Absolute frequency measurements of the 532 nm radiation recommended for the realization of the metre (original) (raw)

Abstract

Absolute frequency measurement at the International Bureau of Weights and Measures of an iodine-stabilized Nd:YAG laser with λ ≈ 532 nm is reported. The reference laser system Nd:YAG-C stabilized to the a10 component in the R(56) 32-0 line was measured using an optical femtosecond comb set-up. The frequency found was 563 260 223 510.4 kHz with a standard uncertainty of uc = 0.2 kHz. A simplified scheme was used in which the absolute frequency measurements were made possible while controlling only the repetition rate of the comb; this reduces the control of the frequency comb to a one-dimensional problem.

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