Prof. Alfred Gazazyan Profile

Prof. Alfred Gazazyan

at Institute for Physical Research NAS Armenia

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Publications (2)

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Proceedings Article | 5 April 2011 Paper

Manipulating Feshbach resonances in collisions of atoms in laser radiation field

A. Gazazyan, E. Gazazyan, V. Chaltykyan

Proceedings Volume 7998, 79980Y (2011) https://doi.org/10.1117/12.890508

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Collisions of atoms with formation of Feshbach resonances in the presence of laser field are considered. The elastic and inelastic scattering cross sections are calculated. The laser field leads to second resonance in elastic scattering, broadening of resonances, and arising of interference between resonant and potential scattering. The effects associated with interference of the two channels of decay of bound system of two atoms (a molecule) in laser field are studied. It is shown that if the energy equals that of the lower stable Stark-shifted level plus the energy of two photons, the resonance is quenched. It is also shown that with the increase in two-photon effective interaction the pattern of resonance scattering changes essentially.

Proceedings Article | 5 April 2011 Paper

Coherent control of spontaneous emission in driven multilevel atoms

Emil Gazazyan, Vigen Chaltykyan, Alfred Gazazyan

Proceedings Volume 7998, 79980Z (2011) https://doi.org/10.1117/12.890509

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Possibility of coherent control of spontaneous emission from four- and five-level systems in the laser radiation field is studied. The four-level system consists of two levels resonantly driven by laser radiation where either of levels may decay to a separate level. For such a system we show that the presence of the second decay channel may deteriorate the destructive interference occurring because of Autler-Townes effect in case of one decay channel. The five-level system represents two two-level resonantly driven systems with the upper levels decaying to a common level. For this case, the interference between the two decay channels is partially or completely destructive or constructive depending on the initial conditions and on the mutual orientation of the transition dipole moments. It is shown that population transfer takes place by the same quantum vacuum via spontaneous emission. The populations are shown to have damping oscillatory nature.

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