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Series on archaeology and history of science in China

A Review of Research on Atomic Clock and Laser Cooling of Gas Atoms in SIOM

Yuzhu Wang

Published Jun 17, 2014• 0 citations
Publisher
DOI
10.1142/9789814518765_0018

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The optical lattice clock develops fast in recent years, and its stability and accuracy has already surpassed the microwave fountain clock and the optical clock based on ion trap. The mercury (Hg) lattice clock has the possibility to make a breakthrough in the limitation of blackbody radiation shift for strontium (Sr) and ytterbium (Yb) lattice clock, and reach the uncertainty in E-18 level at room temperature. For the purposes of laser cooling of mercury atoms and interrogating of the clock transition from1S0state to3P0state, a high-power cooling laser at 253.7 nm and an ultra-stable Hz-level linewidth laser at 265.6 nm are required, respectively. Here, we report our development of these laser sources for a neutral Hg lattice clock.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)•Jul 1, 2017•0 citations
Neutral mercury atom is one of good candidates of optical lattice clock. Due to its large atomic number, mercury atom is insensitive to black body radiation, which is the severe limitation for the development of optical clocks. However, the challenge of neutral mercury lattice clock is the requirement of high power deep-UV lasers, especially for both the cooling laser and the lattice laser. Here, we report the recent progress of neutral mercury lattice clock in SIOM, including the development for laser cooling of mercury atom and the cooling laser system with fiber laser amplifier. We have realized the magneto-optical trap of mercury atoms and measured the parameters of cold mercury atoms. A home-made external cavity diode laser works as a seed laser for a room temperature 1014.8 nm fiber laser amplifier. A new efficient frequency-doubling cavity from 1015 nm to 507 nm has been developed.
To realize a neutral mercury lattice clock, an experimental setup is in developing in SIOM. With two stable cooling lasers and a new vacuum system, an enhanced cold mercury atom source is implemented based on a two-dimensional magneto-optical trap (2D-MOT). By applying a hybrid frequency stabilization method and optimization of the 2D-MOT, about 1.3×106cold mercury atoms are obtained with a loading rate of 1.0×106atoms/s. And a high power injection-locked Ti:sapphire laser at 725 nm is developed for optical lattice at magic-wavelength.
The optical lattice clock develops fast in recent years, and its stability and accuracy has already surpassed the microwave fountain clock and the optical clock based on ion trap. The mercury (Hg) lattice clock has the possibility to make a breakthrough in the limitation of blackbody radiation shift for strontium (Sr) and ytterbium (Yb) lattice clock, and reach the uncertainty in E-18 level at room temperature. For the purposes of laser cooling of mercury atoms and interrogating of the clock transition from1S0state to3P0state, a high-power cooling laser at 253.7 nm and an ultra-stable Hz-level linewidth laser at 265.6 nm are required, respectively. Here, we report our development of these laser sources for a neutral Hg lattice clock.