Doppler-Free Spectroscopy of theS01−P03Optical Clock Transition in Laser-Cooled Fermionic Isotopes of Neutral Mercur

Abstract

We have performed for the first time direct laser spectroscopy of the 1 S 0 -3 P 0 optical clock transition at 265.6 nm in fermionic isotopes of neutral mercury laser-cooled in a magneto-optical trap. Spectroscopy is performed by measuring the depletion of the magneto-optical trap induced by the excitation of the long-lived 3 P 0 state by a probe at 265.6 nm. Measurements resolve the Doppler-free recoil doublet allowing for a determination of the transition frequency to an uncertainty well below the Doppler-broadened linewidth. We have performed absolute measurement of the frequency with respect to an ultra-stable reference monitored by LNE-SYRTE fountain primary frequency standards using a femtosecond laser frequency comb. The measured frequency is 1128575290808 ± 5.6 kHz in 199 Hg and 1128569561140 ± 5.3 kHz in 201 Hg, more than 4 orders of magnitude better than previous indirect determinations. Owing to a low sensitivity to blackbody radiation, mercury is a promising candidate for reaching the ultimate performance of optical lattice clocks.

Two-dimensional magneto-optical trap as a source for cold strontium atoms

“…A * jiangyh@sari.ac.cn † peng07@ustc.edu.cn ‡ weidemueller@uni-heidelberg.de large variety of vapor-cell 2D-MOT designs have been reported in literature. As an example, the vapor-cell variant of a 2D-MOT source is widely used as a loading source for, e.g., rubidium [26][27][28], cesium [25,29,30], potassium [31] or mercury [32,33] MOTs owing to the relatively high vapor pressure of these elements at room temperature.…”

Interference Effects in Hyperfine Induced 2s2p3P0,3P2→ 2s21S0Transitions of Be-like Ions

“…Hyperfine spectroscopy is very important tool in study of atomic and nuclear physics, especially which can be used to check fundamental interaction [1,2,3,4,5] such as electromagnetic and electroweak interaction with high accuracy, determine nuclear properties [6,7,8,9,10], develop atomic clock [11,12,13,14,15], and so on. Recently one kind of hyperfine transitions, which is known as hyperfine induced transition or hyperfine quenching, attracts more attention owing to analyzing spectra [16], determining isotopic ratios in stellar and diagnosing low-density plasma [17,18] besides those reasons mentioned above.…”

Horloge à réseau optique à atomes de mercure

“…La fréquence des pics du doublet de recul n'est pas affectée par l'effet Doppler et le centre du doublet de recul coïncide avec la fré-quence atomique non perturbée. Nous avons étudié les propriétés du doublet de recul en fonction des divers paramètres de la séquence d'interrogation et estimer les sources de déplacements de la fréquence de la transition [36]. Enfin, grâce à la connexion aux références primaires du LNE-SYRTE basées sur les fontaines atomiques, nous avons déterminé, pour les deux isotopes fermioniques, la fréquence absolue de la transition horloge : ν ( 199 Hg) = (1 128 575 290 808,4 ± 5,6) kHz et ν ( 201 Hg) = (1 128 569 561 139,6 ± 5,3) kHz.…”