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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 17 — Aug. 18, 2008
  • pp: 13062–13069

A single-shot imaging magnetometer using cold atoms

Matthew L. Terraciano, Mark Bashkansky, and Fredrik K. Fatemi  »View Author Affiliations

Optics Express, Vol. 16, Issue 17, pp. 13062-13069 (2008)

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We demonstrate a technique for imaging magnetic fields using velocity-selective two-photon resonances in a cold atom cloud. Freely expanding 85Rb atoms released from a magneto-optical trap are exposed to a brief (≈1 ms), off-resonant, retro-reflected laser pulse in a lin-perp-lin configuration. Two-photon resonance between magnetic sublevels occurs only for atoms in narrow velocity classes dependent on the magnetic field strength. The momentum of resonant atoms is altered by the pulse, and this two-photon momentum change is easily visible after further ballistic expansion. When the momentum pulse is applied to an atom cloud with finite size, magnetic field variations across the sample result in position-dependent features in images of the expanded cloud. We demonstrate the technique by imaging magnetic field variations over ≈5 mm with ≈250µm spatial resolution.

© 2008 Optical Society of America

OCIS Codes
(020.7490) Atomic and molecular physics : Zeeman effect
(020.3320) Atomic and molecular physics : Laser cooling

ToC Category:
Atomic and Molecular Physics

Original Manuscript: June 30, 2008
Revised Manuscript: July 31, 2008
Manuscript Accepted: August 4, 2008
Published: August 11, 2008

Matthew L. Terraciano, Mark Bashkansky, and Fredrik K. Fatemi, "A single-shot imaging magnetometer using cold atoms," Opt. Express 16, 13062-13069 (2008)

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