Absolute frequency measurements for hyperfine structure determination of the R(26) 62-0 transition at 501.7 nm in molecular iodine

Andrei Goncharov (1, 2) , Olivier Lopez (2) , Anne Amy-Klein (2) , Frédéric Du Burck (2)

1 ILP - Institute of Laser Physics of SB RAS
2 LPL - Laboratoire de Physique des Lasers

The absolute frequencies of the hyperfine components of the R(26) 62-0 transition in molecular iodine at 501.7 nm are measured for the first time with an optical clockwork based on a femtosecond laser frequency comb generator. The set-up is composed of an Ar+ laser locked to a hyperfine component of the R(26) 62-0 transition detected in a continuously pumped low-pressure cell (0.33 Pa). The detected resonances show a linewidth of 45 kHz (half-width at half-maximum). The uncertainty of the frequency measurement is estimated to be 250 Hz.

Mots clés: iodine spectroscopy; hyperfine interaction; optical frequency measurement; femtosecond comb

Domaines: Physique Atomique [physics.atom-ph]; Physique Quantique [quant-ph]

Andrei Goncharov, Olivier Lopez, Anne Amy-Klein, Frédéric Du Burck. Absolute frequency measurements for hyperfine structure determination of the R(26) 62-0 transition at 501.7 nm in molecular iodine. Metrologia, 2007, 44, pp.275-278. ⟨hal-00157891⟩