Comparison between the127I2Stabilized He-Ne Lasers at 633 nm and 612 nm of the BIPM and the IMGC

Abstract

In November 1981, a comparison between BIPM and IMGC He-Ne lasers stabilized to saturated absorption lines of ¹²⁷I₂, at the wavelengths λ = 633 nm and λ = 612 nm has been made at the BIPM. At 633 nm, a repeatability and a reproducibility within +1 × 10^-11 · ν have been obtained. At 612 nm, a repeatability within a few 10^-11 · ν only for one laser and a reproducibility of ± 2 × 10^-10 · ν have been obtained.