$λ/4$, $λ/8$, and higher order atom gratings via Raman transitions

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dc.creatorDubetsky, B.
dc.creatorBerman, P. R.
dc.date2002-01-09
dc.date2002-02-04
dc.date.accessioned2026-07-07T05:46:57Z
dc.date.available2026-07-07T05:46:57Z
dc.descriptionA method is proposed for producing atom gratings having period $λ/4$ and $λ/8$ using optical fields having wavelength $λ$. Counterpropagating optical fields drive Raman transitions between ground state sublevels. The Raman fields can be described by an effective two photon field having wave vector 2 k, where k is the propagation vector of one of the fields. By combining this Raman field with {\em another} Raman field having propagation vector -2 k, one, in effect, creates a standing wave Raman field \label{91}%which whose ``intensity'' varies as $\cos (4 k\cdot r).$ When atoms move through this standing wave field, atom gratings having period $λ/4$ are produced, with the added possibility that the total ground state population in a given ground state manifold can have $λ/8$ periodicity. The conditions required to produce such gratings are derived. Moreover, it is shown that even higher order gratings having periodicity smaller than $λ/8$ can be produced using a multicolor field geometry involving three (two-photon) Raman fields. Although most calculations are carried out in the Raman-Nath approximation, the use of Raman fields to create reduced period optical lattices is also discussed.
dc.description12 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/physics/0201017
dc.identifierhttp://arxiv.org/abs/physics/0201017
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/84530
dc.subjectAtomic Physics
dc.title$λ/4$, $λ/8$, and higher order atom gratings via Raman transitions
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