https://doi.org/10.1140/epjd/s10053-021-00262-w
Regular Article - Atomic Physics
Expansion and compression of the momentum distribution of atoms in the field of the counter-propagating frequency-modulated waves
1
Institute of Physics of the National Academy of Sciences of Ukraine, 46, Nauky Ave., 03028, Kyiv, Ukraine
2
Kherson National Technical University, Berislavske shosse (Berislavske Highway), 24, 73008, Kherson, Ukraine
Received:
2
June
2021
Accepted:
2
September
2021
Published online:
22
September
2021
We simulate the acceleration of atoms by the counter-propagating frequency-modulated (FM) waves. We show that the standard deviation of the velocity of atoms has a non-monotonic time dependence, and explain this phenomenon. The momentum diffusion coefficient of atoms in the field of FM waves is estimated from the analogy with the behaviour of atoms in the field of counter-propagating 
-pulses. If the parameters of the atom–field interaction are optimal, the momentum diffusion coefficient linearly depends on light intensity. We obtain our results with the use of the Monte Carlo wave-function method and compare them with the results obtained by the solution of the optical Bloch equations. We compare our results with the behaviour of atoms in the field of the counter-propagating bichromatic waves.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2021
