Naslov
Towards the first strontium optical atomic clock in Croatia

Autori
I. Puljić, A. Cipriš, D. Aumiler, T. Ban, N. Šantić

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, ostalo, znanstveni

Skup
Quantum mixtures with ultra-cold atoms school

Mjesto i datum
Varenna, Italija, 18.-23.07.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
strontium atoms, optical atomic clock, absolute frequency, 461nm transition, stability

Sažetak
Strontium atoms are often used in optical atomic clocks, with current state-ofthe-art clocks reaching a level of stability of 10^(−17)τ^(−1/2) and a level of accuracy bellow 10−18 [1]. To build the first strontium optical atomic clock in Croatia, among other things, we have to stabilize our lasers. The red cooling laser (689 nm), clock laser (698 nm), and repumper lasers (679 nm and 707 nm) will be phase locked to an optical frequency comb, which is locked to a laser stabilized to an optical reference cavity. The blue cooling laser (461 nm) is locked to a saturated absorption spectroscopy signal obtained in a hot vapour of strontium atoms. This hot vapour is generated in a dispenser cell which we have developed and made. Despite its importance for strontium atomic clocks, the frequency of the blue cooling transition at 461 nm has not been measured with high precision [2]. A beat-note of the locked blue laser with an optical frequency comb has been made. By measuring this beat note, we can determine the absolute frequency of this transition in strontium and the stability of our laser stabilization scheme. References: [1] S. L. Campbell et al., Science 358, 90–94 (2017). [2] F. J. Sullivan, Univ. Pittsburgh Bull. 35, 1 (1938).

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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