Comparison of the 127I2-Stabilized He-Ne Lasers at 633 nm Wavelength of the Czechoslovak Institute of Metrology and the Bureau International des Poids et Mesures

Abstract

The results of a comparison between iodine-stabilized He-Ne lasers of the CSMU and of the BIPM are presented. A successive-difference two-probe standard deviation ⟨ σ2 (2, τ) ⟩1/2 of 1 × 10-12 at τ = 100 s and a mean frequency difference between the CSMU lasers and the BIPM laser of about 10 kHz (2 × 10-11) with a standard deviation of 2.0 kHz have been obtained. The linear coefficients of the modulation and pressure shifts correspond to published values. The frequency differences between fourteen iodine hyperfine structure components have been determined.