1. Absolute frequency measurements and hyperfine structures of the molecular iodine transitions at 578 nm
- Author
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Kobayashi, Takumi, Akamatsu, Daisuke, Hosaka, Kazumoto, Inaba, Hajime, Okubo, Sho, Tanabe, Takehiko, Yasuda, Masami, Onae, Atsushi, and Hong, Feng-Lei
- Subjects
Physics - Atomic Physics ,Physics - Optics - Abstract
We report absolute frequency measurements of 81 hyperfine components of the rovibrational transitions of molecular iodine at 578 nm using the second harmonic generation of an 1156-nm external-cavity diode laser and a fiber-based optical frequency comb. The relative uncertainties of the measured absolute frequencies are typically $1.4\times10^{-11}$. Accurate hyperfine constants of four rovibrational transitions are obtained by fitting the measured hyperfine splittings to a four-term effective Hamiltonian including the electric quadrupole, spin-rotation, tensor spin-spin, and scalar spin-spin interactions. The observed transitions can be good frequency references at 578 nm, and are especially useful for research using atomic ytterbium since the transitions are close to the $^{1}S_{0}-^{3}P_{0}$ clock transition of ytterbium.
- Published
- 2016
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