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Nonlinear beam shaping by a cloud of cold Rb atoms

Nonlinear beam shaping by a cloud of cold Rb atoms
Nonlinear beam shaping by a cloud of cold Rb atoms
First experimental investigations are reported on nonlinear beam shaping due to the interaction between an intense laser beam and a cloud of laser cooled rubidium atoms. Resonant excitation of the F = 3 <-> F'= 4 hyperfine transition is considered. The single-pass interaction through the cold vapor causes an increase in the laser beam intensity in the forward direction (zero transverse wavevector component) when observed in Fourier space, for sufficiently high values of saturation. A qualitative explanation of the observations based on a two-level model for a resonantly excited transition proves acceptable. The observations are compatible with an interpretation based on nonlinear index-induced focusing of an incident beam with curved wavefront, as is used in z-scan measurements. Simple physical considerations allow us to deduce the conditions for the observability of optical patterns in the beam transmitted by a cold atomic cloud.
1434-6060
473-483
Labeyrie, G.
29a45ac9-314b-4cec-a830-f1521ca7d585
Ackemann, T.
86f035db-1d87-45b2-87dd-4edd8d3ac96f
Klappauf, B.
74f447a9-de1a-47f3-810e-f67f72eb0ad1
Pesch, M.
10459ede-10cf-43ed-9a71-c3de1710c64d
Lippi, G.L.
de48876d-d99c-463c-8a58-aec29221d9f5
Kaiser, R.
28c00aa3-bd9c-4224-8fc4-acc15ec04dca
Labeyrie, G.
29a45ac9-314b-4cec-a830-f1521ca7d585
Ackemann, T.
86f035db-1d87-45b2-87dd-4edd8d3ac96f
Klappauf, B.
74f447a9-de1a-47f3-810e-f67f72eb0ad1
Pesch, M.
10459ede-10cf-43ed-9a71-c3de1710c64d
Lippi, G.L.
de48876d-d99c-463c-8a58-aec29221d9f5
Kaiser, R.
28c00aa3-bd9c-4224-8fc4-acc15ec04dca

Labeyrie, G., Ackemann, T., Klappauf, B., Pesch, M., Lippi, G.L. and Kaiser, R. (2003) Nonlinear beam shaping by a cloud of cold Rb atoms. The European Physical Journal D, 22 (3), 473-483. (doi:10.1140/epjd/e2003-00046-4).

Record type: Article

Abstract

First experimental investigations are reported on nonlinear beam shaping due to the interaction between an intense laser beam and a cloud of laser cooled rubidium atoms. Resonant excitation of the F = 3 <-> F'= 4 hyperfine transition is considered. The single-pass interaction through the cold vapor causes an increase in the laser beam intensity in the forward direction (zero transverse wavevector component) when observed in Fourier space, for sufficiently high values of saturation. A qualitative explanation of the observations based on a two-level model for a resonantly excited transition proves acceptable. The observations are compatible with an interpretation based on nonlinear index-induced focusing of an incident beam with curved wavefront, as is used in z-scan measurements. Simple physical considerations allow us to deduce the conditions for the observability of optical patterns in the beam transmitted by a cold atomic cloud.

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Published date: 2003

Identifiers

Local EPrints ID: 13821
URI: http://eprints.soton.ac.uk/id/eprint/13821
ISSN: 1434-6060
PURE UUID: 010d458f-d575-4f94-b2f8-798ac8506d17

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Date deposited: 18 Jan 2005
Last modified: 08 Jan 2022 00:58

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Contributors

Author: G. Labeyrie
Author: T. Ackemann
Author: B. Klappauf
Author: M. Pesch
Author: G.L. Lippi
Author: R. Kaiser

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