The ^171 Yb optical lattice clock project in BGU

by Mr. Yosef Bivas

Ben-Gurion University Of The Negev
at Quantum optics seminar

Wed, 09 Jun 2021, 15:00


Zoom link:

Student seminar!

Abstract: Optical frequency atomic clocks are the most precise measurement devices built to date. At present, optical clocks reach instabilities in the range of 10^(-16) in 1 sec averaging time and uncertainties on the order of 10^(-18). The performance of optical clocks surpasses the traditional microwave clocks and will lead to a new definition of the SI second standard in the future. In BGU we are in advanced stages of building an 171Yb atom optical clock. The 171Yb has very narrow forbidden optical transitions which are suitable to be used as a frequency reference. Here the isolated atoms are held in an optical lattice trap (light standing wave) for long interrogation times. State-of-the-art lasers and electro-optics are being used to achieve cutting edge clock performance. For example, a sub-Hz linewidth laser is being employed to probe the atoms, and a frequency comb will be used to transform optical frequencies to frequencies of electronic devices (Nobel prize 2005) without degradation of the optical stability and accuracy. In addition, home-made devices developed by us (like SHG bow-tie cavity, Zeeman-slower and UHV chambers system) are implemented for the various operations in the clock sequence. This clock is expected to be a center for time keeping in Israel (as the GPS becomes less reliable) and also serve for the development of new laser and optical techniques. Finally, as the optical frequency atomic clock is the most accurate machine ever built by human-kind, it will be used to probe the very foundations of science such as quantum theory and general relativity, as well as a tool in searches for dark matter, dark energy and new forces.

Created on 06-06-2021 by Folman, Ron (folman)
Updaded on 06-06-2021 by Folman, Ron (folman)