Adiabatic Passage Based on the Calcium Active Optical Clock

Tatiana Nazarova, C. Degenhardt, Christian Lisdat +3 more

Martina Knoop, Mustapha Said Herbane, M. Houssin +2 more

Nicolas Sangouard, X. Lacour, S. Guérin +1 more

Xiaopeng Xie, Wei Zhuang, Jingbiao Chen

We propose a new application of the optical adiabatic passage effect for the excitation of a thermal atomic beam, which will be used in the calcium active optical clock to produce population inversion. A comparison between the optical adiabatic passage effect and the Rabi π pulse is investigated, 99% of the calcium atoms in the atomic beam that has a wide velocity distribution will be excited to the upper state for population inversion using the adiabatic passage, while 76% at most will be excited to the excited state using the π pulse with suitable parameters.

Sergey Zhdanovich, E. A. Shapiro, Cian Menzel-Jones +3 more

Xiaobo Xue, Duo Pan, Xiaogang Zhang +2 more

An active optical clock can provide laser light source with potential much narrower linewidth than that of conventional cavity stabilized laser for optical clocks since many cavity noises, including the Brownian thermal noise, can be reduced by orders of magnitude. In this report, a scheme of active optical clock based on Sr atomic beam is proposed. The experimental work of population inversion has been done. A 689 nm laser is used to realize the population inversion between (5s5p)3P1state and (5s2)1S0state by the method of adiabatic rapid passage. A pumping rate of 59% is obtained. In order to establish the population inversion more effectively, an experimental scheme is proposed with a 483 nm pumping laser. A 687 nm laser is used for verification of pumping effectiveness. The atoms left in ground state after 689 nm laser and 687 nm laser pumping is about 7%, which may mainly result from87Sr isotope.