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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Raman velocity selection of a three-level atom in a modulated light field

Dmitry V. Kosachiov, Yuri V. Rozhdestvenskii

Published May 6, 1996• 0 citations
Publisher

Abstract

The paper presents theoretical analysis of a Raman velocity selection of three-level atoms in a field of two counterpropagating light waves with time-modulated amplitudes. We demonstrate that in this case additional resonances appear in the atomic velocity distribution on the velocity values corresponding to the frequency of modulation. We have discussed a possible application of such coherent technique in atomic optics for efficient splitting of an atomic wave packet.

DOI
10.1117/12.239813

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The paper presents theoretical analysis of a Raman velocity selection of three-level atoms in a field of two counterpropagating light waves with time-modulated amplitudes. We demonstrate that in this case additional resonances appear in the atomic velocity distribution on the velocity values corresponding to the frequency of modulation. We have discussed a possible application of such coherent technique in atomic optics for efficient splitting of an atomic wave packet.
It is known [1-3], that the samples of atoms with a velocity spread much lower than the recoil velocity uR= ħk/M (k is the wave number of exciting light field, M is the mass of atom) can be obtained by use of velocity selection with stimulated Raman transitions. A theoretical analysis of the velocity selection method is presented in [2,3]. So, it was shown in [2] that the formation of such narrow velocity structures is performed not only by the counterpropagating, but also by co-propagating light waves. This fact allows to form the two-dimensional velocity distribution of the widths δvx,y « uR by the velocity selection technique using laser configuration as in Fig. 1b.
The wavefunction of a moderately cold atom in a stationary near-resonant standing light wave delocalizes very fast due to wave packet splitting. However, we show that frequency modulation of the field may suppress packet splitting for some atoms having specific velocities in a narrow range. These atoms remain localized in a small space for a long time. We propose that in a real experiment with cold atomic gas this effect may decrease the velocity distribution of atoms (the field traps the atoms with such specific velocities while all other atoms leave the field).
The wave function of a moderately cold atom in a stationary near-resonant standing light wave delocalizes very fast due to wave packet splitting. However, we show that frequency modulation of the field may suppress packet splitting for some atoms having specific velocities in a narrow range. These atoms remain localized in a small space for a long time. We propose that in a real experiment with cold atomic gas this effect may decrease the velocity distribution of atoms (the field traps the atoms with such specific velocities while all other atoms leave the field)