Embleme Atom&NanoOpticsGroup


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Atom Femto Trap

 Atom Femto Trap TheoryAtom Femto Trap Setup


A single atom “at rest” is an ideal physical object for many fundamental and applied investigations. A good approximation is an atom that is cooled by laser light and localized in a trap. However, a potential localizing the atom provides an perturbing effect on both external and internal degrees of freedom of the atom. The best situation is the cooling of the atom to a temperature corresponding to the energy of the atomic ground state, where the atom occupies the minimum phase space. Although the spatial motion of the atom is minimal in the ground state, this motion affects the internal degrees of freedom. Most fundamental and applied investigations are focused on the internal degrees of freedom. We propose and investigate approach to the minimization of the effect of the localizing field on the atom – Atom Femto Trap. Its essence is the use of the short-term and time-periodic action of the laser field on the spatial motion of a very slow atom. In such a scheme, the atom is free of the perturbing effect of the localizing field for a time interval (1 – tp / T ), where tp is the duration of the action and T is its repetition period. When femto second pulses are used, the relative time interval during which the atom is situated in the localizing field may be very short, i.e., 10 -7 -10 -6 , i.e., the atom is almost at rest. The atomic dynamics in a three-dimensional pulsed optical dipole trap is considered in detail. It covers all key features of the atomic dynamics in the trap, including the dipole-dipole interaction between trapped atoms due to the exchange of virtual photons between the atoms and the chaotic behavior. Analytical solutions are obtained for the relaxation and laser Liouvillians, which describe the dissipation and laser excitation in the system, respectively.




Institute for spectroscopy RAS, Fizicheskaya Str., 5, Troitsk, Moscow, 142190 Russia

phone: +7 495 851-02-33

e-mail: atom.nano.optics@gmail.com