Nanooptics and photonics

Momentum diffusion of atoms in the counter-propagating stochastic light waves
V.I. Romanenko, L.P. Yatsenko
Coherent and Quantum Optics Department, Institute of Physics, Natl. Acad.. of Sci. of Ukraine. Prospect Nauki, 46, Kiev-03039, Ukraine.
E-mail: yatsenko@iop.kiev.ua.

Investigation of the light pressure force exerted on atoms in the field of the laser radiation are going on during more then four decades. Now it is well known that the light pressure force on atoms are substantially enhanced in the field of the counter-propagating light waves in comparison with the case of one traveling wave provided the time shift between the waves are properly chosen. The waves may have stochastic envelopes, as in papers [1,2]. Besides the light pressure force, we study the momentum diffusion of atoms in the field of the stochastic laser radiation which leads to the spreading of the momentum distribution, as shown in Fig.1.

Fig. 1. Examples of the dependence of the average velocity (a) and r.m.s. deviation of the velocity from its average values (b) on time for 10000 Cesium atoms. Rabi frequency of each wave is 60 MHz, initial velocity is 0.5 m/s. Time shift between the waves is 2.3 ns. The curves are marked with the values of inverse correlation time in MHz. 
The research was supported by NASU  (grant Vts-188).

1.	Romanenko V. I., Shore B. W., Yatsenko L. P.  Forces exerted on atoms by stochastic laser fields // Opt. Commun. -2006.-268.-P. 121-132.
2.	Romanenko V. I., Yatsenko L. P. Trapping of atoms by the counter-propagating stochastic light waves// Opt. Commun.-2017.-392. -P. 239-246.