A new interferometric measurement of the caesium D2 resonance line wavenumber has been performed. The source is a diode laser stabilized on the fluorescence light of a caesium beam. Its wave number is measured with an improved interferometric wavemeter (lambdameter). The σD2 wavenumber is determined with an accuracy of 3.5 × 10-8.
Muhammad Fayyaz Kashif, Mohd Hadri Hafiz Mokhtar, Nur Hidayah Azeman, Fazida Hanim Hashim, Norhana Arsad, Abdulfatah A. G. Abushagur, Ahmad Ashrif A. Bakar
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