This article is cited in 4 papers

Laser frequency standards

Magic wavelengths near 800 nm for precision spectroscopy of an inner-shell transition in thulium atoms

D. O. Tregubov^a, A. A. Golovizin^a, E. S. Fedorova^ab, K. Yu. Khabarova^ab, V. N. Sorokin^ab, N. N. Kolachevsky<sup>ab

a</sup> P. N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow
^b International Center for Quantum Optics and Quantum Technologies (the Russian Quantum Center), Moscow, Skolkovo

Abstract: Differential dynamic polarisability of the inner-shell clock transition at a wavelength of 1.14 μm in the thulium atom is measured by the method of precision laser spectroscopy in the spectral range of 800–860 nm. Experimental data approximated by a theoretical model yield the probability of the transition at λ = 809.5 nm: A_809.5 = 460(70) s^-1. The values of two magic wavelengths are obtained experimentally, namely, λ_m1 = 807.727(18) nm and λ_m2 = 813.3(2) nm, the wavelength of λ_m1 being determined for the first time. Main parameters of an optical lattice at these wavelengths are compared and a conclusion is made that trapping thulium atoms in an optical lattice at λ_m2 is preferable for optical clock operation.

Keywords: polarisability, magic wavelength, optical clock, clock transition, ultra cold atoms, thulium.

Received: 16.09.2019
Revised: 27.09.2019

 English version: Quantum Electronics, 2019, 49:11, 1028–1031

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