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SmartComb the new ease - 5 Metrology Lasers, 3 Countries, 3 Days, 1 Comb

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SmartComb the new ease - 5 Metrology Lasers, 3 Countries, 3 Days, 1 Comb

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  • Author: Benjamin Sprenger, Martin Wolferstetter, Michael Matus, Roman Fira, Petr Balling
The definition of the meter has been realized via Iodine-stabilized Helium-Neon lasers over the past few decades [1]. NMIs worldwide use these lasers either directly in interferometric length measurements, or they are used to calibrate other commercial and cheaper lasers, such as Zeeman-stabilized Helium-Neon lasers. Several transitions in 127I2 (iodine) vapor overlap with the 1 GHz gain band of the Helium-Neon gas mixture, and preferably the a16 or “f ” component of the R(127) 11-5 transition is used to define the meter. Since this stabilized laser frequency can drift a few kHz over several months, it is necessary to have comparisons and calibrate the absolute value.

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