recommended by CIPM 1983. The discrepancy was <4 x 10(-10) and the standard deviation of the comparison was 4 x 10(-10).
authors.affiliation: National Research Laboratory of Metrology, 1-1-4 Umezono, Sakura-mura, Niiharigun, Ibaraki 305, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Ishikawa
authors.forename: N
authors.initials: N
authors.lastname: Ito
authors.forename: K
authors.initials: K
authors.lastname: Tanaka